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UCC25640EVM-020: how to change standby Vout

Part Number: UCC25640EVM-020

Hello,
customer don't want to reduce Vout in standby mode and want to stay with 12V. What to change? Also is there formular to adjust standy Vout?

Regards, Holger

  • Hi, Holger

    shorting Pin2 and Pin3 of Q6 in below circuit can keep output voltage at 12V. 

    The reference voltage VREF of U2 is 1.25V, the output voltage Vo=VREF*(R19+R23//R56)/(R23//R56).

    R23//R56 means the resistance of R23 in parallel with R56.

    Yunsheng