Diodes ZXLD1371 LED driver controller

By extending input voltage operation from 60 to 5.0, the ZXLD1371 LED driver controller from Diodes has been designed to handle as broad a range of applications as possible, including those subject to the greatest variance in input voltage, such as automotive lighting and 12 VAC powered systems.

Its ability to control an external driver FET in buck, boost and buck-boost driver topologies makes it an all-in-one solution, capable of driving up to 20 high current LEDs in boost mode with accuracy.

Employing control loops and single resistor high-side current sensing, the device will deliver a typical output current tolerance of 1%, helping to produce improvements in brightness control and lamp luminance matching.

The controller offers users dimming over a wide dynamic range, through separate 20:1 DC dimming and 1000:1 PWM dimming options, giving higher accuracy light control particularly at lower brightness levels.

To further improve the reliability of LED lamp systems, the device provides thermal management of LEDs via a dedicated external thermistor input, which combined with fault diagnostic outputs reporting LED load and driver status, helps to increase LED longevity.

Switching at up to 1 MHz, the controller helps minimise circuit size by reducing the value of the external inductor.