The FAN6749 is a highly integrated ultra green-mode PWM controller. It features high voltage startup, low operating current, linearly reducing PWM frequency to 24kHz, proprietary frequency hopping to reduce EMI, two-level over-current protection (OCP), 1400ms delay for normal peak load, two-level OCP, 56ms delay for super peak load, output short-circuit protection (SCP), peak-current mode operation with cycle-by-cycle current limiting, HV pin brown-in/out protection with hysteresis, constant power limit by HV sampling, internal FB open-loop protection (OLP), GATE output maximum voltage clamp: 14.5V, VDD over-voltage protection (OVP), programmable over-temperature protection (OTP), integrated 6ms soft-start function, internal latch circuit (OVP, OTP, OCP, OLP, SCP), internal OTP sensor with hysteresis. It is suitable for general-purpose switched-mode power supplies and flyback power converters, including: power adapters, open-frame SMPS; specifically for SMPS with surge-current output, such as for printer, scanner, motor drivers.
The FAN6749 is a highly integrated PWM controller designed to enhance the performance of flyback converters, specifically targeting applications like open-frame SMPS with surge-current outputs. Key features include proprietary Green-Mode functionality that reduces standby power consumption by continuously decreasing switching frequency under light loads and entering Burst Mode at zero load.
| Operating Temperature Range | -40 to +105°C |
|---|---|
| Package Type | 8-Pin Small Outline Package (SOP) |
| Gate Output Maximum Voltage Clamp | 14.5V |
It is designed for power adapters, motor drivers, and open-frame SMPS with surge-current output such as printers and scanners.
The typical supply current during PWM operation is 1.8 mA, with a maximum of 2.4 mA.
Yes, it includes programmable Over-Temperature Protection (OTP) using an external NTC thermistor connected to the RT pin.