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Original question:

BQ76952: BQ76952 TS1 query

BQ76952: DSG driver abnormal

Gabriel Wang1
Genius 4755 points
Part Number: BQ76952


Dear Expert

Yellow represents the charging driver of 76952, and green represents the discharge driver.
Why do green sawteeth appear when turned off and then turned on again? And it never gets higher .

Cp1 use 2uf .

  • 0
    TI__Mastermind 25980 points

    Hi Gabriel,

    It looks like the quick turn off PFET isn't implemented correctly. I'm not certain if this is the root cause, but it would be good to fix regardless.

    From TIDA-010208:

    The part circled in red is how the circuit that you're implementing with the PFET should be. Most notably, the Zener diode is backwards. Can you try redoing the circuit in the way that the reference design does and see if there is any improvement?

    Regards,

    Max Verboncoeur