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DRV8706S-Q1EVM:Sample and Hold function inquiry

JUNGWON KIM
Prodigy 70 points
Part Number: DRV8706S-Q1EVM
Other Parts Discussed in Thread: DRV8706-Q1

I am using the DRV8706S.

The output is controlled by the PWM signal of the MCU.

A shunt resistor is used to measure the load current.

I want to maintain the Vso value until the next PWM signal by using the Vso output SAMPLE AND HOLD.

Register setting is completed. The datasheet said I had to put a capacitor on it.

How should I mount the capacitor? (H/W Design)

And what value of capacitor should I put on it?

 

  • 0
    TI__Mastermind 45075 points

    Hi,

    Thank you for your interest in DRV8706-Q1. As you mentioned, Vso pin needs capacitor (and resister) to hold. It also depend PWM frequency, however could you try with this?

    -RC 2KHz. e.g  R=~800ohm  C=~100nF . As Datasheet described, the capacitor be after a series resistor in a RC filter configuration. RC 2KHz is example for 500Hz switching PWM.

    regards

    Shinya Morita