Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302

• Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

Bus Converter

48V Input / 12V Output / 20A

• Ideal for Intermediate Bus Architectures

• Industry standard quarter-brick package

• Up to 240W at 96% efficiency

• 1500V isolation

• Remote on/off

• Low cost

• Safety Agency Approvals

Description

The 07CM-20S “Cimarron” Series are isolated DC/DC converters that operate from a nominal 48V source.

These converters are intended to provide isolation and step down to generate an intermediate bus for the

purpose of powering non-isolated Point-of-Load (POL) converters. These units will provide up to 240W of

output power from a nominal 48V input. These units are designed to be highly efficient and very low cost and

are thus unregulated. The downstream POL converters will provide the precise regulation required by the load.

Features include remote on/off, over current protection and undervoltage lockout. These converters are

provided in an industry standard quarter-brick package.

Part Selection

Output

Voltage

Input Voltage

Max. Output

Current

Max. Output

Power

Typical

Efficiency

Model Number

12V

48V

20A

240W

96%

07CM-20S12L

8V

48V

30A

240W

96%

07CM-30S08L

Change last character in part number from “0” to “H” for Active High On/Off Logic (e.g. 07CM-20S12H)

Input Specifications

Parameter

Min

Typ

Max

Notes

Input Voltage Range

36 VDC

55 VDC

Input Current (no load)

80mA

Input Current (full load)

5.3A

Reflected Ripple Current

(pk-pk)

50mA rms

100mA pk-pk

Reflected ripple current

through a 12uH source

inductor at nominal input

voltage and rated load

current.

Output Specifications

Parameter

Min

Typ

Max

Notes

Output Voltage

07CM-20S12x

07CM-30S08x

36V in

8.8V

5.8V

48V in

12.0V

8.0V

55Vin

14.0V

9.4V

Setpoint at no load.

Output Current

07CM-20S12x

07CM-30S08x

0A

0A

20A

30A

Load Regulation

5%

Ripple and Noise

100mV pk-pk

45mV rms

0 to 20MHz Bandwidth

Use 1.0uF ceramic cap and

15uF/100mOhm tantalum on

output

07CM-20S/30S Series

PRELIMINARY