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LM5122 adjustable Vout

Timothy Brandt
Prodigy 10 points
Other Parts Discussed in Thread: LM5122

Hello, I am wondering if anyone has done an adjustable Vout using PWM control with the LM5122. I have an 18V input with 2.5 A capable to supply. I would like to swing from 14V to 40 V using PWM. Any ideas would be appreciated.

  • 0
    TI__Guru 59141 points
    Hi
    If your PWM signal is strong enough, connect the PWM signal to FB pin through RC filter.
    If your PWM signal is weak, use a buffer and then connect the buffer output to FB through RC filter
    It will be PWM -> Buffer -> filter R-> filter C - resistor for Vout adjustment -> FB pin.
    Regards,