LM5113 clamping circuit

Zichao Ye

Other Parts Discussed in Thread: LM5113

Hello,

I'm a graduate student doing research about GaN gate drivers. I want to know slightly more details about the clamping circuit in LM5113.

Is it a zener diode or a LDO?

Thank You!

over 9 years ago

0 Alberto Doronzo over 9 years ago

TI__Expert 4850 points

Hi Zichao,

the clamping circuit on the LM5113 is similar to an LDO.

Regards,

Alberto

0 Zichao Ye over 9 years ago in reply to Alberto Doronzo

Prodigy 30 points

Thank you Alberto! I have another question about the low side gate driver.

On the data sheet it says the maximum VDD of LM5113 is 7 V. However, EPC's data sheet says the maximum Vgs of their GaN is 6 V.

My question is that does LM5113 have a clamping circuit for the low side VDD?

If I apply 7 V to the VDD, does the gate see 7 V directly, or it is clamped to 6 V or so?

Thanks,

Zichao

0 Alberto Doronzo over 9 years ago in reply to Zichao Ye

TI__Expert 4850 points

Hi Zichao,

there is not voltage clamp on the low side driver.

If you feed 7V to the LM5113 no damage will occur to it, but as soon as you turn on the low side gate the full 7V will be available. If you are driving a GaN FET rated at 6V absolute maximum you will damage it.

Regards,

Alberto

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LM5113 clamping circuit