16-channel CMOS LED driver
Toshiba Electronics Europe has introduced a 16-output constant-current LED driver, which allows closely matched drive currents within ±1% for up to 16 LEDs using only one programming resistor. The TCA62746 is built using pure CMOS technology, delivering a low-cost solution to driving multi-LED arrays for large-size display panels. Convenient features to control large LED arrays are managed via the device’s three-wire serial interface, which enables direct communication with a host controller. Features include output open-circuit and output short-circuit detection, which communicate status to the controller via the serial interface. The serial interface also supports cascading of multiple drivers to control larger LED arrays. In multi-driver implementations, typical output current matching between devices is ±3%.
With per-channel current output selectable from 2mA to 50mA, and constant-current output voltage up to 17V the TCA62746 is suitable for use with a wide variety of high-brightness LEDs. The operating voltage range, from 4.5V to 5.5V, allows direct integration with standard logic circuitry. Two 24-pin SSOP surface-mount package styles are available, offering a choice of 0.65mm lead pitch or 1.00mm pitch. Additional features enabling versatile LED control include greyscale dimming using an external PWM signal, an integrated Power On Reset as well as on-chip diagnostics. Furthermore an output delay circuit is also integrated, which minimises switching noise when multiple outputs are simultaneously turned on or off. The TCA62746 is functionally compatible with the existing Toshiba TB62706B and TB62726A BiCMOS 16-channel drivers.