UCC21520: Powered from one supply

Keith Keller

Expert 7230 points

Part Number: UCC21520

Tool/software:

Hello,

Could you please let us know if it is possible to power an isolated driver only from the primary side?

Please see image below.

Thank you, Keith

4 months ago

0 Hiroki Honda 4 months ago

TI__Expert 8686 points

Hi Keith,

The concern here would be the inability to properly isolate the primary side from the secondary side.

It is possible to drive the secondary side channels with one power supply and use a bootstrap circuit if driving a half-bridge.

If this is only for the EVM for low voltage testing, then it is fine to power up all of the supply pins with one power supply.

Regards,

Hiroki

0 Keith Keller 4 months ago in reply to Hiroki Honda

TI__Expert 7230 points

Hello,

Actually we're more wondering if there is a way that we can use the switching behavior inside the IC to create a discrete external charge pump circuit?

Thank you, Keith

0 Hiroki Honda 4 months ago in reply to Keith Keller

TI__Expert 8686 points

Hi Keith,

Could you share a little more details on this application?

Is the goal to drive the charge pump switches using these gate drivers?

Regards,

Hiroki

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UCC21520: Powered from one supply