Cold test fail

ahnjoseph — Thu, 08 Nov 2018 10:35:31 GMT

1. Application : Automotive HVAC 260W BLDC controller(12zvm)

2. Issue : Cold test fail

3. Condition : -40 degree & Input volt swing (8V<-->40V)

When I did test my BLDC controller in chamber be setup -40 degree and input Volt swing 8<---16V

DC Input change 8V to 16 V then that happen Desaturation Err but 16V to 8V is no problem

Err condition temperature is changed by Bootstrap cap value (Please Ref, parts" C23" on circuit)

Desaturation Err is dependent (Please Ref below data)

1. 220uF: -7`C

I had tried volt change with slop then it case is no problem

Can you advise to me ?

I had update my circuit & Oscilloscope capture data (Yellow : High side PWM / Blue : Current of DC power line)

Re: Cold test fail

danielmartynek — Wed, 14 Nov 2018 11:34:42 GMT

Hi,

Have you tried adjusting GDU blanking time (GBKTIM2) and the desaturation levels (GDYDSLVL)?

Regards,

Daniel