Datasheet > SCT2508

SCT2508

更新时间： 2024-09-29 11:46:23

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SCT2508 数据手册

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Technology

SCT2508 V01_01; Jun/10

8-Output, 8-bit PWM LED Driver with Global Brightness Control

Product Description

The SCT2508 is a patented SPI+^TMinterface design for simplicity of backlight local dimming control. It’s

an 8ꢀbit constant current sink driver incorporating shift registers and data latches for SPI interface. The

patented design is employee to instantly realꢀtime updated dot luminance data without waiting

subsequent data are fully filled in display frame. The maximum current value of all 8 outputs is

determined by an external resistor and is adjustable with the OEI signal. Besides, the output current

value can be individually controlled with 256 steps. In application of LCD backlight, the SCT2508s can

be daisy chained to drive LED blocks with local dimming function in sequence of scanning images. A

synchronous signal (SYNC) initiated from controller is used to identify a frame start. The SCT2508

receiving the SYNC signal from the SYI pin has the right to download the PWM data bytes. Once the 8

PWM data are placed into the 8 data latches, the output currents are changed and the SYNC signal is

passed to the next SCT2508 via the SYO pin. Thus the brightness of each LED block is adjusted in

proper status and LEDs are lit according to the luminance of each block’s image.

Features

Patented SPI+^TMinterface for simplicity of local dimming control

Realꢀtime dot correction of luminance

Backlight local dimming controller available

Daisy chained SPI interface by SYI and SYO

5 MHz built in PWM clock, 8 individual 8ꢀbit PWM controlled outputs

8 robust constant current sinker with LED powerꢀsupply voltage up to 24V

Excellent regulation to load, supply voltage and temperature

Temperature regulation: ±0.005%/°C,

Load regulation: ±0.1%/V

Line regulation: ±0.5%/V

High current matching accuracy: ±1% between outputs, ±2% between ICs

Fine grayscale response with 120ns PWM pulse width

Buffered outputs to regenerate input signals for cascaded operation

Output current is set by a single external resistor and OEI programmable outputs

Constant output current : 3 – 30/45mA@3.3/5V

Low dropout voltage 0.5V@20mA, V_DD=5V

CMOS Schmitt trigger inputs

Builtꢀin power on reset(POR) circuit forces all the outputs ON while power on

Builtꢀin thermal protection function to prevent damage from over current operation

Package: TSSOP20

Applications: Local dimming LED backlight

12 3 4 5 6 7...16

中文翻译

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