Hubert Posted on October 21, 2020
R6 positive feedback accelerates the turn-on and prevents input jitter from causing shutdown.
Kanye Posted on October 21, 2020
It is a bit similar to the "hysteresis" circuit, which prevents jitter near the undervoltage point. When the output voltage drops, the acceleration transistor is turned off, and when the output rises, the acceleration transistor is turned on.
Queen Posted on October 21, 2020
R6 is positive feedback, speeding up Q1 to turn on.
Eason Posted on October 21, 2020
It is the positive feedback that promotes the conduction of 431 and also accelerates the conduction of the transistor.
