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UWE-12/20-Q12PC

型号：

UWE-12/20-Q12PC

品牌：

MURATA[ muRata ]

页数：

12 页

PDF大小：

1712 K

下载PDF手册
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
The UWE Series "Eighth-Brick" DC/DC Converters are high-current isolated  
power modules designed for use in high-density system boards.  
PRODUCT OVERVIEW  
With dimensions of only 0.9 by 2.3 by 0.36  
inches, the UWE series open frame DC/DC convert-  
ers deliver up to 75 Watts in an industry-standard  
“eighth-brick” through-hole package. This format  
can plug directly into quarter-brick pinouts. Several  
standard fixed-output voltages from 3.3 Vdc to 24  
Vdc assure compatibility in embedded equipment,  
tight line/load regulation, stable no-load operation  
and fast load step response. All units are precision  
assembled in a highly automated facility with ISO-  
traceable manufacturing quality standards.  
Isolation of 1500 Volts assures safety and fully  
differential (floating) operation for greatest applica-  
tion flexibility. On-board Sense inputs compensate  
Typical unit  
FEATURES  
nꢀ  
Industry-standard through-hole eighth-brick  
package with 0.9" x 2.3" x 0.36" outline  
dimensions  
CPU cards and instrument subsystems. The extend- for line drop errors at high output currents. Outputs  
ed 4-to-1 input power range (9-36V) is ideal for  
battery-powered, telecom or portable applications.  
Very high efficiency means no fans or temperature  
deratings in many applications. An optional thermal  
mounting baseplate extends operation into most  
conceivable environments.  
are trimmable within 10ꢀ of nominal voltage. The  
UWE series are functionally complete.  
nꢀ  
Choice of two wide input ranges, 9 - 36 Vdc or  
18-75 Vdc  
A wealth of protection features prevents damage  
to both the converter and outside circuits. Inputs  
are protected from undervoltage and outputs fea-  
ture short circuit protection, overcurrent and excess  
temperature shut down. Overloads automatically  
recover using the “hiccup” technique upon fault  
removal. The UWE is designed to meet all standard  
safety and EMI/RFI certifications. All units meet  
RoHS-6 (no lead) hazardous materials compliance.  
nꢀ  
Fixed output from 3.3 to 24 Volts DC up to  
75 Watts  
The synchronous rectifier design uses the  
nꢀ  
Synchronous rectification yields very high  
efficiency and low power dissipation  
maximum available duty cycle for greatest ef-  
ficiency and low power dissipation with no reverse  
output conduction. Other features include low  
on-resistance FET’s, planar magnetics and heavy-  
copper PC boards. These deliver low output noise,  
nꢀ  
Operating temperature range from -40 to  
+85˚C. with derating  
nꢀ  
Up to 1500 Volt DC isolation (basic insulation)  
nꢀ  
Outstanding thermal performance and  
derating  
nꢀ  
Extensive self-protection, overtemperature and  
overload features with no output reverse  
conduction  
+VOUT  
+VIN  
SWITCH  
DRIVE  
nꢀ  
On/Off control, trim and remote sense functions  
VOLTAGE  
REGULATOR  
nꢀ  
Designed to meet UL/EN/IEC 60950-1, CAN/  
CSA-C22.2 No. 60950-1 safety approvals  
and FCC RFI/EMI certification  
+SENSE  
nꢀ  
−VOUT  
Pre-bias operation for startup protection  
SS  
PWM  
–VIN  
−SENSE  
ON/OFF  
CONTROL  
REFERENCE  
AMPLIFIER,  
TRIM AND FEEDBACK  
ISOLATION  
TRIM  
UV, OT  
Typical topology is shown.  
Simplified Block Diagram  
For full details go to  
www.murata-ps.com/rohs  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 1 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
SPECIFICATION SUMMARY AND ORDERING GUIDE  
Output  
Input  
Iin, no  
Efficiency  
Iin, full  
load  
(A)  
R/N (mVp-p) ➂  
Regulation (max.)  
Vo u t  
(V)  
Io u t  
(A)  
Power  
(W)  
Vin Nom. Range  
load  
Package  
(Case, Pinout)  
Root Model  
UWE-3.3/20-Q12P-C  
UWE-3.3/20-Q48N-C  
UWE-5/15-Q12P-C  
UWE-5/15-Q48N-C  
UWE-12/6-Q12P-C  
UWE-12/6-Q48N-C  
UWE-24/3-Q12P-C  
Typ.  
Max.  
Line  
Load  
(V)  
(V)  
(mA)  
Min.  
Typ.  
3.3  
3.3  
20  
20  
15  
15  
6
66  
66  
75  
75  
72  
72  
72  
0.25ꢀ  
0.25ꢀ  
80  
125  
12  
9-36  
160  
6.18  
87ꢀ  
89ꢀ  
5.0  
Please contact Murata Power Solutions for further information.  
5.0  
C77, P32  
12.0  
12.0  
24.0  
120  
190  
180  
275  
0.125ꢀ  
0.05ꢀ  
12  
9-36  
75  
6.56  
90ꢀ  
91.5ꢀ  
89.5ꢀ  
6
Please contact Murata Power Solutions for further information.  
0.125ꢀ  
3
0.125ꢀ  
12  
9-36  
110  
6.70  
88.3ꢀ  
Please refer to the part number structure for additonal ordering model numbers and options.  
All specifications are at nominal line voltage, nominal output voltage and full load, +25° C.  
unless otherwise noted. See detailed specifications.  
I/O caps are necessary for our test equipment and may not be needed for your application.  
Load range: 0.1-3A. This is required only for our test equipment. The converter will operate at  
zero output current.  
Output capacitors are 1 µF ceramic || 10 µF electrolytic. Input cap is 100 µF. All caps are low  
ESR types. Contact Murata Power Solutions for details.  
PART NUMBER STRUCTURE  
U W E - 12 / 6 - Q12 P B - C  
Unipolar, Single-output  
RoHS Hazardous Materials Compliance  
C=RoHS-6, standard  
Wide Input Range  
Baseplate (optional)  
Blank = No baseplate (standard)  
B = Baseplate installed (optional special order)  
Eighth-Brick Package  
Nominal Output Voltage  
On/Off Control Polarity  
P = Positive polarity (standard for Q12 models)  
N = Negative polarity (optional special order for Q12 models)  
Input Voltage Range  
Note:  
Maximum Rated Output  
Current in Amps  
Q12 = 9-36 Volts  
Q48 = 18-75 Volts  
Some model number combinations may  
not be available. Contact Murata Power  
Solutions for further information.  
DETAIL SPECIFICATIONS, Q12 MODELS  
18  
UWE-3.3/20-Q12  
uWE-5/15-Q12  
UWE-12/6-Q12  
UWE-24/3-Q12  
Specs are typical unless noted.  
INPUT  
Input voltage range  
See ordering guide  
none  
Start-up threshold, Volts  
Undervoltage shutdown, V.  
Overvoltage shutdown, V.  
Reflected (back) ripple current, mA pk-pk  
Suggested external fuse, A  
Input current  
9.5  
8.5  
9
8
25  
25  
40  
20  
40  
20  
Full load conditions  
See ordering guide  
See ordering guide  
0.1 A2sec  
Inrush transient, A2sec  
Input current if output is in short circuit, mA  
No load, mA  
0.1 A2sec  
250  
250  
75  
250  
110  
9.04  
5
160  
Low line (Vin=min.), Amps  
Standby mode, mA  
8.33  
8
8.89  
5
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 2 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
DETAIL SPECIFICATIONS, CONTIUED  
INPUT (continued)  
UWE-3.3/20-Q12  
uWE-5/15-Q12  
UWE-12/6-Q12  
UWE-24/3-Q12  
(Off, UV, OT shutdown)  
Internal input filter type  
L-C  
Reverse polarity protection  
Remote On/Off control  
Yes  
Yes  
OFF=Ground pin to +0.8V max.  
ON=open pin or +3.5 to +Vin max.  
OFF=open pin or +5V to +Vin max.  
ON=Ground pin or 0 to +0.8V max.  
1
Positive logic ("P" model suffix)  
Negative logic ("N" model suffix)  
Current, mA  
OUTPUT  
Voltage output range  
Voltage output accuracy  
Adjustment range  
See ordering guide  
1ꢀ of Vnom., (50ꢀ load)  
-10 to +10ꢀ of Vnom.  
0.02ꢀ of Vout range per °C  
No minimum load  
Temperature coefficient  
Minimum loading  
Remote sense compensation  
Ripple/noise (20 MHz bandwidth)  
Line/Load regulation  
Efficiency  
+10ꢀ max.  
See ordering guide  
See ordering guide  
See ordering guide  
Maximum capacitive loading, μF  
low ESR <0.02Ω max., resistive load  
10,000  
4,700  
1500  
Isolation voltage  
Input to Output, Volts min. DC  
Input to baseplate, Volts min. DC  
Baseplate to output, Volts min. DC  
Isolation resistance, MΩ  
Isolation capacitance, pF  
Isolation safety rating  
1500  
1500  
750  
100  
1500  
27  
1000  
1000  
4.0  
Basic insulation  
Current limit inception (98% of  
Vout, after warmup), Amps  
8.5  
Short circuit protection method  
Short circuit current, Amps  
Short circuit duration  
Current limiting, hiccup autorestart. Remove overload for recovery.  
0.5  
4.5  
1.5  
1.0  
29  
Continuous, output shorted to ground. No damage.  
Overvoltage protection, Volts  
(via magnetic feedback)  
15  
DYNAMIC CHARACTERISTICS  
Dynamic load response, μSec  
(50-75-50% load step) to 1%  
of final value  
50  
Start-up time  
Vin to Vout regulated, mSec  
Remote On/Off to Vout regulated, mSec  
Switching frequency, KHz  
20  
5
40  
30  
40  
30  
245 25  
275 25  
215 15  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 3 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
DETAIL SPECIFICATIONS, CONTIUED  
ENVIRONMENTAL  
UWE-3.3/20-Q12  
uWE-5/15-Q12  
UWE-12/6-Q12  
UWE-24/3-Q12  
3,755,203 hours (UWE-12/6-Q12N-C)  
1,248,001 hours (UWE-3.3/20-Q12)  
Calculated MTBF (Telcordia SR-332)  
Calculated MTBF (MIL-HDBK-217N2)  
1,239,521 hours (UWE-12/6-Q12N-C)  
1,089,141 hours (UWE-3.3/20-Q12)  
Operating temperature range  
with derating, °C (see Derating curves)  
-40 to +85 with derating  
Storage temperature range, °C  
Thermal protection/shutdown, °C  
Relative humidity  
PHYSICAL  
-55 to +125  
+120  
to +85°C/85ꢀ non-condensing  
Outline dimensions  
Pin material  
See mechanical specs  
Copper alloy  
Pin Finish  
Nickel underplate with gold overplate (see mechanical specs for details)  
Pin diameter, inches  
Pin diameter, mm  
Weight, ounces  
0.04/0.062  
1.016/1.575  
0.7  
Weight, grams  
20  
Electromagnetic interference (conducted)  
Safety  
Designed to meet FCC part 15, class B, EN55022 conducted and CISPR22 class B conducted.  
Designed to meet UL/cUL 60950-1, CSA-C22.2 No.60950-1, IEC/EN 60950-1  
SPECIFICATION NOTES  
CAUTION: This product is not internally fused. To comply with safety agency cer-  
tifications and to avoid injury to personnel or equipment, the user must supply an  
external fast-blow fuse to the input terminals. See fuse information.  
All models are tested and specified with external 1µF and 10µF paralleled ceramic/  
tantalum output capacitors and a 100 µF external input capacitor. All capacitors are  
low ESR types. Contact Murata Power Solutions for details. These capacitors are  
necessary to accommodate our test equipment and may not be required to achieve  
specified performance in your applications. However, Murata Power Solutions  
recommends using these capacitors in your application. All models are stable and  
regulate within spec under no-load conditions.  
9
All models are fully operational and meet published specifications, including “cold  
start” at –40° C. At full power, the package temperature of all on-board components  
must not exceed +128° C.  
1
10 Regulation specifications describe the deviation as the line input voltage or output  
load current is varied from a nominal midpoint value to either extreme.  
11 If the user adjusts the output voltage, accuracy is dependent on user-supplied  
trim resistors. To achieve high accuracy, use 1ꢀ or better tolerance metal-film  
resistors. If no trim is installed, the converter will achieve its rated accuracy. Do not  
exceed maximum power specifications when adjusting the output trim.  
12 Output current limit and short circuit protection is non-latching. When the overcur-  
rent fault is removed, the converter will immediately recover.  
All specifications are typical unless noted. General conditions for Specifications are  
+25° C, Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied  
for extended testing under power.  
13 Alternate pin length and/or other output voltages may be available under special  
quantity order.  
2
3
Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input  
filtering is Cin=33 µF, Cbus=220 µF, Lbus=12 µH.  
14 At zero output current, the output may contain low frequency components which  
exceed the ripple specification. The output may be operated indefinitely with no  
load.  
Note that Maximum Power Derating curves indicate an average current at nominal  
input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will  
tolerate brief full current outputs if the total RMS current over time does not exceed  
the Derating curve. All Derating curves are presented at sea level altitude. Be aware  
that power dissipation degrades as altitude increases.  
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Issue  
1, Case 3, Fits 266, ground fixed conditions, Tambient = +30° C, full output load,  
natural air convection.  
The Remote On/Off Control is normally controlled by a switch or open collector or  
open drain transistor. But it may also be driven with external logic or by applying  
appropriate external voltages which are referenced to Input Common.  
Short circuit shutdown begins when the output voltage degrades approximately 2ꢀ  
from the selected setting.  
15 Input Fusing: To ensure reverse input protection with full output load, always con-  
nect an external input fast-blow fuse in series with the +Vin input. Use approxi-  
mately twice the full input current rating at the selected input voltage.  
16 “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a  
brief, full-current output. If the overcurrent condition still exists, the restart current  
will be removed and then tried again. This short current pulse prevents overheating  
and damaging the converter. Once the fault is removed, the converter immediately  
recovers normal operation.  
17 Note that the converter will operate up to the rated baseplate maximum tempera-  
ture with the baseplate installed and properly heat sunk. To avoid thermal self-  
protection shutdown, do not exceed this maximum baseplate temperature.  
18 UWE-24/3-Q12 undervoltage shutdown of 8.0V is at half load.  
19 UWE-24/3-Q12 output overvoltage protection requires 0.3A minimum load.  
20 Pre-bias operation: Startup will succeed if the output setpoint voltage is higher than  
the pre-existing external output voltage.  
4
5
6
7
8
The outputs are not intended to sink appreciable reverse current.  
Output noise may be further reduced by adding an external filter. See I/O Filtering  
and Noise Reduction. Larger caps (especially low-ESR ceramic capacitors) may  
slow transient response or degrade stability. Use only as much output filtering as  
needed to achieve your noise requirements and no more. Thoroughly test your  
system under full load with all components installed.  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 4 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
MECHANICAL SPECIFICATIONS—NO BASEPLATE  
2.30  
(58.4)  
TOP VIEW  
ISOMETRIC  
VIEW  
0.90 (22.9)  
.071±.002 STANDOFF  
AT EACH  
.040 PIN  
END VIEW  
SIDE VIEW  
0.21 (5.3) @  
.062 PINS  
0.38 (9.7)  
MAX  
MOUNTING PLANE  
.040±.002  
AT PINS 1-3, 5-7  
0.19 (4.8) @  
.040 PINS  
I/O CONNECTIONS  
.062±.002  
AT PINS 4 & 8  
Pin  
1
Function  
- Vin  
2
On/Off Control *  
+Vin  
3
0.15 (3.8)  
PIN 1  
2.000  
(50.8)  
4
5
6
7
8
- Vout  
- Sense  
Trim  
PIN 4  
PIN 5  
+ Sense  
+ Vout  
BOTTOM VIEW  
* The Remote On/Off can  
be provided with either  
positive (P suffix) or negative  
(N suffix) polarity  
.45  
.300  
.150  
.600  
REF  
.600  
.150  
Connect each sense input to its  
respective Vout if sense is not  
connected at a remote load.  
PIN 2  
PIN 3  
PIN 6  
PIN 7  
PIN 8  
Dimensions are in inches (mm shown for ref. only).  
MATERIAL:  
Third Angle Projection  
.040 PINS: C26000 BRASS, 3/4 HARD  
.062 PINS: C10200 COPPER ALLOY, FULL HARD  
FINISH: (ALL PINS)  
GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)  
Tolerances (unless otherwise specified):  
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)  
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)  
Angles 02  
Components are shown for reference only.  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 5 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
MECHANICAL SPECIFICATIONS (continued)—BASEPLATE INSTALLED  
4X THRU  
2.30  
(58.4)  
M2X0.4 - 6H  
.15" MAX SCREW  
PENETRATION  
TOP VIEW  
ISOMETRIC  
VIEW  
0.90 (22.9)  
.625  
.40  
1.500  
0.14 (3.6)  
.071±.002 STANDOFF  
AT EACH .040 PIN  
ALUMINUM  
BASEPLATE  
END VIEW  
SIDE VIEW  
0.21 (5.3) @  
.062 PINS  
0.50 (12.7)  
MOUNTING PLANE  
.040±.002  
AT PINS 1-3, 5-7  
0.19 (4.8) @  
.040 PINS  
.062±.002  
AT PINS 4 & 8  
0.15 (3.8)  
PIN 1  
2.000  
(50.8)  
PIN 4  
PIN 5  
BOTTOM VIEW  
.45  
.300  
.150  
.600  
REF  
.600  
.150  
PIN 2  
PIN 3  
PIN 6  
PIN 7  
PIN 8  
Dimensions are in inches (mm shown for ref. only).  
MATERIAL:  
Third Angle Projection  
.040 PINS: C26000 BRASS, 3/4 HARD  
.062 PINS: C10200 COPPER ALLOY, FULL HARD  
FINISH: (ALL PINS)  
GOLD (5 MICROINCHES MIN) OVER NICKEL (50 MICROINCHES MIN)  
Tolerances (unless otherwise specified):  
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)  
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)  
Angles 02  
Components are shown for reference only.  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 6 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
Soldering Guidelines  
Undervoltage Shutdown limit. Subsequent re-start will not occur until the input  
is brought back up to the Start-Up Threshold. This built in hysteresis prevents  
any unstable on/off situations from occurring at a single input voltage.  
Murata Power Solutions recommends the specifications below when installing these  
converters. These specifications vary depending on the solder type. Exceeding these  
specifications may cause damage to the product. Be cautious when there is high atmo-  
spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your  
production environment may differ; therefore please thoroughly review these guidelines  
Start-Up Time  
The VIN to VOUT Start-Up Time is the interval of time between the point at which  
the ramping input voltage crosses the Start-Up Threshold and the fully loaded  
output voltage enters and remains within its specified accuracy band. Actual  
measured times will vary with input source impedance, external input/output  
capacitance, and load. The UWE Series implements a soft start circuit that  
limits the duty cycle of its PWM controller at power up, thereby limiting the  
input inrush current.  
with your process engineers.  
Wave Solder Operations for through-hole mounted products (THMT)  
For Sn/Ag/Cu based solders:  
Maximum Preheat Temperature  
Maximum Pot Temperature  
Maximum Solder Dwell Time  
For Sn/Pb based solders:  
Maximum Preheat Temperature  
Maximum Pot Temperature  
Maximum Solder Dwell Time  
115° C.  
270° C.  
7 seconds  
The On/Off Control to VOUT start-up time assumes the converter has its  
nominal input voltage applied but is turned off via the On/Off Control pin. The  
specification defines the interval between the point at which the converter is  
turned on and the fully loaded output voltage enters and remains within its  
specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control  
to VOUT start-up time is also governed by the internal soft start circuitry and  
external load capacitance.  
105° C.  
250° C.  
6 seconds  
Absolute Maximum Ratings  
Input Voltage  
Q12 Models - Volts, max. continuous  
Volts, transient, 100 mSec  
Q48 Models - Volts, max. continuous  
0-36 VDC  
0-50 VDC  
0-75 VDC  
The difference in start up time from VIN to VOUT and from On/Off Control to  
VOUT is therefore insignificant.  
Volts, transient, 100 mSec  
On/Off Control  
0-100 VDC  
-0.7 V. min to +Vin max.  
Input Source Impedance  
UWE converters must be driven from a low ac-impedance input source.  
The DC/DC’s performance and stability can be compromised by the use of  
highly inductive source impedances. For optimum performance, compo-  
nents should be mounted close to the DC/DC converter. If the application  
has a high source impedance, low VIN models can benefit from increased  
external input capacitance.  
Input Reverse Polarity Protection  
Output Overvoltage  
See Fuse section.  
Vout nom. +20ꢀ max.  
Output Current (Note 7)  
Devices can  
Current-limited.  
withstand sustained short circuit  
without damage.  
Overtemperature Protection  
Device includes electronic over-  
temperature shutdown protection  
under normal operation.  
-55 to +125° C.  
I/O Filtering, Input Ripple Current, and Output Noise  
Storage Temperature  
Lead Temperature  
All models in the UWE Converters are tested/specified for input reflected ripple  
current and output noise using the specified external input/output components/  
circuits and layout as shown in the following two figures.  
See soldering specifications  
Absolute maximums are stress ratings. Exposure of devices to greater than any of these  
conditions may adversely affect long-term reliability. Proper operation under conditions  
other than those listed in the Performance/Functional Specifications Table is not implied or  
recommended.  
External input capacitors (CIN in Figure 2) serve primarily as energy-storage  
elements, minimizing line voltage variations caused by transient IR drops in  
conductors from backplane to the DC/DC. Input caps should be selected for bulk  
capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current  
ratings. The switching nature of DC/DC converters requires that dc voltage  
sources have low ac impedance as highly inductive source impedance can affect  
system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your  
specific system configuration may necessitate additional considerations.  
TECHNICAL NOTES  
Input Fusing  
Certain applications and/or safety agencies may require the installation of  
fuses at the inputs of power conversion components. Fuses should also be  
used if the possibility of sustained, non-current-limited, input-voltage polarity  
reversals exist. For MPS UWE DC/DC Converters, you should use fast-blow type  
fuses, installed in the ungrounded input supply line. Refer to the specifications  
for fuse values.  
TO  
CURRENT  
PROBE  
OSCILLOSCOPE  
+INPUT  
LBUS  
+
All relevant national and international safety standards and regulations must  
be observed by the installer. For system safety agency approvals, the convert-  
ers must be installed in compliance with the requirements of the end-use  
safety standard, e.g., IEC/EN/UL60950-1.  
VIN  
CBUS  
CIN  
–
–INPUT  
CIN = 33µF, ESR < 700mΩ @ 100kHz  
CBUS = 220µF, ESR < 100mΩ @ 100kHz  
LBUS = 12µH  
Input Undervoltage Shutdown and Start-Up Threshold  
Under normal start-up conditions, devices will not begin to regulate until  
the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once  
operating, devices will not turn off until the input voltage drops below the  
Figure 2. Measuring Input Ripple Current  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 7 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
In critical applications, output ripple/noise (also referred to as periodic and  
random deviations or PARD) may be reduced below specified limits using filter-  
ing techniques, the simplest of which is the installation of additional external  
output capacitors. These output caps function as true filter elements and  
should be selected for bulk capacitance, low ESR and appropriate frequency  
response. All external capacitors should have appropriate voltage ratings and  
be located as close to the converter as possible. Temperature variations for all  
relevant parameters should also be taken carefully into consideration.  
Thermal Shutdown  
These UWE converters are equipped with thermal-shutdown circuitry. If envi-  
ronmental conditions cause the internal temperature of the DC/DC converter to  
rise above the designed operating temperature, a precision temperature sensor  
will power down the unit. When the internal temperature decreases below the  
threshold of the temperature sensor, the unit will self start. See Performance/  
Functional Specifications.  
Output Overvoltage Protection  
The most effective combination of external I/O capacitors will be a function  
of line voltage and source impedance, as well as particular load and layout  
conditions. Our Applications Engineers can recommend potential solutions and  
discuss the possibility of our modifying a given device's internal filtering to  
meet your specific requirements. Contact our Applications Engineering Group  
for additional details.  
UWE output voltages are monitored for an overvoltage condition via magnetic  
feedback. The signal is coupled to the primary side and if the output voltage  
rises to a level which could be damaging to the load, the sensing circuitry will  
power down the PWM controller causing the output voltages to decrease. Fol-  
lowing a time-out period the PWM will restart, causing the output voltages to  
ramp to their appropriate values. If the fault condition persists, and the output  
voltages again climb to excessive levels, the overvoltage circuitry will initiate  
another shutdown cycle. This on/off cycling is referred to as "hiccup" mode.  
In Figure 3, the two copper strips simulate real-world pcb impedances  
between the power supply and its load. In order to minimize measurement  
errors, scope measurements should be made using BNC connectors, or the  
probe ground should be less than ½ inch and soldered directly to the fixture.  
Current Limiting  
As soon as the output current increases to substantially above its rated value,  
the DC/DC converter will go into a current-limiting mode. In this condition, the  
output voltage will decrease proportionately with increases in output current,  
thereby maintaining somewhat constant power dissipation. This is commonly  
referred to as power limiting. Current limit inception is defined as the point at  
which the full-power output voltage falls below the specified tolerance. See  
Performance/Functional Specifications. If the load current, being drawn from  
the converter, is significant enough, the unit will go into a short circuit condition  
as specified under "Performance."  
COPPER STRIP  
+SENSE  
+OUTPUT  
R
LOAD  
SCOPE  
C1  
C2  
–OUTPUT  
–SENSE  
COPPER STRIP  
Short Circuit Condition  
When a converter is in current-limit mode, the output voltage will drop as  
the output current demand increases. If the output voltage drops too low, the  
magnetically coupled voltage used to develop primary side voltages will also  
drop, thereby shutting down the PWM controller. Following a time-out period,  
the PWM will restart causing the output voltages to begin ramping to their  
appropriate values. If the short-circuit condition persists, another shutdown  
cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The  
hiccup cycling reduces the average output current, thereby preventing internal  
temperatures from rising to excessive levels. The UWE is capable of enduring  
an indefinite short circuit output condition.  
C1 = 0.47µF CERAMIC  
C2 = NA  
LOAD 2-3 INCHES (51-76mm) FROM MODULE  
Figure 3. Measuring Output Ripple/Noise (PARD)  
Floating Outputs  
Since these are isolated DC/DC converters, their outputs are "floating" with  
respect to their input. Designers will normally use the –Output as the ground/  
return of the load circuit. You can, however, use the +Output as ground/return  
to effectively reverse the output polarity.  
Features and Options  
Minimum Output Loading Requirements  
On/Off Control  
UWE converters employ a synchronous-rectifier design topology and all models  
regulate within spec and are stable under no-load to full load conditions.  
Operation under no-load conditions however might slightly increase the output  
ripple and noise.  
The input-side, remote On/Off Control function can be ordered to operate with  
either polarity:  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 8 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
Positive-polarity models (“P" part-number suffix) are enabled when the  
On/Off Control is left open or is pulled high, as per Figure 4. Positive-polarity  
devices are disabled when the On/Off Control is pulled low.  
+OUTPUT  
–INPUT  
+SENSE  
Negative-polarity devices (“N” suffix) are off when the On/Off Control is open  
(or pulled high), and on when the On/Off Control is pulled low with respect to  
–Vin as shown in Figure 5.  
20kΩ  
5-20  
TURNS  
ON/OFF  
CONTROL  
LOAD  
TRIM  
–SENSE  
+INPUT  
–OUTPUT  
+ Vcc  
ON/OFF CONTROL  
CONTROL  
Figure 6. Trim Connections Using A Trimpot  
+OUTPUT  
–INPUT  
+SENSE  
TRIM  
-INPUT  
ON/OFF  
CONTROL  
LOAD  
R1  
Figure 4. Driving the Positive Polarity On/Off Control Pin  
–SENSE  
–OUTPUT  
+INPUT  
+INPUT  
+VCC  
Figure 7. Trim Connections To Increase Output Voltages Using a Fixed Resistor  
ON/OFF  
CONTROL  
+OUTPUT  
–INPUT  
+SENSE  
–INPUT  
ON/OFF  
TRIM  
–SENSE  
LOAD  
CONTROL  
R2  
Figure 5. Driving the Negative Polarity On/Off Control Pin  
+INPUT  
–OUTPUT  
Figure 8. Trim Connections To Decrease Output Voltages  
Dynamic control of the remote on/off function is facilitated with a mechanical  
relay or an open-collector/open-drain drive circuit (optically isolated if appropri-  
A single resistor connected from the Trim to the +Output, or +Sense where  
applicable, will increase the output voltage in this configuration. A resistor con-  
ate). The drive circuit should be able to sink appropriate current (see Performance nected from the Trim to the –Output, or –Sense where applicable, will decrease  
Specs) when activated and withstand appropriate voltage when deactivated.  
Applying an external voltage to the On/Off Control when no input power is  
applied to the converter can cause permanent damage to the converter.  
the output voltage in this configuration.  
Trim adjustments greater than the specified range can have an adverse  
affect on the converter's performance and are not recommended. Excessive  
voltage differences between VOUT and Sense, in conjunction with trim adjust-  
ment of the output voltage, can cause the overvoltage protection circuitry to  
activate (see Performance Specifications for overvoltage limits). Power derating  
is based on maximum output current and voltage at the converter’s output  
pins. Use of trim and sense functions can cause output voltages to increase,  
thereby increasing output power beyond the converter's specified rating or  
cause output voltages to climb into the output overvoltage region. Therefore:  
Trimming Output Voltage  
UWE converters have a trim capability that allows users to adjust the output  
voltages. Adjustments to the output voltages can be accomplished via a trim pot  
(Figure 6) or a single fixed resistor as shown in Figures 7 and 8. A single fixed  
resistor can increase or decrease the output voltage depending on its connec-  
tion. The resistor should be located close to the converter and have a TCR less  
than 100ppm/°C to minimize sensitivity to changes in temperature. If the trim  
function is not used, leave the trim pin floating.  
(VOUT at pins) x (IOUT) <= rated output power  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 9 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
Remote Sense Note: The Sense and VOUT lines are internally connected  
through low value resistors. Nevertheless, if the sense function is not used for  
remote regulation the user should connect the +Sense to +VOUT and –Sense to  
–VOUT at the DC/DC converter pins.  
Trim Equations  
3.3 Volt Output  
Trim Up  
Trim Down  
UWE series converters have a sense feature to provide point of use regula-  
tion, thereby overcoming moderate IR drops in pcb conductors or cabling.  
The remote sense lines carry very little current and therefore require minimal  
cross-sectional-area conductors. The sense lines are used by the feedback  
control-loop to regulate the output. As such, they are not low impedance points  
and must be treated with care in layouts and cabling. Sense lines on a pcb  
should be run adjacent to dc signals, preferably ground. In cables and discrete  
wiring applications, twisted pair or other techniques should be implemented.  
16.31  
13.3(VO – 1.226)  
VO – 3.3  
–10.2  
–10.2  
–10.2  
–10.2  
–10.2  
RTDOWN (kΩ) =  
RTUP (kΩ) =  
RTUP (kΩ) =  
RTUP (kΩ) =  
RTUP (kΩ) =  
3.3 – VO  
5 Volt Output  
25.01  
20.4(VO – 1.226)  
VO – 5  
–10.2  
RTDOWN (kΩ) =  
5 – VO  
12 Volt Output  
UWE series converters will compensate for drops between the output volt-  
age at the DC/DC and the sense voltage at the DC/DC provided that:  
60.45  
49.6(VO – 1.226)  
VO – 12  
–10.2  
RTDOWN (kΩ) =  
12 – VO  
[VOUT(+) –VOUT(–)] –[Sense(+) –Sense (–)] ≤ 5ꢀ VOUT  
24 Volt Output  
RTDOWN (kΩ) =  
Output overvoltage protection is monitored at the output voltage pin, not  
the Sense pin. Therefore, excessive voltage differences between VOUT and  
Sense in conjunction with trim adjustment of the output voltage can cause the  
overvoltage protection circuitry to activate (see Performance Specifications  
for overvoltage limits). Power derating is based on maximum output current  
and voltage at the converter’s output pins. Use of trim and sense functions can  
cause output voltages to increase thereby increasing output power beyond the  
UWE’s specified rating or cause output voltages to climb into the output over-  
voltage region. Also, the use of Trim Up and Sense combined may not exceed  
+10ꢀ of VOUT. Therefore, the designer must ensure:  
124.2  
101(VO – 1.226)  
VO – 24  
–10.2  
24 – VO  
Note: Resistor values are in kΩ. Adjustment accuracy is subject to resistor  
tolerances and factory-adjusted output accuracy. VO = desired output voltage.  
(VOUT at pins) x (IOUT) ≤ rated output power  
Contact and PCB resistance  
losses due to IR drops  
+OUTPUT  
–INPUT  
IOUT  
+SENSE  
Sense Current  
ON/OFF  
CONTROL  
TRIM  
–SENSE  
LOAD  
Sense Return  
IOUT Return  
+INPUT  
–OUTPUT  
Contact and PCB resistance  
losses due to IR drops  
Figure 9. Remote Sense Circuit Configuration  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 10 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
PERFORMANCE DATA  
UWE-12/6-Q12N  
Efficiency vs. Line Voltage and Load Current @ 25°C  
Power Dissipation vs. Load Current @ 25°C  
10  
9
8
7
6
5
4
3
2
1
94  
92  
90  
88  
86  
84  
82  
80  
78  
76  
74  
72  
70  
68  
Vin = 36 V  
Vin = 30 V  
Vin = 24 V  
Vin = 12 V  
Vin = 10 V  
Vin = 9 V  
Vin = 36 V  
Vin = 30 V  
Vin = 24 V  
Vin = 12 V  
Vin = 10 V  
Vin = 9 V  
1
2
3
4
5
6
1
2
3
4
5
6
Load Current (Amps)  
Load Current (Amps)  
UWE-12/6-Q12N  
Maximum Current Temperature Derating @ sea level  
Maximum Current Temperature Derating @sea level  
(Vin = 12V, transverse airflow, no baseplate)  
(Vin = 12V, transverse airflow, with baseplate)  
6.0  
6.0  
5.5  
5.0  
4.5  
4.0  
Natural Convection  
100 LFM  
Natural Convection  
5.5  
200 LFM  
300+ LFM  
100 LFM  
200 LFM  
300 LFM  
400 LFM  
5.0  
4.5  
4.0  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
Ambient Temperature (°C)  
Ambient Temperature (°C)  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 11 of 12  
UWE Series  
Wide Input, Isolated  
Eighth-Brick DC/DC Converters  
PERFORMANCE DATA  
UWE-24/3-Q12P  
Efficiency vs. Line Voltage and Load Current @ 25°C  
Power Dissipation vs. Load Current @ 25°C  
95  
93  
91  
89  
87  
85  
83  
81  
79  
77  
75  
73  
71  
69  
67  
65  
12  
11  
10  
9
8
Vin = 36 V  
Vin = 30 V  
Vin = 24 V  
Vin = 12 V  
Vin = 10 V  
Vin = 9 V  
7
6
Vin = 36 V  
Vin = 30 V  
Vin = 24 V  
Vin = 12 V  
Vin = 10 V  
Vin = 9 V  
5
4
3
0.5  
1
1.5  
2
2.5  
3
2
Load Current (Amps)  
0.5  
1
1.5  
2
2.5  
3
Load Current (Amps)  
UWE-24/3-Q12P  
Maximum Current Temperature Derating @ sea level  
Maximum Current Temperature Derating @sea level  
(Vin = 12V, transverse airflow, no baseplate)  
(Vin = 12V, transverse airflow, with baseplate)  
3.20  
3.10  
3.00  
3.20  
3.00  
2.80  
2.60  
2.40  
2.90  
Natural Convection  
100 LFM  
Natural Convection  
100 LFM  
200 LFM  
300 LFM  
400 LFM  
2.80  
2.70  
2.60  
2.50  
2.40  
200 LFM  
300 LFM  
400 LFM  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
Ambient Temperature (°C)  
Ambient Temperature (°C)  
USA:  
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com  
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com  
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com  
Canada:  
UK:  
Murata Power Solutions, Inc.  
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.  
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356  
France:  
Germany:  
Japan:  
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com  
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com  
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com  
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com  
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED  
11/17/08  
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other  
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply  
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without  
China:  
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com  
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com  
notice.  
© 2008 Murata Power Solutions, Inc.  
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com  
www.murata-ps.com  
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000  
MDC_UWE Series.A11 Page 12 of 12  
厂商 型号 描述 页数 下载

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