High-integration driver cuts board space in LED lighting modules

July 25, 2016 // By Graham Prophet
Reducing the size of LED modules is facilitated by this single-wire input illumination LED driver from Toshiba; the 9-channel IC has integrated voltage regulation and daisy-chain pins to reduce board space in illumination designs.

The TB62D786FTG has a single-wire Manchester-encoded interface, which is frequently used for wireless communication. Built-in daisy-chain pins and a linear regulation circuit (LDO, 5V output) capable of handling inputs from 7V to 28V improve the extendibility of the IC.

In conventional designs, power has to be supplied to the LED driver ICs and LEDs separately. Using the TB62D786FTG, the number of wires between a host controller or MCU and the LED driver unit can be reduced to just four: a single power supply, single-wire input, single-wire daisy-chain output, and GND. Fewer connections, combined with the IC’s compact VQFN24A package, allows overall size of the LED unit board to be reduced and the IC to be used with smaller modules.

The device is compatible with an IC control voltage of 4.5V to 5.5V and can deliver up to output currents of up to 85 mA per channel. Input signal transfer frequency range is 0.5 MHz to 2 MHz, and illumination can be controlled using PWM gradation (0 to 127).

Toshiba Electronics Europe; www.toshiba.semicon-storage.com