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Linear LT3746 32路20mA LED驅(qū)動解決方案

作者: 時間:2011-04-17 來源:網(wǎng)絡(luò) 收藏

Linear 公司的20mA 器,集成了55V降壓控制器,每路可驅(qū)動30mA/13V串聯(lián)led,6位點修正電流調(diào)整和12位灰度級PWM調(diào)光。器件工作電壓6V-55V,主要用在大型顯示屏LED背光,單色,多色和全色LED顯示以及LED標(biāo)牌。本文介紹了主要特性,方框圖以及多種應(yīng)變用電路。

:32-ChannEL 20mA LED Driver with Buck Controller

The LT3746 integrates a 32-channel LED driver with a 55V buck controller. The LED driver lights up to 30mA/13V of LEDs in series per channel, and the buck controller generates an adaptive bus voltage supplying the parallel LED strings. Each channel has individual 6-bit dot correction current adjustment and 12-bit grayscale PWM dimming. Both dot correction and grayscale are accessible via a serial data interface in TTL/CMOS logic.

The LT3746 performs full diagnostic and protection against open/short LED and overtemperature fault. The fault status is sent back through the serial data interface.
The 30MHz fully-buffered, skew-balanced, cascadable serial data interface makes the chip extremely suitable for large screen LCD dynamic backlighting and mono-,multi-, full-color LED displays.

LT3746主要特性:

6V to 55V Power Input Voltage Range

32 Independent LED Outputs up to 30mA/13V

6-Bit Dot Correction Current Adjustment

12-Bit Grayscale PWM Dimming

0.5μs Minimum LED On Time

Adaptive LED Bus Voltage for High Efficiency

Cascadable 30MHz Serial Data Interface

Full Diagnostic and Protection: Individual Open/Short LED and Overtemperature Fault

LT3746應(yīng)用:

Large Screen Display LED Backlighting

Mono-, Multi-, Full-Color LED Displays

LED Billboards and Signboards


圖1。LT3746方框圖

圖2。LT3746典型應(yīng)用電路(1)

圖3。LT3746典型應(yīng)用電路(2):器,每路10-30mA,100Hz 12位調(diào)光

圖4。LT3746典型應(yīng)用電路(3):器,每路10-30mA,500Hz 12位調(diào)光



關(guān)鍵詞: LED驅(qū)動 LT3746 32路

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