DRV8703-Q1: independent PWM control logic

Chuqiang Wen

Part Number: DRV8703-Q1
Other Parts Discussed in Thread: DRV8705-Q1

Hi Expert,

My customer is considering DRV8703-Q1 in new project. But have some questions need to be clarified.

The application is for door control module. There have two motors for lock, need 3 half bridges for control. There have one case for DRV8703--when one of bridges operate as PWM switching, another bridge need to operate under HiZ mode. I checked with our datasheet. For independent PWM control mode, the IN1 for half-brige 1 control, IN2 for half-bridge 2 control. I am confused if 'X' denotes HiZ or not?

Thanks!

Ethan Wen

over 3 years ago

0 Ryan Kehr over 3 years ago

TI__Guru 55605 points

Ethan,

If this is a new project, please recommend under all circumstances the DRV8705-Q1. It has a dedicated HIZ pin that can do exactly what the customer wants to do.

Regards,

Ryan

0 Chuqiang Wen over 3 years ago in reply to Ryan Kehr

TI__Expert 5825 points

Hi Ryan,

Thanks for your suggestion!

This project will not do the schematic/layout change. So we still need your confirm for DRV8703.

Regards,

EthanWen

+1 Ryan Kehr over 3 years ago in reply to Chuqiang Wen

TI__Guru 55605 points

Ethan,

That is exactly why I recommended the DRV8705-Q1. In independent mode, there is no way on the DRV8703-Q1 to independently HIZ. You can only HIZ ALL channels with nSLEEP as the truth table shows.

Regards,

Ryan

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DRV8703-Q1: independent PWM control logic