Fairchild Semiconductor FAN6753MY

Switching Controller, Current-mode, 68kHz Switching Freq-Max, BICMOS, PDSO8

TAPE REEL / Highly Integrated Green Mode PWM Controller

IC CTRLR PWM GREEN CM OVP 8SOP

The highly integrated FAN6753 PWM controller provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary adaptive green-mode function provides frequency modulation at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 22KHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, FAN6753 is manufactured using the BiCMOS process, which allows an operating current of only 2.7mA. FAN6753 integrates a full-range frequency-hopping function internally that helps reduce EMI emission of a power supply with minimum line filters. Its built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary internal line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC. FAN6753 provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output short-circuit failure occur. PWM output is disabled until VDD drops below the UVLO lower limit, when the controller starts up again. As long as VDD exceeds ~26V, the internal OVP circuit is triggered. FAN6753 is available in an 8-pin SOP package.