LSF0101 VrefB and EN power source

user4760726

Hi team,

One of customers wants to know whether it is possible to use two power sources (two 5Vs) to connect VrefB and EN separatly with its own Pull-ups? like the picture below. Please advised,

Note: EN_PW and VrefB turn on sequentially( not on the same time)

Leroy

over 7 years ago

0 ShreyasRao over 7 years ago

TI__Guru 55970 points

Hi ,
what is the application which uses same rail to power both en and vrefB and uses 2 separate resistors?
200k isn't necessary for the en input since they are high impedance , however , the translation doesn't maintain the expected behavior.

0 ShreyasRao over 7 years ago in reply to ShreyasRao

TI__Guru 55970 points

I just did some basic simulation and with EN rail at 5V , the gate will be at 5V and the 0 to 1.8V square wave doesn't cross the cutoff threshold and the output will remain at ~1.9V at the output which is not desired.

Logic

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LSF0101 VrefB and EN power source