UCC2807-2: UCC28702DBVT

Yogendra Mahale

Part Number: UCC2807-2

I am using UCC28702DBVT in my flyback smps circuit and followed the schematic as in the datasheet, but still I am not getting any output. Please help

over 2 years ago

0 Yogendra Mahale over 2 years ago

Prodigy 20 points

0 Yogendra Mahale over 2 years ago in reply to Yogendra Mahale

Prodigy 20 points

Here is the schematic

0 JCHK over 2 years ago in reply to Yogendra Mahale

TI__Guru 50190 points

Hi Yogendra,

The schematic values are a bit difficult to read. Any capacitance on the VS pin can make it difficult for the controller to work. This should be removed.

Can you share scope plots of VDD, VS, DRV, and CS?

We have a reference design PMP8757 which is close to what you are trying to do. This could be a good reference for you to compare your design against.

I hope this helps.

0 Yogendra Mahale over 2 years ago in reply to JCHK

Prodigy 20 points

Hi Jhon,

Now I am getting 5V output.

As suggested by you I removed the capacitor from Vs pin, but got partial output.

Now I removed both the capacitor from Vs and Cs pin, and got the desired output.

Thank you for your support and help.

Regards,

Yogendra

0 JCHK over 2 years ago in reply to Yogendra Mahale

TI__Guru 50190 points

Hi Yogendra,

I am glad you got it working!

Power management

Power management forum

UCC2807-2: UCC28702DBVT