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LinearLT374632路20mALED驱动解决方案

发布时间:2020-06-30 18:34:15 阅读: 来源:风口厂家

Linear 公司的LT3746 是32路20mA LED驱动器,集成了55V降压控制器,每路可驱动30mA/13V串联led,6位点修正电流调整和12位灰度级PWM调光。器件工作电压6V-55V,主要用在大型显示屏LED背光,单色,多色和全色LED显示以及LED标牌。本文介绍了LT3746主要特性,方框图以及多种应变用电路。LT3746:32-ChannEL 20mA LED Driver with Buck ControllerThe 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 e LT3746 performs full diagnostic and protection against open/short LED and overtemperature fault. The fault status is sent back through the serial data e 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 3746主要特性:6V to 55V Power Input Voltage Range32 Independent LED Outputs up to 30mA/13V6-Bit Dot Correction Current Adjustment12-Bit Grayscale PWM Dimming0.5μs Minimum LED On TimeAdaptive LED Bus Voltage for High EfficiencyCascadable 30MHz Serial Data InterfaceFull Diagnostic and Protection: Individual Open/Short LED and Overtemperature FaultLT3746应用:Large Screen Display LED BacklightingMono-, Multi-, Full-Color LED DisplaysLED Billboards and Signboards

图1。LT3746方框图图2。LT3746典型应用电路(1)图3。LT3746典型应用电路(2):32路LED驱动器,每路10-30mA,100Hz 12位调光图4。LT3746典型应用电路(3):32路LED驱动器,每路10-30mA,500Hz 12位调光

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