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Diodes has introduced support flyback and buck / boost topology AL1663 and AL1663R single-stage dimmable LED controller, without optocoupler and secondary control circuitry through the primary side regulation precise constant current output. These controllers operating power up to 150W, and with a variety of dimming options for LED backlighting, smart lighting and general LED dimmable LED lamps provide a cost-effective universal drive products.
Having a valley switching (valley-switching) control of critical conduction mode (BCM) operation brings high efficiency and low EMI, and further ensure AL1663 AL1663R able to maintain a high power factor and low total harmonic distortion at universal input voltage conditions. The use of primary side regulation to simplify design and reduce overall BOM component count and cost. AL1663 and AL1663R also has a low startup current and low operating current characteristics, and integrates several protection features including over-voltage, short circuit, overcurrent and overtemperature protection.
Both devices support both analog and digital dimming mode: AL1663R with a single dimming pin, accepts 0.3V to 2.4V DC analog signal, or when connected to a suitable input capacitance of several hundred nF accepts digital PWM input; AL1663 with additional digital dimming input pins can accept high frequency PWM signal and provides built-in PWM to DC converter.
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Diodes introduced support flyback and buck / boost topology controller
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