TPS92515: Adding a SHUNT FET

Nicholas Burczyk60

Prodigy 130 points

Part Number: TPS92515
Other Parts Discussed in Thread: PMP15022

I am adding a shunt fet option to the existing design basing it on PMP15022 project.

I am not quite sure if my implementation is correct. Would it be possible if anyone could confirm that?

over 6 years ago

0 Clinton Jensen over 6 years ago

TI__Mastermind 25500 points

Hello Nicholas,

As long as you have a PWM signal driving U12 it looks correct. You will need Roff resistors however, refer to the datasheet regarding how to set the values (you will need two, one from Vout and one from VCC). PMP15022 shows this, but your values may be different depending on if you need a different switching frequency or not.

Regards,

Clint

0 Nicholas Burczyk60 over 6 years ago in reply to Clinton Jensen

Prodigy 130 points

Hi Clint,

Thank you for your help.

Do I understand you correctly I need a PWM connected to U12? Same PWM that is driving U11? or can I drive it via U11 PWM connection (not shown on the schematic).

Kind Regards,

Nicholas

0 Nicholas Burczyk60 over 6 years ago in reply to Nicholas Burczyk60

Prodigy 130 points

What I mean is can I do something like this:

0 Nicholas Burczyk60 over 6 years ago in reply to Nicholas Burczyk60

Prodigy 130 points

hi Clint,

ok i finally got it.

thanks for all your help.

i did not understand what shunt fet really meant

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TPS92515: Adding a SHUNT FET