QR-Mode PWM Controller with High Voltage Startup Circuit

Features

l   High-Voltage (700V) Startup Circuit

l   Low Start-Up Current

l   Multi-Mode Operation(QR/DCM/Burst) QR Operation @ Full/Medium Load

DCM Operation @ Light Load

Burst Mode Operation @ No Load

l   Switching Frequency is up to 160KHz

l   8ms Soft-start

l   Over Current Protection (OCP)

l   Over Load Protection (OLP)

l   Short Circuit Protection (SCP)

l   Adjustment OVP on ZCD Pin

l   Over Voltage Protection on VCC Pin

l   Brown in/out Detection

l   Output Diode Short Circuit Protection

l   On Chip OTP Protection

Description

GR1275Q  is  a  high  performance  multi-mode (QR/DCM/Burst  mode)  PWM  controller  with high-voltage    start-up    circuits    for    flyback converter. It could turn standby mode to green mode for high switching efficiency. It provides functions of low startup  current, over  current

protection, over voltage protection, short circuit protection, output diode short circuit protection, and internal OTP to prevent the circuit being damaged.

Application

l   Switching AC/DC power supply

l   QC+PD Charger

Typical Application Information