As title described, what's the resistance marked in below picture? information is for external loop compensation. thank you!
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As you can see from the block diagram FB feeds into the voltage-controlled error amplifier and the output of the error amp is the COMP pin voltage. the Resistors in question are only used as a resistor divider to scale the COMP pin voltage for the following current-controller error amp which regulates the PWM pulses.
Since the COMP pin is generated internal to the silicon, I do not see why any external comp network would impact it. Hence knowing those resistor values is not of any value for design purposes.
The external compensation will be connected between FB and COMP pin of the controller. I hope this answers your question.