Press release

Adaptive LED Current Ripple Suppressor from Diodes Incorporated Enables High Power Factor and Flicker-Free Professional LED Lighting

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Diodes Incorporated (Nasdaq: DIOD) today announced the availability of
the AL5822 LED current ripple suppressor, which provides high levels of
ripple suppression while maintaining high power factor for commercial
and industrial lighting applications.

It is now mandatory to meet regulatory requirements to suppress low
frequency ripple (100Hz to 120Hz) in LED lighting applications in many
markets, enforced through standards such as the California Energy
Commission Title 24. 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.
This ensures there is no sign of flicker or strobing across the entire
dimming range, while still maintaining a high power factor.

The AL5822 has been designed and tested to comply with the Title 24
building code requirement of less than 30% flicker. The results show
that the AL5822 suppresses over 97% 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. This control loop keeps the MOSFET operating in the saturation
region to deliver a constant current.

With support for various pre-stage circuits, the AL5822 can work with a
number of drivers, such as the AL1665 single stage PFC flyback
buck/boost controller, also from Diodes Incorporated. The integrated
features of the AL5822 remove 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.

The AL5822 is available in the SOT26 package. Further information is
available at

About Diodes Incorporated

Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor’s SmallCap 600
and Russell 3000 Index company, is a leading global manufacturer and
supplier of high-quality application specific standard products within
the broad discrete, logic, analog and mixed-signal semiconductor
markets. Diodes serves the consumer electronics, computing,
communications, industrial, and automotive markets. Diodes’ products
include diodes, rectifiers, transistors, MOSFETs, protection devices,
function-specific arrays, single gate logic, amplifiers and comparators,
Hall-effect and temperature sensors, power management devices, including
LED drivers, AC-DC converters and controllers, DC-DC switching and
linear voltage regulators, and voltage references along with special
function devices, such as USB power switches, load switches, voltage
supervisors, and motor controllers. Diodes also has timing,
connectivity, switching, and signal integrity solutions for high-speed
signals. Diodes’ corporate headquarters and Americas’ sales office are
located in Plano, Texas and Milpitas, California. Design, marketing, and
engineering centers are located in Plano; Milpitas; Taipei, Taiwan;
Taoyuan City, Taiwan; Zhubei City, Taiwan; Manchester, England; and
Neuhaus, Germany. Diodes’ wafer fabrication facilities are located in
Manchester and Greenock, UK, and Shanghai, China. Diodes has assembly
and test facilities located in Shanghai, Jinan, Chengdu, and Yangzhou,
China, as well as in Hong Kong, Neuhaus and Taipei. Additional
engineering, sales, warehouse, and logistics offices are located in
Taipei; Hong Kong; Manchester; Shanghai; Shenzhen, China; Seongnam-si,
South Korea; and Munich, Germany, with support offices throughout the

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