EXB50 Dual Series
D u a l p o s i t i v e o u t p u t
DC/DC CONVERTERS 50W High Efficiency DC/DC Converters
1
• Two independently regulated positive outputs
• Each output offers ultra-wide output voltage
trim range (0.8V to 3.6V for EXB50-48D3V3-1V8,
1.5V to 5.25V for EXB50-48D05-3V3)
• High efficiency topology, 89% typical
• Approved to IEC60950, UL/cUL1950
• Operating ambient temperature of -40°C to +70°C
(natural convection)
• No minimum load on either output
• Complies with ETS 300 019-1-3/2-3 and ETS 300 386-1
The EXB50 Dual is a 50W independently regulated dual output DC/DC converter specifically
designed to meet the power needs of low voltage silicon. Housed in an open frame package
1
with an industry standard
/ brick footprint, the EXB50 Dual can deliver up to 8.5A from either
2
output, and up to 11A in total, at temperatures of up to 70ºC under natural convection. With
some forced air and/or reduced ambient temperatures, the EXB50 can deliver up to 8.5A from
either output, and up to 17A in total. The converter is primarily intended for the networking,
telecoms and wireless markets, where small size, lower output voltages with higher currents,
low profile and high efficiency are all key demands. Product features include wide output trim
and remote on/off. Overvoltage, short circuit and over-temperature protection combines to
make the EXB50 Dual a very robust and flexible product.
TÜV
2 YEAR WARRANTY
All specifications are typical at Vin = 48V, Io1 = 5A, Io2 = 5A, Tamb = 25°C unless otherwise stated
SPECIFICATIONS
OUTPUT SPECIFICATIONS
EMC CHARACTERISTICS
ETS 300 386-1 table 5
Conducted emissions
(See Note 3)
Radiated emissions
Immunity:
ESD air
ESD contact
EFT DC power
EFT signal
Voltage adjustability
EXB50-48D3V3-1V8
0.8V to 3.6V
1.5V to 5.25V
EN55022 with external filter
EN55022 with external filter
EN55022
Level A
Level B
Level A
EXB50-48D05-3V3
Voltage accuracy
Line regulation
Both outputs
±0.5% max.
Low line to high line
Low line to high line
Vout1 ±0.5%
Vout2 ±0.5%
EN61000-4-2 8kV (NP), 15kV (RP)
EN61000-4-2 6kV (NP), 8kV (RP)
EN61000-4-4 2kV (NP), 4kV (LFS)
EN61000-4-4 1kV (NP), 2kV (LFS)
Load regulation
Minimum load
Full load to no load
Both outputs
±0.5%
0%
Radiated field enclosure EN61000-4-3 10V/m (NP)
Surges indoor signal
EN61000-4-5 500V (RP)
Conducted (DC power) EN61000-4-6 10V (NP)
Ripple and noise
20MHz bandwidth
Both outputs
150mV pk-pk max.
30mV rms max.
Conducted (signal)
Input transients
EN61000-4-6 10V (NP)
ETS 300 132-2, ETR 283
Transient response
peak dev. settling time
3A to 5A (1A/10µs)
and back
150mV
400µs
GENERAL SPECIFICATIONS
Efficiency
89% typ.
1500VDC
Short circuit protection
EXB50-48D3V3-1V8
EXB50-48D05-3V3
17A rms
15A rms
Basic insulation
Input fuse 48V
Input/output
(See Note 2)
4A slow blow HRC
INPUT SPECIFICATIONS
Input voltage range
Input current
Switching frequency
(fixed)
EXB50-48D3V3-1V8
EXB50-48D05-3V3
250kHz
300kHz
48Vin nominal
36 to 75VDC
Approvals and
standards
IEC60950
UL/cUL1950
No load
Remote OFF
100mA max.
4mA max.
Material Flammability
Weight
UL94V-0
42g (1.48oz)
177,362 hours
UVLO turn ON voltage
All inputs
34V typ.
33V typ.
UVLO turn OFF voltage All inputs
MTBF
MIL-HDBK-217
Active high remote ON/OFF
Logic compatibility
ON
Open collector ref. to -input
Open circuit voltage or >3.2VDC
<0.4VDC
ENVIRONMENTAL SPECIFICATIONS
OFF (See Note 7)
Thermal performance
(See Notes 4 and 5)
Operating ambient
-40°C to +100°C,
see curves
-40°C to +120°C
Active low remote ON/OFF
Logic compatibility
ON
temperature
Open collector ref. to -input
0.4VDC max.
Open circuit voltage or >3.2VDC
Non-operating
OFF (See Note 7)
ETS 300 019-2-3
Air temperature
Classes T3.1 to T3.5
Low: IEC 68-2-1
High: IEC 68-2-2
Change: IEC 68-2-14
-40°C
+70°C
-40°C to +70°C
Relative humidity
IEC 68-2-56
IEC 68-2-30
10% to 100% RH
Condensation
File Name: EXB50D.PDF Rev: 10 June 2002
