UCC21530: Quiescent current while EN=GND

Hi Ohad,

This is not a spec that we test in this product family.

Is this a spec that is important to the customer?

Would you be able to give some background on why it is important? This will be helpful feedback for us.

Thank you!

Regards,

Hiroki

Hi Hiroki, 

We are looking for the EN=GND info for the following case:

Before the PWM controller wakes up we want to know how much current is drawn from the other components to know how to design our startup circuit.

would it be possible to come up with some numbers either for the UCC21530  / UCC21551 

Hi Ohad,

Thanks for the details!

I am able to measure some values in the lab but it would not be recommended to be used as a reference for the customer's system since it would not take into consideration any corner cases.

However if this seems helpful, I can measure some values on a few units.

Regards,

Hiroki

we understand that corner cases will not be taken into account but this information will be very helpful for us. 
i would appreciate if this is something we can do 

Hi Ohad,

I will get back to you with the measurements soon this week.

Thanks!

Regards,

Hiroki

This is indeed helpful since I wanted to know if it acts in shutdown mode when EN is pulled low (such as some HB drivers as UCC27282).

Now I need to figure out how to disconnect the isolated driver VCC during the flyback startup and enable it when the startup capacitor reached my controller UVLO.