LM5155-Q1: How to improve gate voltage

Daniel Wang (auto)

Part Number: LM5155-Q1

Tool/software:

Hello team,

Good day!

There is a using case of LM5155-Q1, VCC is about 6V, and the gate voltage is 6V as well, but this voltage is not enough to drive MOS, so do you have methods to improve the drive voltage?

Thanks!

over 1 year ago

0 Moritz over 1 year ago

TI__Mastermind 20075 points

Hi Daniel,

Thanks for using E2E.

It is possible to supply VCC from externally. With that, the internal LDO is disabled.

When using a flyback topology for example, this can be done with an additional auxilary winding.

Best regards

Moritz

0 Daniel Wang (auto) over 1 year ago in reply to Moritz

TI__Expert 4160 points

Hello Moritz,

Thanks for your feedback.

If VCC voltage cannot be improved, is there any other methods to improve the gate driving voltage?

Best regards

Daniel

0 Moritz over 1 year ago in reply to Daniel Wang (auto)

TI__Mastermind 20075 points

Hello Daniel,

The internal gate driver voltage is limited to VCC.

What you could do is to build a external driver stage:

Best regards

Moritz

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LM5155-Q1: How to improve gate voltage