A member of the 8800 LED lighting controller family, the 88EM8801 dual-string dimmable LED lighting controller packs high-end lighting features into a single chip that would otherwise require multiple driver chips, a microcontroller, and many discrete components to implement. The chip features intelligent digital controls and a unique current-tuning capability that enables the use of loosely binned, lower-cost LEDs to deliver uniform light output and constant color temperature during the manufacturing process and throughout the long lifespan of the LED lamps themselves.
The device offers PWM dimming controller circuitry and other digital controls to achieve deep dimming levels up to 0.1% with 10-bit PWM control resolution. Specifications include 95% efficiency, up to 40-Vdc input, up to 15-W input power, and up to 800-kHz switching frequency. By offering independent control of two LED strings, the chip allows the mixing of red LEDs with cool white or bluish green LEDs to achieve warmer color and better CRI. It also features soft startup, undervoltage lockout, overcurrent and overtemperature protection, I2 C interface for OTP memory programming and communication (Zigbee, Wi-Fi, PLC). (Contact company for pricing and availability.)
By Christina Nickolas
Marvell Semiconductor , Santa Clara , CA
Information 408-222-2500
www.marvell.com
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