# What is the standard way to make a Peltier power supply with variable power? [duplicate]

Possible Duplicate:
How to drive a Peltier element?

I want to control a few Peltier using MCU. I think the easiest way is using PWM, but I feel that the efficiency is very low and It maybe will damage the Peltier.

Does anyone know what is the standard way to make a Peltier power supply with variable power?

## marked as duplicate by Olin Lathrop, stevenvh, KortukAug 5 '12 at 13:16

Using my favourite entry level smps IC, the MC34063, you can build a suitable buck converter for probably $1 to$2 US. Fig 11 / 11A / 11B in the MC34063 data sheet show circuits for step down. You would want to convert these to constant current output and select the desired current to suit.