Datasheet Diodes AL58221

Manufacturer	Diodes
Series	AL58221

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Detailed Description

The AL58221 is a 12-channel (R/G/B x 4), constant-current, Adaptive Pulse Density Modulation (APDM) LED driver which operates over a 3V~5.5V input voltage range.

The device provides 12 open-drain constant-current sinking outputs that are rated to 24V and delivers up to 60mA of high-accuracy current to each string of LED. Each channel’s average output current can be individually programmable through a digital interface. The current at each output is set by three external current-setting resistors.

The AL58221 features a 10MHz double-edge trigger data clock input to reduce EMI. It offers a 2-wire serial interface to send grayscale data, control commands including 16/14/12/8-bit grayscale selection, grayscale clock frequency division selection, output polarity selection for high-power LED driving, output Trise and Tfall timing selection, current output waveform selection, and internal-latch function.

The device provides an adaptive pulse density modulation method to increase the visual refresh rate up to 1000 Hz @ 16-bit grayscale. It reduces flickers and provides output current bilateral processing for EMI reduction.

The AL58221 utilizes a clock duty recovery technique and pulse retiming to support longer distance connection and multiple devices’ cascading applications. It also provides typical ±1% channel-tochannel LED current accuracy. Additional features include a ±0.1% regulated output current capability and fast output transient response.

The AL58221 is available in the TSSOP-24EP (Type A1-B) package and is specified over the -40°C to +85°C ambient temperature range.

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Manufacturer's Classification

• Power Management > LED Drivers > Linear LED Drivers