DRV8850: No output

Holly Gu

Part Number: DRV8850

Hi Team,

My customer use DRV8850, below is the SCH,

VadjG = 3V
TEC-EN-G = 5V
TEC-IN1-G=5V
TEC-IN2-G = 0.9V

But there's no output in OUT2-G & OUT1-G, voltage are both about 0.02V.

What might be the problem?

over 3 years ago

0 Madison Eaker over 3 years ago

TI__Prodigy 460 points

Hi Holly,

By connecting the inputs together, it causes the bridge to enter Hi-Z. We recommend separating IN1L, IN1H, IN2L, and IN2H.

In addition, for IN1x or IN2x to be logic low, the voltage needs to be less then 0.2 x VCC. In this case, VCC = 3V and 0.2 x VCC = 0.6V. In your schematic IN2H and IN1L are 0.9V. The inputs are between logic low and logic high. We recommend lowering the voltage from 0.9V to less than 0.6V.

Thanks,

Madison Eaker

Motor Drivers

0 Holly Gu over 3 years ago in reply to Madison Eaker

TI__Intellectual 2750 points

Hi Team,

Thanks for the help, the issue is solved. :)

Motor drivers

Motor drivers forum

DRV8850: No output