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0RQB-T0T120G

型号：

0RQB-T0T120G

品牌：

BEL[ BEL FUSE INC. ]

页数：

18 页

PDF大小：

494 K

下载PDF手册
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
0RQB-T0T12x  
Features  
RoHS Compliant  
Rev.C  
Isolated  
Output Over-Voltage Shutdown  
Output Voltage Trim  
High Efficiency  
High Power Density  
Fixed Frequency (250 kHz)  
Low Cost  
OCP/SCP  
Over Temperature Protection  
Remote On/Off  
Input Under-Voltage Lockout  
Basic Insulation  
Positive/Negative Remote Sense  
Class 1, Category 2, Isolated DC/DC Converter (refer to IPC-9592)  
TUV EN60950-1 Recognized (Pending)  
UL60950-1 Recognized (UL/cUL) (Pending)  
Applications  
Networking  
Computers and peripherals  
Telecommunications  
Description  
The 0RQB-T0T12X is an isolated dc/dc converter that operates from a nominal 48 Vdc source. This unit will  
provide up to 300 W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and  
low cost. Features include remote on/off, over current protection and under voltage lockout. The converter is  
provided in an industry standard quarter brick package.  
Part Selection  
Output  
Input Voltage  
Max. Output Max. Output  
Typical  
Efficiency  
Model Number  
Active High  
Model Number  
Active Low  
Voltage  
Current  
Power  
12 Vdc  
36 Vdc - 75 Vdc  
25 A  
300 W  
95.5%  
0RQB-T0T120  
0RQB-T0T12L  
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.  
Part Number Explanation  
0 R QB – T0 T 12 0  
1
2
3
4
5 6  
7
1---Through hole  
2---RoHS 6, change “R” to “7” means RoHS 5  
3---Series name, 1/4 Brick  
4---Series code  
5---Input range 48V wide (36-75V)  
6---Output voltage 12V  
7---Remote sense, active high, change “0” to “L” means active low  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
1
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Absolute Maximum Ratings  
Unit  
V
Parameter  
Min  
-0.3  
-
Typ  
Max  
80  
Notes  
Continuous Input Voltage  
Input Transient Voltage  
Remote On/Off  
-
-
-
-
-
-
100  
18  
V
100 mS maximum  
-0.3  
-
V
I/O Isolation Voltage  
Ambient Temperature  
Storage Temperature  
1500  
85  
V
-40  
-55  
C  
C  
125  
Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may  
permanently damage the device.  
Input Specifications  
Parameter  
Min  
Typ  
Max  
Unit  
Notes  
Operating Input Voltage  
36  
48  
75  
V
Input Current (full load)  
Input Current (no load)  
Remote Off Input Current  
-
-
-
-
10  
-
A
100  
10  
mA  
mA  
-
Tested with simulated source  
impedance of 10 uH, 5 Hz to 20 MHz;  
use a 100 uF/100 V electrolytic  
capacitor with ESR = 1 ohm max. at  
200 kHz at 25 C.  
Input Reflected Ripple Current  
(rms)  
-
-
15  
50  
-
-
mA  
Input Reflected Ripple Current  
(pk-pk)  
I2t Inrush Current Transient  
Turn-on Voltage Threshold  
Turn-off Voltage Threshold  
mA  
-
-
TBD  
34.5  
33.5  
-
35.5  
-
A2s  
V
32.5  
V
CAUTION: This converter is not internally fused. An input line fuse must be used in application.  
Recommend a fast-acting fuse with maximum rating of 13A on system board. Refer to the fuse  
manufacture’s datasheet for further information.  
Notes: 1. This converter has internal C-L-C (1uF-1.0uH-15.4uF) filter.  
2. For recommended external input filter, please refer to Safety section (page 14).  
3. All specifications are typical at 25 C unless otherwise stated.  
Output Specifications  
Parameter  
Min  
Typ  
Max  
Unit  
Notes  
Output Voltage Set Point  
11.760  
12.004  
12.240  
V
Vin=48V, Io=50% load  
Load Regulation  
Line Regulation  
-
-
±30  
±12  
±60  
±24  
mV  
mV  
Regulation Over Temperature  
(-40deg.C-85deg.C)  
-
±60  
±100  
mV  
0-20 MHz BW, with a 1µF ceramic  
capacitor and a 10uF Tantalum cap at  
output.  
Ripple and Noise (pk-pk)  
Ripple and Noise (rms)  
-
-
150  
40  
200  
80  
mV  
mV  
Ripple and Noise (pk-pk)  
under worst case  
over all operating input voltage, load  
and temperature conditions.  
-
-
TBD  
mV  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
2
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Output Specifications (continued)  
Parameter  
Min  
Typ  
Max  
Unit  
Notes  
Output Current Range  
0
-
25  
A
Output DC Current Limit  
Short Circuit Surge Transient  
Turn on Time  
-
-
33  
TBD  
100  
0
-
-
A
A2s  
mS  
%
-
150  
3
Overshoot at Turn on  
-
Output Capacitance  
0
-
5600  
uF  
Transient Response  
Overshoot  
-
-
-
-
-
-
-
-
400  
300  
400  
300  
mV  
uS  
△V50%~75% of  
Max Load  
di/dt=0.1A/us, Vin=48Vdc, Ta=25°C,  
with a 1µF ceramic capacitor and a  
10uF Tantalum cap at the output.  
Settling Time  
Overshoot  
mV  
uS  
△V75%~50% of  
Max Load  
Settling Time  
Note: All specifications are typical at nominal input, full load at 25°C unless otherwise stated.  
General Specifications  
Parameter  
Min  
Typ  
Max  
Unit  
Notes  
Vin=48V, full load  
Efficiency  
-
95.5  
-
%
Switching Frequency  
-
250  
-
-
kHz  
This voltage is achieved by trimming  
up output slowly  
Output Voltage Trim Range  
90  
105  
%Vo  
Over Temperature Protection  
Over Voltage Protection(Static)  
Weight  
-
-
-
125  
14  
-
-
-
C  
V
60  
g
Calculated Per Bell Core SR-332  
(Vin=48 V, Vo=12 V, Io=20 A, Ta = 25  
C, FIT=109/MTBF)  
FIT  
TBD  
-
-
Dimensions  
Inches (L × W × H)  
2.30 x 1.45 x 0.50  
Millimeters (L × W × H)  
58.42 x 36.83 x 12.70  
Isolation characteristics  
Input to Output  
-
-
1500  
V
V
Input to Case  
-
-
1500  
500  
Output to Case  
-
10M  
-
-
-
V
Isolation Resistance  
Isolation Capacitance  
ohm  
pF  
2200  
-
Note: All specifications are typical at 25 C unless otherwise stated.  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
3
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Efficiency Data  
98.00%  
96.00%  
94.00%  
92.00%  
90.00%  
88.00%  
86.00%  
84.00%  
82.00%  
80.00%  
36 V  
48 V  
75 V  
2.50  
6.25  
12.50  
18.75  
25.00  
OUTPUT CURRENT(A)  
Thermal Derating Curves  
Maximum junction temperature of semiconductors derated to 120 degree C.  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
4
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Thermal Derating Curves (continued)  
Derating curve under normal input  
Derating curve under worse case input  
TBD  
Temperature reference points on top side  
Temperature reference points on bottom side  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
5
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Ripple and Noise Waveform  
.
48 Vdc input, 12Vdc/25A output  
Note: Ripple and Noise at full load, Ta=25°C, with a 1µF ceramic capacitor and a 10uF Tantalum cap at the  
output.  
Transient Response Waveforms  
50%-75% Load Transients  
75%-50% Load Transients  
Note: Transient Response at di/dt=0.1A/uS, Ta=25°C, with 1uF ceramic cap and 10uF aluminum cap at  
output.  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
6
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Startup & Shutdown  
Rise Time  
Test Condition:  
48Vdc input, 12Vdc/25A  
output, and Ta=25 deg C  
Startup time  
Startup from Vin  
Ch1: Vo  
Ch2: Vin  
Startup from on/off  
Ch1: Vo  
Ch2: on/off  
Test Condition: 48Vdc input, 12Vdc/25A output  
and Ta=25 deg C  
Test Condition: 48Vdc input, 12Vdc/25A output  
and Ta=25 deg C  
Shutdown  
Test Condition:  
48Vdc input, 12Vdc/25A  
output, and Ta=25 deg C  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
7
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Remote On/Off  
Parameter  
Min  
Typ  
Max  
Unit  
Notes  
Signal Low (Unit On)  
Signal High (Unit Off)  
Signal Low (Unit Off)  
Signal High (Unit On)  
Current Sink  
-0.3  
-
0.8  
V
0RQB-T0T12L. The remote on/off pin  
open, Unit off.  
Active Low  
Active High  
2.4  
-0.3  
2.4  
0
-
-
-
-
18  
0.8  
18  
V
V
0RQB-T0T120. The remote on/off pin  
open, Unit on.  
V
0.75  
mA  
Recommended remote on/off circuit for active low  
Vin+  
On/off  
Vin-  
Vin+  
On/off  
Vin-  
Control with open collector/drain circuit  
Control with photocoupler circuit  
Vin+  
Vin+  
On/off  
Vin-  
Vcc  
On/off  
Vin-  
Control with logic circuit  
Permanently on  
Recommended remote on/off circuit for active high  
Vin+  
Vin+  
On/off  
Vin-  
On/off  
Vin-  
Control with open collector/drain circuit  
Control with photocoupler circuit  
Vin+  
Vin+  
Vcc  
On/off  
Vin-  
On/off  
Vin-  
Control with logic circuit  
Permanently on  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
8
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Output Trim Equations  
Equations for calculating the trim resistor are shown below. The Trim Down resistor should be connected  
between the Trim pin and GND pin. The Trim Up resistor should be connected between the Trim pin and the  
Vout pin. Only one of the resistors should be used for any given application.  
Minimum trim down voltage is 10.8V  
Maximum trim up voltage is 12.6V.  
The total voltage increased by trim and remote sense should not exceed 5% of the nominal output voltage.  
Vout  
Vo _ req  
Rtrimdown  
1[k]  
Vo Vo _ req  
Module  
Module  
Trim  
GND  
Rtrimdown  
Rtrimup  
Vout  
Trim  
GND  
Vo _ req  
Rtrimup  
1  
k  
Vo Vo _ req  
Note:  
Vo _ req Vo  
delta   
100  
%
  
Vo  
Vo_req=Desired (trimmed) output voltage [V]  
Output voltage Vo=12.006 V  
5000  
4500  
4000  
3500  
3000  
2500  
2000  
1500  
1000  
500  
400  
360  
320  
280  
240  
200  
160  
120  
80  
40  
0
0
12 12.12 12.24 12.36 12.48 12.6 12.72 12.84 12.96 13.08 13.2  
Adjusted output voltage Vo,adj(V)  
9.8 10.02 10.24 10.46 10.68 10.9 11.12 11.34 11.56 11.78 12  
Adjusted output voltage Vo,adj (V)  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
9
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Remote Sense  
This module has remote sense compensation feature. It can minimize the effects of resistance between  
module’s output and load in system layout and facilitates accurate voltage regulation at load terminals or  
other selected point.  
1. The remote sense lines carries very little current and hence do not require a large cross-sectional area.  
2. This module compensates for a maximum drop of 5% of the nominal output voltage.  
3. If the unit is already trimmed up, the available remote sense compensation range should be  
correspondingly reduced. The total voltage increased by trim and remote sense should not exceed 5%  
of the nominal output voltage.  
4. When using remote sense compensation, all the resistance, parasitic inductance and capacitance of the  
system are incorporated within the feedback loop of this module. It can make an effect on the module's  
compensation, affecting the stability and dynamic response. A 0.1uF ceramic capacitor can be  
connected at the point of load to de-couple noise on the sense wires.  
5. Recommend the connection of remote sense compensation as below figure. There are a resistor RS+  
(30.1 ohm) from Vo+ to Sense+ and a resistor RS- (30.1 ohm)) from Vo- to Sense- inside of this module.  
Vo+  
Sense+  
Load  
Sense-  
Vo-  
6. If not using remote sense compensation, please connect sense directly to output at module's pin, that is,  
connect sense+ to Vo+ and sense- to Vo- at module's pin, the shorter the better. See below figure.  
Vo+  
Sense+  
Load  
Sense-  
Vo-  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
10  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Over Current Protection  
To provide protection in a fault output overload condition, the module is equipped with internal current-limiting  
circuitry and can endure current limiting for a few mili-seconds. If the overcurrent condition persists beyond a few  
milliseconds, the module will shut down into hiccup mode and restart once every 344mS. The module operates  
normally when the output current goes into specified range. The typical average output current is 0.3A during  
hiccup.  
CH1: Output voltage waveform  
CH2: output current waveform and 1A/10mV  
Test at: 48Vdc input, over current output and Ta=25 deg C  
Expansion of on time portion of above figure  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
11  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Over Voltage Protection  
The output overvoltage protection consists of circuitry that monitors the voltage on the output terminals. If  
the voltage on the output terminals exceeds the over voltage protection threshold, the module will shutdown  
into latch off mode. The overvoltage latch can be reset by either cycling the input power or toggling the  
on/off signal for one second at least.  
Note: Due to maximum duty cycle limt, output voltage can not be trimed up to OVP set point in low line  
input.  
Test setup:  
Vo+  
K
Trim  
R
Vo-  
R=10k ohm  
CH1: Input voltage waveform  
CH2: Output voltage waveform  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
12  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Over Temperature Protection  
The OTP is achieved by thermistor R25 and the threshold is set at 120C in non-latch mode; the hottest  
component Q13 reaches 125C with 100LFM air flow correspondingly. It will restart automatically when the  
temperature falls down to 110C. The protecting point will be varied a little under different conditions (air flow,  
ambient temperature, input voltage, load...).  
The hottest component on the top side: Q13  
The thermistor on the bottom side: R25  
Input Under-voltage Lockout  
Under-voltage Lockout  
Voltage Falling  
V1=33.5V  
V2=34.5V  
Voltage Rising  
Input Voltage (V)  
V1  
V2  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
13  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Safety & EMC  
Safety  
1. Material flammability UL94V-0  
2. TUV Certification  
3. UL Certification  
EN60950-1  
UL60950-1  
EMC  
1. Surge  
2. DC-DIP  
3. Conductive EMI  
IEC61000-4-5  
IEC61000-4-29  
EN55022 class B  
Compliance to EN55022 class B (both q.peak and average) with the following inductive and capacitive filter  
C5  
L1  
L2  
+
-
+
-
C3  
C6  
C4  
C1  
C2  
R
Module  
Item  
Designator  
Parameter  
Vendor  
Murata  
Vendor P/N  
1
2
3
4
5
6
7
8
C1  
C2  
C3  
C4  
C5  
C6  
L1  
2.2uF/100V,ceramic  
2.2uF/100V,ceramic  
2.2uF/100V,ceramic  
270uF/100V,AL Cap  
2200pF/2000V,ceramic  
2200pF/2000V,ceramic  
GRF32ER72A225KA11L  
GRF32ER72A225KA11L  
GRF32ER72A225KA11L  
UHE2A271MHD  
Murata  
Murata  
Nichicon  
Johanson  
Johanson  
VAC  
202R29W222KV4E  
202R29W222KV4E  
0.809mH, common mode  
0.809mH, common mode  
T60004-L2025-W622  
T60004-L2025-W622  
L2  
VAC  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
14  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Safety & EMC (continued)  
Positive  
Negative  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
15  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Layout  
Layout of components on top side  
Layout of components on bottom side  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
16  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Mechanical Outline  
Pin Connections  
pin# function pin size  
1
2
3
4
5
6
7
8
Vin (+)  
On/Off  
Vin (-)  
Vo (-)  
Sense (-)  
Trim  
0.04"  
0.04"  
0.04"  
0.06"  
0.04"  
0.04"  
0.04"  
0.06"  
Sense (+)  
Vo (+)  
Note: This module is recommended and compatible with Pb-Free Wave Soldering and must be soldered  
using a peak solder temperature of no more than 260 ºC for less than 5 seconds.  
Note:  
1) All Pins: Material - Copper Alloy;  
Finish – 3 micro inches minimum Gold over 50 micro inches minimum Nickel plate.  
2) Undimensioned components are shown for visual reference only.  
3) All dimensions in inches (mm); Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm).  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
17  
ISOLATED DC/DC CONVERTERS  
36 Vdc - 75 Vdc Input 12 Vdc /25 A Output, 1/4 Brick  
March 27, 2009  
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.  
Labeling Information  
Top View  
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications and D.C. (Date Code) pictured on labels,  
may change depending on the date manufactured.  
Packing Instruction  
TBD  
Revision History  
Date  
Version  
Changes Detail  
Approval  
2007-5-28  
2007-7-18  
2009-3-27  
A
B
C
First release  
Update efficiency data curve and TD curve  
1. Change to new format, include adding application, part number  
explaining, remote sense, OCP, OVP, OTP, UVLO, startup&shutdown,  
safety&EMC and so on. 2. Add input transient voltage, input C-L-C filter,  
recommended input fast-acting fuse on system board. 3. Update trim  
equations.  
RoHS Compliance  
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and  
other hazardous substances from electronic products.  
2009 Bel Fuse Inc. Specifications subject to change without notice. 032709  
18  
CORPORATE  
FAR EAST  
EUROPE  
Bel Fuse Inc.  
Bel Fuse Ltd.  
Bel Fuse Europe Ltd.  
206 Van Vorst Street  
Jersey City, NJ 07302  
Tel 201-432-0463  
Fax 201-432-9542  
www.belfuse.com  
8F/ 8 Luk Hop Street  
San Po Kong  
Kowloon, Hong Kong  
Tel 852-2328-5515  
Fax 852-2352-3706  
www.belfuse.com  
Preston Technology Management Centre  
Marsh Lane, Suite G7, Preston  
Lancashire, PR1 8UD, U.K.  
Tel 44-1772-556601  
Fax 44-1772-888366  
www.belfuse.com  
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