Bus Converter
48V Input / 12V Output / 27A
07CM-27S12L
PRELIMINARY
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Ideal for Intermediate Bus Architectures
Industry standard quarter-brick package
Up to 300W at 95% efficiency
1500V isolation
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Safety Agency Approvals
Description
The 07CM-27S “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 300W of
output power from a 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
Input Voltage
Max. Output
Current
27A
Max. Output
Power
Typical
Efficiency
95%
Model Number
48V
300W
07CM-27S12L
Input Specifications
Parameter
Min
Typ
Max
55 VDC
Notes
Input Voltage Range
Input Current (no load)
Input Current (full load)
Reflected Ripple Current
(pk-pk)
36 VDC
110mA
6.82A
50mA rms
100mA pk-pk
with a 12uH source inductor
at nom. Vin and full load.
Undervoltage Lockout
Turn-on
Turn off
35.8 VDC
33.8 VDC
57.1 VDC
Overvoltage Lockout
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage
36Vin
8.7V
11.7V
13.3V
Setpoint at no load.
48Vin
55Vin
Output Current
Output Power
Load Regulation
Ripple and Noise
0A
27A
300W
0.4V
150mV pk-pk
0 to 20MHz Bandwidth
Use 1.0uF ceramic cap and
100uF/50mOhm tantalum on
output
Load Capacitance
100uF
3000uF
(50mohm)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
