DRV8701: Clarification on IDRIVE Pin Configuration for OCP Disable

Tommy Wong

Part Number: DRV8701

Hello TI Support and Community,

I am currently working with the DRV8701 motor driver and came across what appears to be contradictory information in the datasheet regarding the IDRIVE pin configuration for disabling the Overcurrent Protection (OCP) monitor.

As per Section 7.3.6 of the datasheet, it states that shorting IDRIVE to AVDD will disable the VDS OCP monitor on the high-side FETs. The implication here is that a direct short is required for the OCP to be disabled, resulting in an IDRIVE configuration as a 25-mA source and 50-mA sink.

However, Section 8.2.3.1 of the same datasheet specifies that the designer must place a 68-kΩ resistor between the IDRIVE pin and AVDD to prevent false overcurrent detection due to the VM supply to the DRV8701 being different from the external H-bridge supply VBAT. This configuration also mentions an IDRIVE fixed at 25-mA source and 50-mA sink.

Here lies the confusion: one section suggests a direct short, while the other specifies using a resistor. Could you please clarify the correct method of disabling the OCP monitor for the DRV8701?

Thank you in advance for your assistance!

7 months ago

0 Keerthivasan Kumanan 7 months ago

TI__Genius 11245 points

Hi Tommy,

GIve me 24 hours to look into this and get back to you.

Best,

Keerthi

0 Tommy Wong 6 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthivasan,

Thank you for taking the time to look into this. I appreciate your help and am looking forward to your response. Please let me know if you need any additional information from my end.

0 Keerthivasan Kumanan 6 months ago in reply to Tommy Wong

TI__Genius 11245 points

Hi Tommy,

Thank you for your patience. I have asked the design team on the typo. I will update you as soon as I hear back. Can you tell me what application this will be used in?

Best,

Keerthi

0 Tommy Wong 6 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthivasan,

Thank you for the update and for reaching out to the design team about the documentation.

I am working on an application that requires bidirectional current control for a thermoelectric cooler. The system's operating voltage is 24V, and the working voltage for the H-bridge is supplied by a BUCK converter, which results in the DRV8701's VM (24V) being consistently higher than VBAT.

Based on the guidance in Section 7.3.6, I will initially short the IDRIVE pin directly to AVDD for testing. I will also refer to the DRV8701EVM design for guidance on using jumpers to adjust the IDRIVE pin configuration as needed.

I appreciate your assistance and am eagerly awaiting any additional information your team can provide.

Best regards,

Tommy

0 Keerthivasan Kumanan 6 months ago in reply to Tommy Wong

TI__Genius 11245 points

Hi Tommy,

what frequency are you planning on operating the TEC? Here is a FAQ on TEC:

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/967858/faq-what-motor-drivers-should-be-considered-for-driving-thermoelectric-cooling-tec-elements-or-peltier-devices

Best,

Keerthi

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DRV8701: Clarification on IDRIVE Pin Configuration for OCP Disable