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Original question:

TIDA-00951: Vbus read max value all the time while the dsp is connected to 00951

TIDA-00951: PWM duty cycle change issue

michael coletti
Intellectual 835 points

Part Number: TIDA-00951

Hi,

When we worked at buck mode ,we have noticed that change in the PWM does not change the actual PWM that trigger the gate, there for the d-s is triggerd at ~50%.

i found this thread, which ask Ram the same question but he did not answer it.

can you please clarify it ?

TIDA-00951: A problem about TIDA-00951 48V to 400V Isolated Bidirectional DC/DC Converter Reference Design...

e2e.ti.com
Part Number: TIDA-00951 The Vds of Q9/Q8/Q7/Q6 is twice VBUS.And the output voltage of VBAT keep constant when I change the duty of Q6~Q9 from 3% to 35%.

in the photo you can see that PWM trigger of 10% duty cycle correspond to ~50% d-s triggering

yellow and green = 10% duty cycle from the dsp

blue and orange = drain source of q6,q7

Thanks

Michael