New Multi-Topology LED Driver Controller from Diodes

Diodes has launched a new LED driver integrated chip (IC) that increases the dependability of high-brightness lamps. The multi-topology ZXLD1370 LED driver IC can be used for lights that are used in industrial, commercial and automotive lighting systems. The new LED driver controller offers different operating modes namely, boost, buck-boost and buck.

The LED driver features a combination of high-side current sensing and patent-awaiting control loops so that the current of LED strings is controlled accurately. The operating input voltage of the driver ranges from 6 to 60 V. The driver has an output current tolerance of 1% in any topology. With these qualities, the LED driver can deliver tighter inter-lamp luminance-matching and high current levels that high-brightness LED systems need.

The durability and dependability of the LED driver is enhanced by active thermal management of the LED, which is achieved through an external thermistor input. The durability is also achieved by fault diagnosis outputs that provide the load and driver status. The LED driver has the capability to switch 1 MHz frequency with low frequency clamp of 100 kHz. Hence a small external inductor and simple input EMI filters can be used, if required.

The new LED driver IC supports various current specifications and LED configurations, as it is used along with an external MOSFET. High-accuracy dimming can be achieved from the ZXLD1370 with two options, namely, PWM dimming and DC dimming. As the driver features a dedicated PWM input, it provides a dimming range of 1000:1 at 1 kHz. This enables the LED driver controller to control color mixing with high accuracy and provide good resolution even in low brightness.