BOOSTXL-3PHGANINV: High side of the phase U, V, W not responding

Pang

Part Number: BOOSTXL-3PHGANINV
Other Parts Discussed in Thread: LMG5200

Hi Ti,

There are some issues faced on high side of the phase U, V, W no response after PWM_H set to high. The Vin is 48V. The initial suspect was the bootstrap capacitor value is too high which doesn't meet the requirement. Can you help to advise?

Thanks

over 6 years ago

0 Guang Zhou over 6 years ago

TI__Mastermind 34180 points

Hi Richard,

If I understand you correctly, you were able to observe all the PWM control signals; however the inverter output is always stuck at low. Can you confirm?

I would probe around U1/2/3 (LMG5200) to make sure all the pins have expected signals:

(1) Vbus equals to 48V.

(2) Vcc equals to 5V.

(3) PWM control signals and grounds are present

In the unlikely scenario of all signals are present at the device, yet none of the phases are able to pull high, then it is possible that they are damaged and need to be replaced.

Regards, Guang

0 Pang over 6 years ago in reply to Guang Zhou

Expert 2415 points

Hi Guang,

Can you provide me your email as I have some attachments to share with you.

0 Guang Zhou over 6 years ago in reply to Pang

TI__Mastermind 34180 points

Hi Richard,

You can reach me at g-zhou@ti.com

Regards

0 Guang Zhou over 6 years ago in reply to Guang Zhou

TI__Mastermind 34180 points

Hi Richard,

Since we’re working on this topic through email, I’ll close this thread.

Regards, Guang

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BOOSTXL-3PHGANINV: High side of the phase U, V, W not responding