AL1663/AL1663R
UNIVERSAL FLYBACK AND BUCK-BOOST
SINGLE STAGE DIMMABLE LED CONTROLLER Description Pin Assignments The AL1663/AL1663R 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
and switching at the valley which results in good EMI and efficiency.
With working in constant on time, the system achieves high PF and
low total harmonic distortion (THD) under universal input voltage.
The AL1663/AL1663R can support multiple dimming modes. When a
0.3V 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/AL1663R features low start-up current and low operation
current. It integrates multiple protections including over voltage, short
circuit, over current and over temperature protection. (Top View)
8 APWM 2 7 COMP 6 VCC 5 OUT APWM 1 8 FB NC 1 PWMD 2 7 VCC FB COMP 3 6 OUT CS 3 CS 4 5 GND GND 4 AL1663
SO-8 AL1663R
SO-8 Applications
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