Bus Converter
48V Input / 140W Output
07CR “Cimarron” Series
PRELIMINARY
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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
8V
Input Voltage
Max. Output
Current
18A
Max. Output
Power
Typical
Efficiency
95%
Model Number
48V
48V
140W
07CR-18S08L
07CR-12S12L
12V
12A
140W
95%
Change last character in part number from “L” to “H” for Active High On/Off Logic (e.g 07CR-18S08H)
Input Specifications
Parameter
Input Voltage Range
Input Current (no load)
Input Current (full load)
Reflected Ripple Current
(pk-pk)
Min
Typ
Max
60 VDC
45mA
Notes
36 VDC
3A
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
Unregulated output will track
input voltage with a 6:1 or 4:1
ratio.
Vin / 6
Vin / 4
07CR-12S120
Output Current
07CR-18S080
18A
12A
07CR-12S120
Load Regulation
07CR-18S080
0.5V
0.7V
07CR-12S120
Ripple & Noise
07CR-18S080
pk-pk / rms
110mV / 20mV
150mV / 40mV
0 to 20MHz Bandwidth
Use 1.0uF ceramic cap and
15uF/100mOhm tantalum on
output
07CR-12S120
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
