TPS65132S: Power up behavior of VNEG

Tiger Yeh

Part Number: TPS65132S

Hi,

According to startup diagram in the datasheet, we expcect TPS65132S VNEG output startup should be one step for its output level, but we found there are 2 steps for output.

Could you please confirm this is normal?

Thanks and Best regards,

Tiger

over 5 years ago

0 Aaron Goodson over 5 years ago

TI__Expert 6330 points

HI,

I have notified our expert regarding this topic. Please expect a response by 5/1/20.

Thanks,

Aaron

0 Liaqat Khan over 5 years ago

TI__Mastermind 18550 points

Hi Tiger,

The step plateau in VNEG seems to more than 400ms and this is not normal. Is there a heavy load on VNEG during startup? Initially, the current on VNEG is limited to 40mA or 80mA depending on the APPS bit in the device register. Only after VPOS/VNEG are in regulation is higher current limit of 150mA released for TPS65132S. So I am thinking that there is likely heavy load on VNEG during this startup that is causing the step.

Kind Regards,

Liaqat

0 Tiger Yeh over 5 years ago in reply to Liaqat Khan

TI__Expert 5635 points

Thanks for reply, Liaqat.

The part is TPS65132S, and will ask to check loading when startup.

If any update, will post here.

Best regards,

Tiger

0 Liaqat Khan over 5 years ago in reply to Tiger Yeh

TI__Mastermind 18550 points

Thanks Tiger.

Kind Regards,

Liaqat

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TPS65132S: Power up behavior of VNEG