FAN6602R: 6Pin Green-Mode PWM Controller for Flyback Converter, 65KHz

A highly integrated PWM controller, FAN6602R provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary Green Mode provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters Burst Mode, which completely shuts off PWM output. Output restarts just before the supply voltage drops below the Under-Voltage Lockout (UVLO) lower limit. Green Mode enables power supplies to meet international power conservation requirements.The FAN6602R is designed for SMPS and integrates a frequency-hopping function that helps to reduce EMI emission of a power supply with minimum line filters. To compensate the power limit variation over universal input range, a current limit (VLIMIT) adaptively keeps the power limit substantially constant. The gate output is clamped at 13.5 V to protect the external MOSFET from over-voltage damage.Other protection functions include VDD Over-Voltage Protection (OVP), and Over-Temperature Protection (OTP). For OTP, an external NTC thermistor can be applied to sense the ambient temperature.

Features

• Low Startup Current: 8 µA
• Low Standby Power: Under 0.1 W
• Low Operating Current in Green Mode: 600 µA
• PWM Frequency Continuously Decreasing with Cycle Skipping and Burst Mode at Light Loads
• Fixed PWM Frequency (65 kHz) with Frequency Hopping
• Full Range Frequency Hopping
• Peak-Current Mode Operation with Cycle-by-Cycle Current Limiting
• Constant Output Power Limit (Full AC Input Range)
• VDD Over-Voltage Protection (OVP)
• Feedback Open-Loop Protection: 60 ms Delay
• Internal OTP Sensor with Hysteresis
• Gate Output Maximum Voltage Clamp: 13.5 V
• Gate Driving Capability: 400 mA
• Soft-Start Time: 6 ms
• Soft Driving for EMI Improvement