Bus Converter
48V Input / 12V Output / 20A
07CM-20S/30S Series
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PRELIMINARY
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
12V
8V
Input Voltage
48V
48V
Max. Output
Current
20A
30A
Max. Output
Power
240W
240W
Typical
Efficiency
96%
96%
Model Number
07CM-20S12L
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
Input Voltage Range
Input Current (no load)
Input Current (full load)
Reflected Ripple Current
(pk-pk)
Min
36 VDC
Typ
Max
55 VDC
80mA
5.3A
50mA rms
100mA pk-pk
Notes
Reflected ripple current
through a 12uH source
inductor at nominal input
voltage and rated load
current.
Output Specifications
Parameter
Output Voltage
07CM-20S12x
07CM-30S08x
Output Current
07CM-20S12x
07CM-30S08x
Load Regulation
Ripple and Noise
Min
36V in
Typ
48V in
Max
55Vin
Notes
Setpoint at no load.
8.8V
5.8V
0A
0A
12.0V
8.0V
14.0V
9.4V
20A
30A
5%
100mV pk-pk
45mV rms
0 to 20MHz Bandwidth
Use 1.0uF ceramic cap and
15uF/100mOhm tantalum on
output
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
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Tel 201-432-0463
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Fax 201-432-9542
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www.belfuse.com
BEL [ BEL FUSE INC. ]
