1

Powering Communications and Technology

55

60

65

70

75

80

85

90

95

10

20

30

40

50

60

70

80

90

100

LOAD %

EFF. OBS017ZE

EFF. OBS025ZG

EFF. OBS025ZH

Efficiency vs. Load (48V Input)

65

70

75

80

85

90

95

10

20

30

40

50

60

70

80

90

100

LO AD %

EFF. OBS025YG

EFF. OBS025YH

EFF. OBS025YJ

Efficiency vs. Load (24V Input)

• Trim And Enable

Pins

• Fixed Frequency

• 1500V Isolation

• 6-Sided Shielding

DESCRIPTION

FEATURES

OBS SERIES

25 WATT

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.

• Industry standard package

• 24 and 48V input versions

• 25W output power

• 100°C baseplate operation

General

Turn-On Time: 24 & 48Vin

10 ms

Remote Shutdown

Positive

Remote Shutdown Reference

Vin Negative

Switching Frequency

400 kHz

Isolation

Input - Output

1500 VDC

Input - Case (24 Vin units)

500 VDC

Output - Case (48 V in units)

500 VDC

Temperature Coefficient

0.03%/°C

Case Temperature

Operating Range

-40 to +100°C

Storage Range

-40 to +125°C

Humidity Max., Non-Condensing

95%

Vibration, 3 Axes, 5 Min Each

5 g, 10 - 55 Hz

MTBF† (Bellcore TR-NWT-000332)

1.8 x 106 hrs

Safety

UL, cUL, TUV

Weight (Approx.)

1.9 oz

TECHNICAL SPECIFICATIONS

Input

Voltage Range

24 VDC Nominal

18 - 36 VDC

48 VDC Nominal

34 - 75 VDC

Reflected Ripple

25 mA

Input Reverse Voltage Protection

Shunt Diode

Output

Setpoint Accuracy

±1%

Line Regulation Vin Min - Vin Max., Iout Rated

0.2% Vout

Load Regulation Iout Min. - Iout Max., Vin Nom.

0.5% Vout

Minimum Output Current

10 % Iout Rated

Dynamic Regulation, Loadstep

25% Iout

Pk Deviation

4% Vout

Settling Time

500

µs

Voltage Trim Range

±10% Iout Rated

Short Circuit / Overcurrent Protection

Hiccup

Current Limit Threshold Range, % of Iout Rated

110 - 140%

OVP Trip Range

115 - 140%Vout Nom.

OVP

Hiccup

Notes

† MTBF predictions may vary slightly from model to model.

Specifications typically at 25°C, normal line, and full load,

unless otherwise stated.

Soldering Conditions: I/O pins, 260°C, ten seconds; fully

compatible with commercial wave-soldering equipment.

Units are water-washable and fully compatible with commercial

spray or immersion post wave-solder washing equipment.