3.13.1 Digital-Side Power Supplies

From the high-voltage power input, it is necessary to convert to the +12V used by the fans and the TC1413N MOSFET gate driver. To do this efficiently, a MCP16363 Buck Converter was used. The MCP16363 has a maximum input rating of 48V, providing a wide range of operating conditions. Next, a +5V rail for the digital logic and analog circuits is needed. Since the +5V rail does not pull a lot of current, an MCP1754S fixed output linear regulator was used to convert the +12V rail to +5V. The diagram below shows how power is distributed.

Figure 3-11. Power Distribution Network

Note: The Peltier power input is separate from the digital power input. In this example, the same power supply is used for both, but they can also be separated.