UCC21520: as high side and low side driver with simulataneous operation

Ragasudha C P

Part Number: UCC21520

Can I use this Driver UCC21520 to drive one high side MOSFET and another low side MOSFET, but they are not to be operated in complimentary mode as in half bridge converters.( simulataneous operation)

over 4 years ago

0 Jacob Cohen over 4 years ago

TI__Prodigy 130 points

Hello Ragasudha C P,

Yes, you are able to use UCC21520 in order to drive the high side and low side MOSFETs in the way you describe. Many of the application schematics on the data sheet show half-bridge applications, however the high side and low side outputs are independent of each other, therefore you are able to drive two separate gates.

If you are interested in sending over your schematics we would be happy to confirm that the UCC21520 would work in your application.

Thanks,

Jacob Cohen

0 Ragasudha C P over 4 years ago in reply to Jacob Cohen

Prodigy 10 points

Hello,

Thank you very much for your reply.

My circuit is a non isolated coupled inductor based converter,as shown below

Hope I can use the driver 21520 for the Switches S1 and S2 , for simultaneous operations.

Planning to use another 21520 for S3 and D2 which will be replaced by a MOSFET as two high side drivers.

Could you please check the feasibilty.

0 Jacob Cohen over 4 years ago in reply to Ragasudha C P

TI__Prodigy 130 points

Hello Ragasudha C P,

I was wondering if you are planning to use a bootstrap supply or two isolated voltage supplies to supply voltage to the high side switches in both of the cases you mentioned above. The configurations should both work but it is important to understand how you are supplying VDDA and VDDB for these devices.

Additionally, feel free to scan the datasheet (https://www.ti.com/lit/gpn/ucc21520) to see bootstrap component recommendations (pg. 28) along with some bootstrap circuitry in applications.

Thanks,

Jacob Cohen