NS LM3424 恒流控制和热管理LED驱动方案
NS 公司的LM3424是带热管理的恒流N沟MOSFET控制器的LED驱动方案,有多个高压N-MOSFET控制器,可以配置成降压,升压,降-升压和SEPIC拓扑,输入电压高达75V,2Ω, 1A 峰值MOSFET栅极驱动器,主要应用在LED驱动器,室内和室外的SSL,汽车电子,通用照明和恒流稳压器.本文介绍了LM3424主要特性,方框图,典型应用电路以及降压,升压,降-升压和SEPIC应用电路与相应的材料清单.
LM3424: Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
The LM3424 is a versatile high voltage N-channel MosFET controller for LED drivers . It can be easily configured in buck, boost, buck-boost and SEPIC topologies. In addition, the LM3424 includes a thermal foldback feature for temperature management of the LEDs. This flexibility, along with an input voltage rating of 75V, makes the LM3424 ideal for illuminating LEDs in a very diverse, large family of applications. Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible.
The LM3424 uses standard peak current-mode control providing inherent input voltage feed-forward compensation for better noise immunity. It is designed to provide accurate thermal foldback with a programmable foldback breakpoint and slope. In addition, a 2.45V reference is provided.
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