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UC2843A: Driving the comp pin directly

Danilo A.
Mastermind 24715 points
Part Number: UC2843A

Hi Team,

Our customer would like to confirm if it is possible to defeat the internal error amplifier by driving the comp pin directly. According to him, there is a legacy design that uses that technique and he was curious if it is a recommended method of bypassing the internal error amplifier. Additionally he would like to ask the following questions:

1. What is the tolerance of the 1V clamp on the non-inverting input of the current sense comparator?

2. What is the tolerance of the 2R/R divider network that is also attached to the non-inverting input of the current sense comparator?

Regards,

Danilo

  • 0
    TI__Mastermind 21075 points

    Hi Danilo,

    It is not recommended to drive the COMP pin directly. COMP is low impedance and very noise sensitive. As far as the tolerance of the internal 1V clamp and the R/2R divider, these are not measured parameters but a fair estimate can be had by considering the variation of the CS input which is the non-inverting pin to the CS comparator (the 1V clamp and resistive divider are the inverting input to the PWM comparator). This is given as 1V ±10% in the data sheet.

    Regards,

    Steve M