Diodes Inc’s Adaptive LED Current Ripple Suppressor Enables Flicker-Free Lighting

June 26, 2019 Alix Paultre

Diodes Incorporated released the AL5822 LED current ripple suppressor, which provides high levels of ripple suppression while maintaining high power factor for commercial and industrial lighting applications. Addressing regulatory requirements to suppress low-frequency ripple (100Hz to 120Hz) in LED lighting applications, the AL5822 delivers a high level of ripple current suppression in single-stage, high power LED installations, even when triac or PWM dimming techniques are being used to vary the light level.

The AL5822 also complies with the Title 24 building code requirement of less than 30 percent flicker, suppressing over 97 percent of ripple while still achieving a power factor of greater than 0.9. By monitoring the current flowing through the LEDs, the AL5822 compensates for ripple by adjusting the drive voltage for the external MOSFET, keeping it operating in the saturation region to deliver a constant current.

The AL5822 can work with a number of drivers, such as the AL1665 single stage PFC flyback buck/boost controller, and also removes the need for magnetic discrete components, minimizing the overall bill of materials. The AL5822 operates over an input voltage range of 24Vac to 305Vac. Safety features include LED short-circuit, over-temperature and over-current protection.

Learn more at www.diodes.com.

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