Hi team,
I have one question about the Power Good connection of TPS54394.
In our EVM, PG1, PG2 are pulled up through 100k resistor to VREG. I think this is because the PG1,PG2 max voltage is 5.7V. Is that right?
If my input voltage is 5.5V, can I pull up PG1, PG2 through 100k resistor to Vin(5.5V) directly?
Thanks,
Will
Hi Vental,
Thanks for reply. And I did a experiment use our tps54394 EVM, just as you say, I connect PG to Vin with 100k resistor. Get the below waveform.
1: Vin; 2:Vout2; 3:VREG; 4:PG2.
PG2 is a small spike, so could you tell me why their is a spike? And if I change the pull up resistor, the spike could be higher? For if customer wants to use PG to achieve power-on sequence control, the spike level must be considered.
I use the EVM for test, and PG1 is connected to VREG. There is no spike.
However the customer connect PG1 to Vin, and max Vin is 5.5V. So there is a spike in PG1. They want to know why there is a spike? And if the pull up resistor will influence the spike amplitude.
