TPS54331: Under Volt Lockout problem.

Hi Jay

This is caused by the hysteresis of the enable threshold. 

Hope this helps.

BR

Ruby

Hello Ruby,

Thanks for the reply. Got the point. How to resolve it?

Hi Jay

Enable hysteresis is used to avoid powering on/off repeatedly when there is a little bit change on the EN voltage.

As a result, it is very common to have the different voltage of the EN on/off. Do you want to turn on/off both at 11V? That could not be achieved.

Hope this helps.

BR

Ruby

Hello Ruby,
Thanks for the quick response, But if I can make this difference a little bit lower, that will be helpful.

Hi Jay,

The EN threshold is set internally and it could not be changed.

BRs

Zixu

Hello Ruby,

I am facing another problem with UVLO, on the EN pin I am using the same value resistor for the resistor divider in different boards, but all are turning on at different voltage levels, let's say one board is turning on the TPS54331 device at 12.6V and turning off at 11.5V, now when testing in another device with same resistors and same value no tolerance, it is turning on at 12V and turning off at 11.3V. Can anyone explain why it is happening?