UCD90320: shutdown sequence not follow configuration

Ben Kuo

Part Number: UCD90320

Dear expert,

I set rail#25 shutdown dependent on rail#9. But rail#25 always be shutdown before rail#9.

I have check enable signal and make sure #25 always be turn down before #9. Which means rail be turned down by UCD90320.

May I learn from you what is the root cause?

Regards,

Ben

Regards,

Ben

0 yihe 1 month ago

Please make sure that there is mistake on the schematics and we have been seeing this kind of error from many customers

please have a capture include: AMON09, EN10, DMON01, EN08.

Regards

Yihe

0 Ben Kuo 1 month ago in reply to yihe

Hi Yihe,

We have measure AMON09/EN10/DMON01/EN08 and set "RAIL25 Turn Off Dependent on RAIL9 Delay 20ms".

But rail#25 and #9 are be turn off at same time without delay.

Regards,

Ben

0 yihe 1 month ago in reply to Ben Kuo

How did you trigger the shutdown event in the captured waveform?

If you are using control_pin, then both 25 and 9 will shutdown at the same time since you configure to shutdown immediately.

Regards

Yihe

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