The FAN6862 is designed for SMPS and integrates a frequency-hopping funcTIon that helps reduce EMI emission of a power supply with minimum line filters.
The built-in synchronized slope compensaTIon is proprietary sawtooth compensaTIon for constant output power limit over universal AC input range. The gate output is clamped at 18V to protect the external MOSFET from over-voltage damage.
Other protecTIon functions include VDD over-voltage protection and over-temperature protection. For overtemperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When VDD OVP or OTP is activated, an internal latch circuit latches off the controller.
FAN6862主要特性：
Low Startup Current: 8μA
Low Operating Current in Green Mode: 3mA
Peak-Current Mode Operation with Cycle-by-Cycle Current Limiting
PWM Frequency Continuously Decreasing with Burst Mode at Light Loads
VDD Over-Voltage Protection (OVP)
Constant Output Power Limit (Full AC Input Range)
Internal Latch Circuit for OVP, OTP
Fixed PWM Frequency (65KHz) with Frequency Hopping
Feedback Open-Loop Protection with 56ms Delay
Soft Start Time: 4ms
400mA Driving Capability
FAN6862应用：
General-purpose switch-mode power supplies and flyback power converters, including:
Power Adapters
Open-Frame SMPS
SMPS with Surge-Current Output, such as for Printers, Scanners, and Motor Drivers
图1。FAN6862方框图
图2。FAN6862典型应用电路图
图3。FAN6862起动电路图
图4。FAN6862 36W（12V/3A）应用电路图
36W（12V/3A）应用电路材料清单（BOM）：
采用FAN6862的40W参考设计RD-337
40W参考设计主要特性：
Low Startup Current: 8μA;
Low Operation Current in Green Mode: 3mA
Green Mode: Frequency Reduction with Burst Mode at Light Load
Fixed PWM Frequency at 65kHz with Frequency Hopping to Reduce EMI
Constant Output Power Limit
Soft-Start Time: 4ms
Driving Capability: 400mA
Various Protection Functions: VDD Over-Voltage Protections (OVP), Open-Loop Protection (OLP), and Over-Temperature Protection (OTP)
图5。40W参考设计电路图
图6。40W参考设计变压器连接图
变压器电特性：
