I'm putting this up here out of interest, in my pursuit of a linear MOSFET driver circuit. This is a copy of a power LED dimmer with a few additional components on the TEC side.
I've been reading about Trench MOSFETs and the capability to run linear. All I have done here is smooth things out - naively, possibly. This works over a range of PWM frequencies. Some component values need adjusting otherwise.
3R resistor is the TEC.
The 5R resistor prevents reverse current in the TEC at start up - 1.67uA is the current through the 2.2nf cap and resistor according to my Android app, Every Circuit.
Not sure of the heatsink requirements yet.
Here it is running at 70% duty cycle, which is typical. The Teensy board PWM output at ~3.75Mhz 0 - 5V.
http://www.candlepowerforums.com/vb/...rent-Regulator