DRV8245S-Q1LEVM: Why there is a PWM drop during the PWM mode control?

Matthew Chen

Part Number: DRV8245S-Q1LEVM

Hi Team,

When testing the DRV8245S-Q1LEVM in the PWM mode, the input voltage is 12V with no load. There will be a voltage drop in the OUT1 and OUT2. Please see the pic below. What's the reason for that?

Thanks a lot

Matthew

over 1 year ago

0 Ryan Kehr over 1 year ago

TI__Guru 54725 points

Matthew,

Do you see the same drop in your supply? That is the only idea I have for now.

Regards,

Ryan

0 Matthew Chen over 1 year ago in reply to Ryan Kehr

TI__Intellectual 1140 points

Hi Ryan,

Please see the pic, Ch4 is the Vin captured from the EVM board. It seems no drop in the power supply.

Matthew

0 Ryan Kehr over 1 year ago in reply to Matthew Chen

TI__Guru 54725 points

Matthew,

OK, is it possible for you to zoom in on those drops? Also, you mentioned there is "no load", but GUI seems to register some current. >1A peak current.

Regards,

Ryan

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DRV8245S-Q1LEVM: Why there is a PWM drop during the PWM mode control?