LM73606-Q1: LM73606-Q1: Feedback pin connection after sense resistor follow-up

Francesco Ricci

Part Number: LM73606-Q1

Hello Frank,

After some simulations using the LM73606-Q1 spice model I have some follow-up question.

If the sense resistor is located immediately after the inductor it sees large current bursts which are problematic for accurate sensing and also for the sense resistor current limit.

Is it ok to have the following configuration:

Inductor -> decoupling capacitors -> sense resistors -> more decoupling capacitors -> load

Can I trust the LM73606-Q1 spice model to accurately represent waht I want to do?

Note: I must use the regulator in forced PWM

Thank you

over 6 years ago

0 Frank De Stasi over 6 years ago

TI__Guru 72995 points

I think that the configuration you stated is correct. The voltage FB would be taken from the first set of caps after the inductor.
I would not trust too much in the spice model, it is very basic; testing on a prototype is always best.
You can order an EVM from TI to test your application.

0 Francesco Ricci over 6 years ago in reply to Frank De Stasi

Intellectual 350 points

Hello Frank,

I was not vary clear. I need to take the voltage FB on the second capacitor bank (after the sense resistor) to compensate on the voltage drop across the sense resistor. Is this acceptable?

Is it possible to configure your eval board to replicate my design?

Thank you

Francesco

0 Frank De Stasi over 6 years ago in reply to Francesco Ricci

TI__Guru 72995 points

I think that would be OK as well.
You would need to hack a little on the EVM but it should be possible.

0 Francesco Ricci over 6 years ago in reply to Frank De Stasi

Intellectual 350 points

Thank you for your help.

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LM73606-Q1: LM73606-Q1: Feedback pin connection after sense resistor follow-up