DRV8662 VBST question

Carter Liu

Other Parts Discussed in Thread: DRV8662

Hi,

The DRV8662 EVM board when disconnect JP2 and JP3，then power on,with Gain1:0，Gain0:0，EN:1,then measure the VBST with an oscilloscope,the voltage is strange,I want some help from you,thanks!

Best Regards

Carter

over 11 years ago

0 Brian Burk over 11 years ago

TI__Genius 9670 points

Carter,

I am not sure what your graph is showing. Is the V/div 5V?

The DRV8662 boost is based on the feedback resistors on the FB node. When GAIN1 = 1 and GAIN0 = 0 on the EVM, the boost should be set to ~55V.

Thanks,
Brian

0 Mandy Barsilai over 11 years ago in reply to Brian Burk

TI__Prodigy 120 points

Hi Carter,

could you also check if your oscilloscope is in DC coupled mode? if you set the scope to AC Coupled you will be unable to see the DC Offset (which is what you are looking for)

Thanks,

Mandy

Motor drivers

Motor drivers forum

DRV8662 VBST question