If I use some like 2k/1k divisor the current becomes little high, like 4.6 ma... I need the 13.8v (car) reference... The vref needs to be together with the voltage variation of the car... what do you sugest?

About the time, I´ve tried 10ms, need more?

thanks.



Originally posted by Warrier
alejandro:

I think you need to supply the reference voltage from a low impedance source; 10k-20k may be too high which may be causing the instability.

Also, allow sufficient time for the reference chain to settle!

_warrier