FSEZ2016

This highly integrated PWM controller of FSEZ2016 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 FSEZ2016 enables the power supply to meet international power conservation requirements. The supply voltage V_DD is also used for feedback compensation, to regulate the output voltage without requiring a conventional TL431 and a photo-coupler. FSEZ2016 output CV/CC characteristic is shown in Figure 1.

Another advantage of the FSEZ2016 is that the typical startup current is only 8?A, while the typical operating current can be as low as 3.6mA. 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 compensation maintains the stability of peak current-mode control. Proprietary internal compensation ensures constant output power limiting over a universal range of AC input voltages, from 90V_AC to 264V_AC.

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 V_DD 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.