PGA900: gate driver

jinyan ma

Part Number: PGA900

hello:

About the PGA900, if don't use the gate driver funtion , is the gate pin necessary to connect to the GND? if let this pin float , does it have any bad influence?

I'm looking forward to your reply!

thanks and best regards

Kim

over 3 years ago

+1 Scott Cummins over 3 years ago

TI__Mastermind 31655 points

Hello Kim,

Yes, the gate drive pin must be connected to GND when the gate drive function is not used.

Regards,

Scott

0 jinyan ma over 3 years ago in reply to Scott Cummins

Prodigy 150 points

hello Scott:

thanks for your reply, I want to know if gate pin is not connect to GND, what problem will it cause?

thanks and best regards

Kim

0 jinyan ma over 3 years ago in reply to Scott Cummins

Prodigy 150 points

Hi Scott:

And I want to know how the gate driver control the VDD regulated to 3.5V? throw the below picture , when the VGS >VGSth(off),the NMOS is always on state, then the voltate at VDD pin is closely to VIN. how to it become 3.5V？

looking forward to your reply.

thanks and best regards

Kim

+1 Scott Cummins over 3 years ago in reply to jinyan ma

TI__Mastermind 31655 points

Hi Kim,

It's best to ground the GATE pin when the gate driver isn't used to avoid the possibility (although it is quite low) of damage.

At startup, VDD (source) will be briefly close to VIN, the GATE will be low, so VGS will be below the VGHth. The gate driver will then regulate the gate voltage to put VDD at 3.5V

Regards,

Scott

0 jinyan ma over 3 years ago in reply to Scott Cummins

Prodigy 150 points

Hi Scott:

Thanks for your detailed reply.I understood.

best regards

Kim

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PGA900: gate driver