Rise and fall time of the signal input into EN of TPS54327

takahiko yokota

Mastermind 7135 points

Other Parts Discussed in Thread: TPS54327

As long as I read the datasheet of TPS54327, this devise isn't written the rise and fall time of signal to control EN.

Is the signal input into EN defined those time?

Best regards,

Yokota

over 9 years ago

0 JohnTucker over 9 years ago

TI__Guru**** 191445 points

I don't think there is any particular restriction. There is some hyteresis on the input to account for particularly slow rise and fall times.

0 takahiko yokota over 9 years ago in reply to JohnTucker

Mastermind 7135 points

Thank you for the answer.
My customer will input the signal into EN when the rise time is max 5ms and the fall time is max 70ms.
Can they use TPS54327 this condition?

Best regards,
Yokota

0 JohnTucker over 9 years ago in reply to takahiko yokota

TI__Guru**** 191445 points

the times seem somewhat long. Usually they are digital signals with faster edges. I do not support TPS54327 directly though. What circuit makes the rising and especially the falling edge so slow?

0 takahiko yokota over 9 years ago in reply to JohnTucker

Mastermind 7135 points

The fall time is slow because there isn't the circuit to discharge in front of the EN.

Best regards,

Yokota

0 Zhao Ma over 9 years ago in reply to takahiko yokota

TI__Genius 15135 points

Generally speaking, we just care about the amplitude of EN signal, so I think there is no problem when EN signal has slow rising and falling time.

Zhao

Power management

Power management forum

Rise and fall time of the signal input into EN of TPS54327