Hello to all
We are trying to use an ADN8831 to drive a TE-module with up to 4V/4A, but it always turns off at ~3A (!standby-pin going low).
The circuit we're using is more or less the same as the eval board, except AVDD is connected via a 1Ohm (1.5kOhm@100MHz) bead to DVDD.
Because I put in a filter after the power supply the supply voltage drops ~250mV until the ADN8831 goes into standby mode (see attached "TEC2 Plots.png").
What causes !SB to go low? Is there some way to stop this behaviour?
Also is there maybe a replacement for the ADN8831 without the opamps built in? A (voltage controlled) H-bridge controller with similar behaviour?
Thanks for your help.
EDIT: I set the current limit a bit lower, now it looks like the "TEC2 fail.png" attachment. (-> the problem doesn't seem to be the voltage drop).