EXB250 Series
DC-DC CONVERTERS
•
High efficiency topology, 90% typical at 3.3 V
•
Industry standard footprint
•
Wide baseplate temperature, -40 ˚C to +100 ˚C
(natural convection)
•
90% to 110% output trim
•
No minimum load
•
Overvoltage protection
•
Remote ON/OFF
•
Available RoHS compliant
Single output
72-165 W High Efficiency DC-DC Converters
1
The EXB250 is a new high efficiency, open-frame, isolated 165 Watt converter series in an
industry standard half-brick footprint. The EXB250 delivers very high output current at low
voltages, and excellent useable power density for today’s high end applications. The design takes
advantage of open frame construction to provide a low weight, low thermal impedance baseplate
design. The seven models in the series feature an input voltage range of 33 Vdc to 75 Vdc and
are available in output voltages of 12 V, 5 V, 3.3 V, 2.5 V, 1.8 V, 1.5 V and 1.2 V. The output voltage
on each model is adjustable from 90% to 110% of the nominal value. Typical efficiencies for the
models are 90% for the 3.3 V, 88% for the 2.5 V and 87% for the 1.8 V version. The EXB250
series also has a remote ON/OFF capability. Overcurrent and overvoltage protection features are
included as standard. With full international safety approval including EN60950 (TÜV Rheinland)
and UL/cUL1950, the EXB250 reduces compliance costs and time to market.
All specifications are typical at nominal input, full load at 25 °C unless otherwise stated
TÜV
2 YEAR WARRANTY
SPECIFICATIONS
OUTPUT SPECIFICATIONS
Voltage adjustability
Set point accuracy
Line regulation
Low line to high line
Load regulation
Minimum load
Overshoot
Undershoot
Ripple and noise
Transient response
(See Note 1)
INPUT SPECIFICATIONS
Input voltage range
Input current
Input current (max.)
(See Note 3)
Input reflected ripple
(See Note 5)
48 Vin nominal
No load
Remote OFF
33-75 Vdc
145 mA max.
35 mA max.
5.7 A max. @ Io max.
and Vin = 33-75 Vdc
350 mA (pk-pk) typ.
Open collector ref to -input
Open circuit or >4.0 Vdc
<1.2 Vdc
32.5 V (typ.)
30.5 V (typ.)
10 ms (typ.)
3 ms (typ.)
At turn-on and turn-off
1.2 V, 1.5 V (Z), 1.8 V (Z),
2.5 V (Z) and 3.3 V (Z) models
5 Hz to 20 MHz
1.2 V model
All other models
Full load to min. load
90% to 110%
±1.6% max.
±0.2% max.
±0.1% max.
±0.2% max.
0%
None
None
EMC CHARACTERISTICS
Conducted emissions
Immunity:
ESD air
ESD contact
Radiated field enclosure
Conducted (DC power)
Conducted (signal)
Input transients
EN55022 (See Note 2)
EN55022 (See Note 2)
Level A
Level B
(NP)
(NP)
(NP)
(NP)
(NP)
EN61000-4-2
8 kV (NP), 15 kV
EN61000-4-2
6 kV (NP), 8 kV
EN61000-4-3
10 V/m
EN61000-4-6
10 V
EN61000-4-6
10 V
ETS 300 132-2, ETR 283
GENERAL SPECIFICATIONS
Efficiency
Operational
Switching frequency
Approvals and
standards (See Note 4)
Material flammability
Weight
MTBF
Telcordia SR-332
@ 25 °C, 100% load
ground benign
Demonstrated
Input/output
Input/baseplate
Fixed
See table
1500 Vdc
1500 Vdc
400 kHz typ.
EN60950 (TÜV Rheinland)
UL/cUL1950
UL94V-0
73 g (2.6 oz)
1,598,243 hours
>2,000,000 hours
60 mV pk-pk
20 mV rms
6% max. deviation
150 µs recovery to
within total error band
ENVIRONMENTAL SPECIFICATIONS
Thermal performance
Operating baseplate -40 °C to +100 °C
temperature
Non-operating
-40 °C to +125 °C
Active high remote ON/OFF
Logic compatibility
ON
OFF
Undervoltage lockout
Start-up time
(See Note 6)
Power up
Power down
Power up
Remote ON/OFF
File Name: exb250s.pdf Rev (02): 06 Dec 2005
EMERSON-NETWORKPOWER [ EMERSON NETWORK POWER ]
