|
PCI-104 Power Supply for Men Mikro PP01
Requirements:
The power supply has the following specifications:
- 12v or 24v Supply (US or European Vehicle Voltage levels)
- 3.3v output @ 900mA
- 5v output @ 100mA
- Follows the PC/104+ specification for board size and interface header
- Reverse voltage protected
Design:
This design is centered around the L497x family of switching voltage regulators from ST Microelectronics. This family of regulators has several features that are advantageous in this application:
- Wide 8v to 55v input range
- -40˚ to +150˚C temp range
- Integrated thermal shutdown
- High efficiency
- RoHS available (E-L497x)
- Limited external components to fail
- Output current from 1A (L4976), 1.5A (L4971), and 2.0A (L4978)
- Identical pinouts between different versions
- 8 pin DIP package, or 16 pin SOW
The use of this regulator provides a platform that is well suited to a trucking environment. The addition of a diode to the circuit provides reverse voltage protection up to 90v.
RoHS:
All components used in this design have been chosen for their RoHS compliance. In the case of the voltage regulator (L497x), a RoHS alternative is available, albeit potentially difficult to acquire. If needed however, this part may be sourced and used in the production product, as it is a drop in replacement for the non-RoHS compliant part.
|
