March 27, 2008
QBK025A0B DC-DC Power Modules:
36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute
stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those
given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can
adversely affect the device reliability.
Non- operating continuous
Operating Ambient Temperature
(See Thermal Considerations section)
I/O Isolation Voltage (100% factory Hi-Pot tested)
* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
Operating Input Voltage
Maximum Input Current
(VIN=0V to 55V, IO=IO, max)
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; VIN=
48V, IO= IOmax ; see Figure 9)
Input Ripple Rejection (120Hz)
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to an
integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included,
however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a
fast-acting fuse with a maximum rating of 15A (see Safety Considerations section). Based on the information provided in
this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used.
Refer to the fuse manufacturer’s data sheet for further information.