TEC controller with low ripple

Thread Starter

beandigital

Joined Jan 18, 2018
4
I have an application that uses a peltier to cool an image sensor. So I need a TEC controller but it has to be low noise. I am looking for something with around 1mV of ripple. At the moment I am using the ADN8831 but the ripple is too high. Does anyone have any recommendations?
Thanks
 

Thread Starter

beandigital

Joined Jan 18, 2018
4
Well I have around 26mV or ripple for an output current of 0.6A. I am actually using a 1.5uH inductor and 40uF of capacitor. These are the values that are used on the eval board so that is what I based them on.
 

crutschow

Joined Mar 14, 2008
34,285
Well I have around 26mV or ripple for an output current of 0.6A.
So to get 1mV of ripple you need a reduction of about 30dB.
Try L=10μH and C = 200uF.
My simplified simulations show that should get the ripple below 1mV.

Note that the capacitor needs to have a low ESR so you might try say, five 40uF low ESR capacitors in parallel.
 
Top