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The AL1663 is a high performance single stage Flyback and Buck-boost controller, targeting dimmable LED lighting application. It is a primary side regulation (PSR) controller which can provide accurate constant current (CC) regulation without optocoupler and secondary control circuitry. It is operating at BCM mode which results in good EMI and efficiency, and keeps high PF and low total harmonic distortion (THD) under universal input voltage.
The AL1663 can support multiple dimming modes. When a 0.3 to 2.4V DC signal is applied on APWM pin, the device will operate in analog dimming mode. When a digital signal is applied on APWM pin, the device works at PWM dimming mode. And for AL1663 When a digital signal is applied on PWMD pin and the APWM pin is connected with a hundreds of nF capacitor, the device will work in PWM-to-DC dimming mode.
The AL1663 features low start-up current and low operation current. It integrates multiple protections including over voltage, short circuit, over current and over temperature protection.