TPS2373: TPS2373 APD issue

Hsu cheng

Part Number: TPS2373

My customer reported that the APD PIN was short-circuited to the ground, and the TPS2373 could not work. At present, he can work after APD is open(R7 open).

Does R7 OPEN have any influence?

over 6 years ago

0 Artem Rogachev over 6 years ago

TI__Intellectual 1005 points

Hi Hsu,

I believe your issue is that you connected APD to VSS. Per the datasheet it should be connected to RTN instead. Please try this and see if it solves your issue.

We do not recommend leaving APD floating. That would make the operation sensitive to board leakage making it unreliable.

-Artem

0 Hsu cheng over 6 years ago in reply to Artem Rogachev

Expert 1565 points

Thanks, and my customer wants to know function what the APD PIN is open.

0 Artem Rogachev over 6 years ago in reply to Hsu cheng

TI__Intellectual 1005 points

Hello,

The APD has an internal 5M-ohm resistor pull down to RTN. So effectively it should have the APD = RTN, which means that the APD functionality will be disabled. However, please keep in mind that you may have noise susceptibility since the pull down is very weak (5M-ohm). In general our recommendation is to tie the APD to RTN.

-Artem

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TPS2373: TPS2373 APD issue