This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5085: FET selection affect ripple injection value?

Part Number: LM5085

Hello team,

Does Q1 selection affect the value of ripple voltage on Type-3 Ripple Circuit?

Best regards,


  • Hi Shotaro,

    Q1 selection affects your maximum ON time selection for FSW and RT, which affects your equation for choosing ripple voltage components. See section below where R3 and C1 are dependent on ON time: