DRV8702D-Q1: Current Regulation

Sadanori Kato

Part Number: DRV8702D-Q1

Hi,

Please tell me how to set the current regulation. Is my understanding correct that the DRV8702D-Q1 needs to be set as follows?

Setting the current regulation :
- Add the current sensing resistor between SP and SN
- Add two resistors between AVDD and GND and setting the reference voltage to VREF
- MODE is kept floating(Hi-Z)

What is the reason why the current isn't chopped if the above procedure is applied to DRV8702D-Q1?

Best regards,
Kato

over 4 years ago

0 Wang5577 over 4 years ago

TI__Guru 56650 points

kato-san,

Do you use an EVM or a customer board?

If you use an EVM, please follow the user's guide (http://www.ti.com/lit/ug/slvuaw2/slvuaw2.pdf ) and tell me when you set different INx duty cycle, do you get different current at output? I would think this process would help you find the root cause.

If you use a customer board, please compare the schematic first. And then, follow the EVM's user's guide to setup the board connection and pin setting; check you set different INx duty cycle, do you get different current at output?

0 Sadanori Kato over 4 years ago in reply to Wang5577

Guru 36490 points

Hi Wang-san,

Thank you for your prompt reply.

I will review customer's schematic and get back to you.

Best regards,
Kato

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DRV8702D-Q1: Current Regulation