TIDA-00774: functionality of using R27, R29 and R32

YUSUF YASA

Part Number: TIDA-00774
Other Parts Discussed in Thread: DRV8323

Hello,

I am trying to understand the functionality of using R27, R29 and R32 in TIDA-00774 application note page-2. Normally, I would connect INHx directly to MSP430 IC.

Thanks.

over 1 year ago

0 Jenson over 1 year ago

TI__Intellectual 2235 points

Hi YASA,

In fact, this is a low-pass filter composed of RC to avoid some noise in PWM. Not used in this design.

Thanks

Jenson

0 YUSUF YASA over 1 year ago in reply to Jenson

Prodigy 10 points

Hello Jenson,

Thank you for your fast response. I did not see Capacitors on the same design. Moreover, they do not put these resistors to all 6 gate signals. That is why, I confused :)

0 Jenson over 1 year ago in reply to YUSUF YASA

TI__Intellectual 2235 points

Hi YASU,

Sorry for my misreading, the RC I was referring to was R25/C46. For this design, support 1xPWM mode, so we can use HA , HB,HC input to DRV8323, that's why we put R25/C46.... in here, and also when we use 1xPWM mode we need to disconnect pwm to INHx, so that why we put R27/R29/R32 here,when use 1xPWM mode, we can remove the pwm control for these pins.

I hope this help.

Thanks

Jenson

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TIDA-00774: functionality of using R27, R29 and R32