TLC5902

LED DRIVER

SLLS382 – DECEMBER 1999

1

POST OFFICE BOX 655303

Drive Capability and Output Counts

Current Output Range

(Maximum Error Between Bits)

– 0.4 V (Output Current 0 to 40 mA)

– 0.7 V (Output Current 40 to 80 mA)

Control 256 Steps

– Output Current Adjustment for 32 Steps

(Adjustment for Brightness Deviation

Between LEDs)

– 8 Steps Brightness Control by 8 Times

Speed Gray Scale Control Clock

(Brightness Adjustment for Panel)

– WDT Function

– TSD Function

(Schmitt-Triggered Input for All Input

Terminals)

Frequency

Temperature Range

description

The TLC5902 is a constant current driver that incorporates shift register, data latch, and constant current

circuitry with a current value adjustable and 256 gray-scale display that uses pulse width control. The output

current can be selected as maximum 80 mA with 16 bits or 120 mA with 8 bits. The current value of the constant

current output is set by one external resister. After this device is mounted on a printed-circuit board (PCB), the

brightness deviation between LEDs (ICs) can be adjusted using an external data input, and the brightness

control for the panel can be adjusted using the brightness adjustment circuitry. Moreover, the device

incorporates watchdog timer (WDT) circuitry, which turns the constant current output off when the scan signal

is stopped during dynamic scanning operation, and thermal shutdown (TSD) circuitry, which turns constant

current output off when the junction temperature exceeds the limit.

Copyright

© 1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.