FAN6300DZ Datasheet

Current Mode PWM Controllers


The highly integrated FAN6300DZ PWM controller provides several features to enhance the performance of flyback converters. A built-in HV startup circuit can provide more startup current to reduce the startup time of the controller. Once the VDD voltage exceeds the turn-on threshold voltage, the HV startup function is disabled immediately to improve power consumption. An internal valley voltage detector ensures the power system operates at Quasi-Resonant operation in widerange line voltage and any load conditions and reduces switching loss to minimize switching voltage on drain of power MOSFET. To minimize standby power consumption and light-load efficiency, a proprietary green-mode function provides off-time modulation to decrease switching frequency and perform extended valley voltage switching to keep to a minimum switching voltage. FAN6300DZ controller also provides many protection functions. Pulse-by-pulse current limiting ensures the fixed peak current limit level, even when a short circuit occurs. Once an open-circuit failure occurs in the feedback loop, the internal protection circuit disables PWM output immediately. As long as VDD drops below the turn-off threshold voltage, controller also disables PWM output. The gate output is clamped at 18V to protect the power MOS from high gate-source voltage conditions. The minimum tOFF time limit prevents the system frequency from being too high. If the DET pin reaches OVP, internal OTP is triggered, and the power system enters latch-mode until AC power is removed. FAN6300DZ Features • High-Voltage Startup • Quasi-Resonant Operation • Cycle-by-Cycle Current Limiting • Peak-Current-Mode Control • Leading-Edge Blanking • Internal Minimum tOFF• Internal 2ms Soft-Start • Over-Power Compensation • GATE Output Maximum Voltage • Auto-Recovery Short-Circuit Protection (FB Pin) • Auto-Recovery Open-Loop Protection (FB Pin) • VDD Pin & Output Voltage (DET Pin) OVP Latched FAN6300DZ Applications • AC/DC NB Adapters • Open-Frame SMPS


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