DRV8601: PWM Frequency and Rms 1.8V haptic driving

Part Number:DRV8601

Hi everyone,

I am developing haptic driver and using LRA .

I couldn't see any information about the frequency of pwm in datasheet. Resonance frequency of the LRA i used is 235Hz. I apply pwm with a symmetric changing duty at a 1/2 resonance frequency. (datasheet page:8 ) (Ex: %25duty at 1/470Hz , %75 at 1/470Hz   ------>   Pwm frequency 1KHz ).

 What is the most suitable pwm frequency?

Working voltage of the LRA i used is 1,8Vrms. When I observed the output signal, I saw an output voltage close to the VDD voltage. I understand there is no internal regulator in the DRV8601.

What should be VDD and PWM to drive this engine?

BR,

Onur