FSEZ2016 Datasheet | Fairchild Semiconductor

- Low-Power Green-Mode EZSWITCHTM without Secondary Side Feedback Circuitry April 2009 - Low-Power Green-Mode EZSWITCHTM without Secondary Side Feedback Circuitry Features - Linearly Decreasing PWM Frequency - Green Mode Under Light-load and Zero-Load Conditions Description This highly integrated PWM controller provides several Features to enhance the performance of low-power flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions. This green mode enables the power supply to meet international power conservation requirements. The supply voltage VDD is also used for feedback pensation, to regulate the output voltage without requiring a conventional TL431 and a photo-coupler. A typical output CV/CC characteristic is shown in Figure 1. Another advantage of the FSEZ2016 is that the typical startup current is only 8μA, while the typical operating current can be as low as 3.6m A. A large startup resistance can be used to achieve even higher power conversion efficiency. FSEZ2016 integrates frequency hopping function internally to reduce EMI emissions with minimum line filters. Also, built-in synchronized slope pensation maintains the stability of peak current-mode control. Proprietary internal pensation ensures constant output power limiting over a universal range of AC input voltages, from 90VAC to 264VAC. The FSEZ2016 provides many protection functions. Pulse-by-pulse current limiting ensures constant output current, even if a short circuit occurs. The internal protection circuit disables PWM output if VDD exceeds 22.7V. The gate output is clamped at 17V to protect the power MOS from over-voltage damage. The built-in over-temperature protection (OTP) function shuts down the controller at 140°C with a 30°C hysteresis. - Constant Voltage (CV) and Constant Current (CC) around ±25% without...