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TPS40210 between error amplifier and PWM logic

Ruichen Zhao
Prodigy 40 points
Other Parts Discussed in Thread: TPS40210

Hello,

I am using TPS40210 to control a flyback converter but it seems the closed-loop system is pretty close to instability. When performing a spice simulation, I found the connection between the output of the error amplifier and PWM logic is not given for TPS40210.

In a traditional chip such as 384X, there are two diodes in series, a 3 to 1 step down voltage divider, and a zener diode between its error amplifier and comparator.

So the question is, is there any "processing stage" of the current reference generated by the amplifier? If so, could you please provide the information?

Thank you.

  • 0
    TI__Mastermind 35115 points

    There is a MOSFET source follower level shifter at the COMP pin. This is given by the typical the VVLY voltage spec of 1.2 V.

    *EDIT*

    Correction, the source follower is on the RC voltage to create the VVLY voltage. The COMP voltage is compared directly to the RC ramp + VVLY.