EXB50 Series
DC-DC CONVERTERS
Single output
1
20-50 W High Efficiency DC-DC Converters
•
High efficiency topology, 91% typical on EXB50-48S05J
•
Industry standard footprint
•
Wide operating temperature -40 °C to +70 °C
(natural convection)
•
60% to 110% output trim
•
No minimum load
•
Overvoltage and overtemperature protection
•
Remote sense compensation
•
Remote ON/OFF
•
Available RoHS compliant
The EXB50 series of 50 Watt single-output isolated dc-dc converters are specifically
designed to meet the power needs of low-voltage silicon. Housed in an open-frame
package with an industry-standard footprint, these latest-generation converters offer
efficiencies as high as 91%. The series comprises three 24 V input models with 5 V,
3.3 V and 2 V outputs, and six 48 V input models with 12 V, 5 V, 3.3 V 2.5 V, 2 V and
1.8 V outputs. All models feature a wide input range, trimmable output voltage and a
10 A current rating (except the 12 V). Remote sense and remote ON/OFF facilities are
included as standard, and the converters are comprehensively protected against
overcurrent, overvoltage and overtemperature conditions.
All specifications are typical at nominal input, full load at 25 °C unless otherwise stated
2 YEAR WARRANTY
SPECIFICATIONS
OUTPUT SPECIFICATIONS
Voltage adjustability
Setpoint accuracy
Line regulation
Load regulation
Total error band
Minimum load
Overshoot
Undershoot
Ripple and noise
(See Note 1)
Transient response
(See Notes 2 and 8)
5 Hz to 20 MHz
24 V models
48 V models
At turn-on and turn-off
Low line to high line
Full load to min. load
60% to 110%
±1.5% max.
0.1% max.
0.2% max.
±3.0%
0%
None
None
100 mV pk-pk
20 mV rms
3.0% peak deviation
2.0% peak deviation,
200 µs recovery to
within total error band
10% o/p voltage change
INPUT SPECIFICATIONS
Continued
Undervoltage lockout
24
24
48
48
V
V
V
V
Power
Power
Power
Power
up
down
up
down
17 V max.
15 V min.
33.2 V max.
30.9 V min.
30 ms
25 ms
Start-up time
(See Note 7)
Power up
Remote ON/OFF
EMC CHARACTERISTICS
Conducted emissions
Radiated emissions
Immunity:
ESD air
ESD contact
Radiated field enclosure
Conducted (DC power)
Conducted (signal)
EN55022 (See Note 3)
Level A
EN55022 (See Note 3)
Level B
EN55022
Level A
(See Note 13)
EN61000-4-2 8 kV (NP), 15 kV (RP)
EN61000-4-2 6 kV (NP), 8 kV (RP)
EN61000-4-3 10 V/m (NP)
EN61000-4-6 10 V (NP)
EN61000-4-6 10 V (NP)
GENERAL SPECIFICATIONS
Efficiency
Basic insulation
Switching frequency
Input/output
Fixed
See table
1500 Vdc
300 kHz typ.
IEC60950/EN60950, UL/cUL1950
CSA C22.2 No. 950
UL94V-0
50 g (1.77 oz)
MIL-HDBK-217F @ 25 ºC
100% load ground benign
270,000
hours
Remote sense
INPUT SPECIFICATIONS
Input voltage range
(See Note 14)
Input current
(See Note 9)
24 V nominal
48 V nominal
100 V 100 ms transient
24
24
48
48
V no load
V Remote OFF
V no load
V Remote OFF
18-36 Vdc
36-75 Vdc
85 mA max.
20 mA max.
60 mA max.
10 mA max.
Approvals and
standards (See Note 5)
Material flammability
Weight
MTBF
Input current (max.)
(See Note 4)
24 V models
48 V models
3.25 A max. @ Io max.
and Vin = 18-36 Vdc
1.7 A max. @ lo max.
and Vin = 36-75 Vdc
20 mA (pk-pk) typ.
50 mA (pk-pk) typ.
ENVIRONMENTAL SPECIFICATIONS
Thermal performance
(See Notes 11, 12)
ETS 300 019-2-3
Altitude
(See Note 10)
Operating ambient.
-40 °C to +70 °C
temperature (natural convection)
Non-operating
-55 °C to +125 °C
Classes T3.1 to T3.5
3,000 metres
10,000 metres
Derate max. output
current by 20%
Derate max. output
current by 50%
Input reflected ripple
(See Note 6)
Remote ON/OFF
Logic compatibility
ON
OFF
24 V models
48 V models
(See Note 15)
Open collector ref to -input
Open circuit or >2 Vdc
<1.2 Vdc
File Name: exb50s.pdf Rev (02): 05 Dec 2005
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