UCC28070: About Start up sequence

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Guru 21045 points

Part Number: UCC28070

Hi Team,

I understand that UCC28070 can operate after VCC is stable.

Could you please let us know if you have other sequence (or concern)?

I must wait 1ms after VCC is stable etc.

Regards,

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0 John Griffin1 over 5 years ago

Hello Hide,

The UCC28070 starts operating as soon as the UVLO is exceeded on VCC

This causes the SS pin to charge and pwm to increase.

If VCC is not stable then something else is happening in your system and it is best to fix this before starting up the pfc.

That is the only issue that I can see .

Regards

John

0 Hide over 5 years ago in reply to John Griffin1

Guru 21045 points

Hi John-san,

I understand. Thank you very much.

Regards,

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