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Power Electronics Europe News
 
Diodes unveil AL5887 is dual digital interface, multi-channel LED driver
The latest linear current LED driver from Diodes drives multiple LEDs for complex colour mixing and different lighting patterns. The LL5887 integrates both I2C and serial peripheral interface (SPI) options. It delivers a wide colour range and an extensive dynamic range of brightness levels, says the company.

There are 36 independent programmable channels which can drive up to 12 RGB LED modules or 36 single colour emitters. It features an internal 12-bit pulse width modulation (PWM) for colour and six-bit analogue brightness control, which can be accessed through either interface.

There are three programmable banks for software control of each colour, making it easier to programme and set RGB lighting module patterns. An independent colour-mixing and brightness register per channel enables better colour-mixing schemes, explains the company. The dimming function relies on a PWM duty cycle from three to 100%. Once the duty cycle goes below 3%, internal circuitry converts the output to analogue dimming, maintaining linearity. By combining PWM and analogue dimming functions, a dimming ratio greater than 100K to 1 can be achieved.

There are also advanced diagnostics with fault-reporting functions. There are built-in protection capabilities for continued operation, including both short circuit and open-LED protection, as well as over-temperature shutdown. For earlier detection, there is also a pre-event over-temperature shutdown warning function.

Two external hardware address pins enable up to four devices to be connected in I2C mode. An internal 16MHz oscillator avoids the need for an external high-precision clock, reducing the overall bill of materials (BoM) cost.

The AL5887 LED driver is supplied in a 52-pin wettable QFN package, with exposed pad for heat dissipation.

Typical applications that are suitable for the LED driver are in smart home appliances, electric vehicle charging stations, infotainment displays, IoT information indicators, and computing hardware.

 

 



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