Ask about the stability of DCDC power supply loop

kal9623287

Ask about the stability of DCDC power supply loop [Copy link]

I would like to ask you, when testing the loop stability of the DCDC power supply, should the feedforward capacitor be connected in parallel across the upper voltage divider resistor R1, or across R1 + the injection resistor?

maychang

Your [injection resistor] was not originally in the circuit and was added during testing. Where should the [injection resistor] be added?

maychang

Why do we use transformer isolation and the method of inserting an injection resistor in series at the high end of the voltage divider circuit in the feedback loop? Can't we add the signal close to the ground (such as the lower end of R2)?