8-channel, 2.5A LED dot controller with high-precision dimming control via SPI interface

The TPS92402 LED

dot-controller device enables 8-channel individual lighting

solutions by providing up to 2.5A pixel-level LED dimming control

with 4.5V to 65V wide input range. The device includes a string of 8 series-connected integrated shunt FETs, each of which

providing PWM dimming for an individual LED. The shunt FET string allows the device

to support constant current regulators with either commmon-anode or common-cathode

LEDs.

The TPS92402 has an

internal oscillator for a system clock to enable integrated PWM generator up to

16-bit with programmable PWM frequency up to 60kHz. The serial peripheral interface

(SPI) enables high speed data transmission and supports both daisy chain and star

connections. The SPI and optimized pinout allow multiple devices connected in

stacking configuration for single-layer PCBs.

The TPS92402

incorporates registers for programming PWM pulse width, slew rate, edge shift and

open voltage of each individual LED in the string and for reporting LED open, LED

short, shunt FET open and thermal warning. The internal charge pump incorporates

spread spectrum feature to enhance EMI performance. The TPS92402 also provides PWM dimming control of constant current regulators

and enables multi-channel power save to significantly increase dimming efficiency

especially in low brightness condition.