I need to drive a Peltier element for thermal stabilization. Typically they are driven by a linear source and it's even recommended to do it that way. I did use MAX1968 as a bipolar driver, but that has a few drawbacks - hardware PID controller is fixed so there's very little room for thermal load variations; limited current/voltage. So I decided to try out driving an H-bridge with PWM and LC filter. While looking at PWM module in STM32F429 I noticed an interesting "complimentary" feature. I tested it out and here we go.