Linear LT3746 32路20mA LED驅(qū)動解決方案
Linear 公司的LT3746 是32路20mA LED驅(qū)動器,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LT3746主要特性,方框圖以及多種應(yīng)變用電路。
LT3746:32-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):32路LED驅(qū)動器,每路10-30mA,100Hz 12位調(diào)光
圖4。LT3746典型應(yīng)用電路(3):32路LED驅(qū)動器,每路10-30mA,500Hz 12位調(diào)光
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