COMP VFF 2 3 1 INV - LINE VOLTAGE FEEDFORWARD + 40K 2.5V 4 CS 2V VOLTAGE REGULATOR - + - 8 VCC 5pF + Hiccup-mode OCP INTERNAL SUPPLY R Q S Q VCC 20V R1 + R2 7 GD UVLO DRIVER - VREF2 Blanking START ZERO CURRENT DETECTOR Starter STOP + BLANKING 2.1V 1.6V STARTER - Hiccup-mode OCP 5 ZCD DISABLE 6 GND