DRV8350: DRV8350

hiram zou

Part Number: DRV8350

Dears

with DRV8350SRTVR drive Motor, VDRAIN / VM =48V

MCU send cmd to drive motor,when working at a high current (about several second, VCP =57V), the driver occur return GDUV error ,and motor stop(VCP=47.2V)

Reset power , GDUV error would return again when MCU send drive cmd (this time motor could not run anymore, and VCP=47.2V). Have no found any resistance abnormal at 8350 chip

By this phenomenon， could you give me any suggestions?

Thanks

Hiram

over 4 years ago

0 Michael Arrant over 4 years ago

TI__Expert 3535 points

Hi Hiram,

Thanks for posting on the MD forum.

Can you please share your schematic so I can further help you debug? Also, what IDRIVE setting are you using?

Thanks,

Michael

0 hiram zou over 4 years ago in reply to Michael Arrant

Prodigy 30 points

Hi Michael

thanks for reply!

IDRIVE working at default setting, from datasheet the drive strength are IDRIVEP=1000mA / IDRIVEN=2000mA

Schematic as below pictures, the picture 1 shows DRV8350 chip config and picture 2 shows motor drive interface ( Phase A/B/C are all same . while NC means the component not mounted)

Further more, we have measure the GDUV error damaged chip , VGLS pin ref GND resistance is about 120K， while normal is 850K

Picture 1

Picture 2

0 hiram zou over 4 years ago in reply to hiram zou

Prodigy 30 points

Hi Michael

picture1 is VGLS pin waveform when GDUV error occured，have a drop to 5.25V

picture 2 is VGLS after power reset, MCU send drive motor cmd again，it can not pump to 14~15V voltage level anymore.

Picture 1

picture 2

0 Matt Hein over 4 years ago in reply to hiram zou

TI__Mastermind 21805 points

Hi Hiram,

This looks like the same schematic as in Annie's question: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1000951/drv8350-gduv-error

I have some things for you to try:

You should not be using IDRIVE source greater than 100 mA based on the rating of these MOSFETs (see this FAQ)
The VGLS capacitor is grounded to GND, not PGND. VGLS needs to be grounded to PGND since that is the same GND as VM and the MOSFETs. DRV8350 GND pin (30) should also be tied to PGND.
How are GND and PGND connected on the PCB? I recommend the connection be as close to the DRV8350 as possible.

Thanks,

Matt

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DRV8350: DRV8350