OBS DC-DC Series Data Sheet
Features
• Industry-standard package
• 24 and 48V input versions
• 25W output power
• 100°C baseplate operation
• Trim and enable pins
• Fixed frequency
• 1500V isolation
• 6-sided shielding
Description
OBS single output dc-dc converters provide up to 25 watts of output power in an industry-standard package and
footprint. The OBS units feature excellent efficiency, six-sided shielding, and fixed switching frequency. With 100°C
case operation, the OBS converters are especially suited to telecom, networking, and industrial applications. These
units are 100% surface-mount construction and fully-compatible with production board washing processes.
Efficiency vs. Load (24V Input)
Technical Specifications
95
Input
90
Voltage Range
24 VDC Nominal
48 VDC Nominal
Reflected Ripple
Input Reverse Voltage Protection
18 - 36 VDC
34 - 75 VDC
25 mA
Shunt Diode
85
80
75
70
65
EFF. OBS025YG
EFF. OBS025YH
EFF. OBS025YJ
Output
10
20
30
40
50
60
70
80
90
100
Setpoint Accuracy
±1%
Line Regulation V Min - V Max., I
Rated
0.2% V
0.5% V
LOAD %
in
in
out
out
Load Regulation I
Minimum Output Current
Min. - I
Max., V Nom.
out
out
in
out
10 % I
Rated
25% I
4% V
out
Dynamic Regulation, Loadstep
Pk Deviation
Settling Time
Efficiency vs. Load (48V Input)
out
out
500 ms
95
90
85
80
75
70
65
60
55
Voltage Trim Range
±10% I
Rated
out
Short Circuit / Overcurrent Protection
Current Limit Threshold Range, % of I
OVP Trip Range
Hiccup
110 - 140%
115 - 140%V Nom.
Rated
out
out
OVP
Hiccup
EFF. OBS017ZE
EFF. OBS025ZG
EFF. OBS025ZH
General
Turn-On Time: 24 & 48V
10 ms
Positive
Negative
400 kHz
in
Remote Shutdown
Remote Shutdown Reference
Switching Frequency
Isolation
10
20
30
40
50
60
70
80
90
100
V
in
LOAD %
Input - Output
Input - Case (24 V units)
1500 VDC
500 VDC
500 VDC
0.03%/°C
Notes
MTBF predictions may vary slightly from model to model.
in
Output - Case (48 V units)
in
†
Temperature Coefficient
Case Temperature
Specifications typically at 25°C, normal line, and full load, unless otherwise
stated.
Operating Range
Storage Range
-40 to +100°C
-40 to +125°C
95%
Humidity Max., Non-Condensing
Vibration, 3 Axes, 5 Min Each
Soldering Conditions: I/O pins, 260°C, ten seconds; fully compatible with
commercial wave-soldering equipment.
5 g, 10 - 55 Hz
6
†
MTBF (Bellcore TR-NWT-000332)
1.8 x 10 hrs
Units are water-washable and fully compatible with commercial spray or
immersion post wave-solder washing equipment.
Safety
Weight (Approx.)
UL, cUL, TUV
1.9 oz
REV. JUN 04, 2004
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