TPS51215A: schematic check

GARETH OU

Mastermind 9395 points

Part Number: TPS51215A

There is a problem that POWER GOOD when booting up, but not HIGH,

could you help check the below TPS51215 schematic and any need to adjust

Thanks

tps51215.pdf

over 1 year ago

0 Xueliang Zhang over 1 year ago

TI__Expert 4360 points

I will check it and give you a feedback next Monday.

0 Xueliang Zhang over 1 year ago

TI__Expert 4360 points

Hi Gareth

The schematic looks ok, could you check the output voltage and the VSNS pin voltage? Is VSNS at 92%-108%*Vout or 84%-116%*Vout? actually the PG internal comparator detects the VSNS pin, could you help check the Vout and VSNS voltage?

xueliang

0 GARETH OU over 1 year ago in reply to Xueliang Zhang

Mastermind 9395 points

Hi Xueliang

Coulu you see the picture( ch 1 Vout , ch2 Power good). The power drop at booting up.

I think it in UVP . Why does it have Vout in the protection?

P1. Pass

P2. Fail

0 Xueliang Zhang over 1 year ago in reply to GARETH OU

TI__Expert 4360 points

Hi Gareth

I will check it on EVM and give you a feedback later today or next Monday.

xueliang

0 Xueliang Zhang over 1 year ago in reply to GARETH OU

TI__Expert 4360 points

Hi Gareth

The UVP trigger has a 1ms deglitch time, and there is no time scale in the waveform, it cannot judge. I can't duplicate this phenomenon on EVM. Could you help to capture the SW waveforms for further analysis? zoom in and zoom out waveforms, it includes three signals of sw, vout and PG. thanks!

xueliang

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TPS51215A: schematic check