The highly integrated FAN6754A PWM controller provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions.Under zero-load and very light-load conditions, FAN6754A saves PWM pulses by entering deep burst mode. This burst mode function enables the power supply to meet international power conservation requirements. FAN6754A integrates a frequency-hopping function internally to reduce EMI emission of a power supply with minimum line filters. Built-in synchronized slope compensation is accomplished by proprietary HV monitor to adjust V for constant output power limit over universal AC input range. The gate output is clamped at 13V to protect the external MOSFET from over-voltage damage. Other protection functions include AC input brownout protection with hysteresis, SENSE pin short-circuit protection, and V over-voltage protection. For overtemperature protection, an external NTC thermistor can be applied to sense the external switcher’s temperature. When V OVP or OTP are activated, an internal latch circuit is used to latch-off the controller. The latch mode is reset when the VFAN6754A is available in an 8-pin SOP package.
●Features
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● High-Voltage Startup
● AC Input Brownout Protection with Hysteresis• Monitor HV to Adjust VLimit
● Low Operating Current: 1.5mA
● Linearly Decreasing PWM Frequency to 22KHz
● Frequency Hopping to Reduce EMI Emission
● Fixed PWM Frequency: 65KHz
● Peak-Current-Mode Control
● Cycle-by-Cycle Current Limiting
● Leading-Edge Blanking (LEB)
● Internal Open-Loop Protection
● GATE Output Maximum Voltage Clamp: 13V
● VDD Under-Voltage Lockout (UVLO)
● VDD Over-Voltage Protection (OVP)
● Programmable Over-Temperature Protection (OTP)
● Open-Loop Protection (OLP); Restart for MR, Latch for ML
● Internal Latch Circuit (OVP, OTP)
● Built-in 8ms Soft-Start Function
● SENSE Short-Circuit Protection (SSCP)
