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TPSM86837: Feedback calculation

Mindaugas Staisiunas
Prodigy 20 points
Part Number: TPSM86837

Tool/software:

Why R6 is not included in the Vout calculation? 

  • +1
    TI__Mastermind 22156 points

    Hi 

    R6 value is only 49.9Ohm, which is small comparing to R7 and R8,  has very slight impact to the Vout (3mV seen from below). We do not include R6 in the equation normally.

    R6 R7 R8 VOUT calculation
    49.9 20000 10000 1.8 0.6*(1+R7/R8)
    49.9 20000 10000 1.802994 0.6*(1+(R7+R6)/R8)

    The 49.9 Ohm resistor is the injection resistor reserved incase the user need to measure the bode plot.   Measuring Loop gain in power supplies.

    Thanks and best regards.