EXB50 Dual Series
D u a l p o s i t i v e o u t p u t
• Two independently regulated positive outputs
• Each output offers ultra-wide output voltage
trim range
• 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
• Available RoHS compliant
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
with an industry standard 1/2 brick footprint, the EXB50 Dual can deliver up to 8.5 A from either
output, and up to 11 A in total, at temperatures of up to 70 ºC under natural convection. With
some forced air and/or reduced ambient temperatures, the EXB50 can deliver up to 8.5 A from
either output, and up to 17 A 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 overtemperature protection combines to make
the EXB50 Dual a very robust and flexible product.
2 YEAR WARRANTY
All specifications are typical at Vin = 48 V, Io1 = 5 A, Io2 = 5 A, Tamb = 25 °C unless otherwise stated
SPECIFICATIONS
OUTPUT SPECIFICATIONS
EMC CHARACTERISTICS
ETS 300 386-1 table 5
Conducted emissions
Voltage adjustability
EXB50-48D3V3-1V8J
0.8-3.6 Vdc
EN55022 with external filter
EN55022 with external filter
EN55022
Level A
Level B
Level A
EXB50-48D05-3V3J
1.5-5.25 Vdc
(See Note 3)
Radiated emissions
Immunity:
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%
ESD air
EN61000-4-2 8 kV (NP), 15 kV (RP)
EN61000-4-2 6 kV (NP), 8 kV (RP)
EN61000-4-4 2 kV (NP), 4 kV (LFS)
EN61000-4-4 1 kV (NP), 2 kV (LFS)
ESD contact
EFT dc power
EFT signal
Load regulation
Minimum load
Full load to no load
Both outputs
0.5%
0%
Radiated field enclosure EN61000-4-3 10 V/m (NP)
Surges indoor signal
Conducted (dc power)
Conducted (signal)
Input transients
EN61000-4-5 500 V (RP)
EN61000-4-6 10 V (NP)
EN61000-4-6 10 V (NP)
ETS 300 132-2, ETR 283
Ripple and noise
20 MHz bandwidth
Both outputs
150 mV pk-pk max.
30 mV rms max.
Transient response
peak dev. settling time
3 A to 5 A (1 A/10 µs)
and back
150 mV
400 µs
GENERAL SPECIFICATIONS
Efficiency
89% typ.
1500 Vdc
Short circuit protection
EXB50-48D3V3-1V8J
EXB50-48D05-3V3J
17 A rms
15 A rms
Basic insulation
Input fuse 48 V
Input/output
(See Note 2)
4 A slow blow HRC
INPUT SPECIFICATIONS
Input voltage range
Input current
Switching frequency
(fixed)
EXB50-48D3V3-1V8J
EXB50-48D05-3V3J
250 kHz
300 kHz
48 Vin nominal
36-75 Vdc
Approvals and
standards
IEC60950
UL/cUL1950
No load
Remote OFF
100 mA max.
4 mA max.
Material Flammability
Weight
UL94V-0
42 g (1.48 oz)
177,362 hours
UVLO turn ON voltage
All inputs
34 V typ.
33 V 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 >3.2 Vdc
<0.4 Vdc
ENVIRONMENTAL SPECIFICATIONS
OFF (See Note 7)
Thermal performance
(See Notes 4 and 5)
Operating ambient -40 °C to +100 °C,
Active low remote ON/OFF
Logic compatibility
ON
temperature
see curves
Open collector ref. to -input
0.4 Vdc max.
Non-operating
-40 °C to +120 °C
OFF (See Note 7)
Open circuit voltage or >3.2 Vdc
ETS 300 019-2-3
Air temperature
Classes T3.1 to T3.5
Low: IEC 68-2-1
High: IEC 68-2-2
-40 °C
+70 °C
International Safety Standard Approvals
Change: IEC 68-2-14 -40 °C to +70 °C
UL/cUL CAN/CSA 22.2 No. E174104
UL 60950 File No. E174104
Relative humidity
IEC 68-2-56
IEC 68-2-30
10% to 100% RH
condensation
TÜV Product Service (EN60950) Certificate No. B 01 09 38572 024
CB report and certificate to IEC60950
File Name: exb50d.pdf Rev (02): 30 Nov 2005
