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 / 140W Output

•

Ideal for Intermediate Bus Architectures

•

Industry standard eighth-brick package

•

Up to 120W at 95% efficiency

•

1500V isolation

•

Remote on/off

•

Low cost

Description

The 07CR “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 140W of output power

from a nominal 48V input with either a 4:1 or 6:1 ratio. 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 eighth-brick package.

Part Selection

Output

Voltage

Input Voltage

Max. Output

Current

Max. Output

Power

Typical

Efficiency

Model Number

8V

48V

18A

140W

95%

07CR-18S08L

12V

48V

12A

140W

95%

07CR-12S12L

Change last character in part number from “L” to “H” for Active High On/Off Logic (e.g 07CR-18S08H)

Input Specifications

Parameter

Min

Typ

Max

Notes

Input Voltage Range

36 VDC

60 VDC

Input Current (no load)

45mA

Input Current (full load)

3A

Reflected Ripple Current

(pk-pk)

10mA rms

30mA pk-pk

Reflected ripple current

through a 10uH source

inductor at nominal input

voltage and rated load

current.

Output Specifications

Parameter

Min

Typ

Max

Notes

Output Voltage Setpoint

07CR-18S080

07CR-12S120

Vin / 6

Vin / 4

Unregulated output will track

input voltage with a 6:1 or 4:1

ratio.

Output Current

07CR-18S080

07CR-12S120

18A

12A

Load Regulation

07CR-18S080

07CR-12S120

0.5V

0.7V

Ripple & Noise

07CR-18S080

07CR-12S120

110mV / 20mV

150mV / 40mV

pk-pk / rms

0 to 20MHz Bandwidth

Use 1.0uF ceramic cap and

15uF/100mOhm tantalum on

output

07CR “Cimarron” Series

PRELIMINARY