On Semi NCL30073 15W LED驱动方案
On Semi公司的NCL30073是高度集成的PWM控制器,微型TSOP−6封装,工作电压高达24V,开关频率65kHz,峰值电流模式控制,集成了内部可调过功率保护(OPP)电路,内部斜率补偿和固定4ms软起动,基于115ms定时器的自动恢复短路保护,主要用在可调光和敌功率LED,支持多种托扑如降压,降压-升压和反激电源.本文介绍了NCL30073主要特性,内部电路架构图和应用电路,以及15W高功率因素LED驱动器评估板NCL30073LED2GEVB主要特性和指标,电路图,材料清单和PCB设计图.
The NCL30073 is a highly integrated PWM controller capable ofdelivering a rugged and high performance LED converter in a tinyTSOP−6 package. With a supply range up to 24 V, the controller hostsa 65 kHz switching circuitry operated in peak current mode control.When the voltage on FB pin decreases, the controller enters skip cyclewhile limiting the peak current.
Over Power Protection (OPP) is a difficult exercise especially whenno−load standby requirements drive the converter specifications. TheON proprietary integrated OPP lets you harness the maximumdelivered power without affecting your standby performance simplyvia two external resistors. An Over Voltage Protection is alsocombined on the same pin but also on the VCC line. They offer anefficient protection in case of adverse open loop operation.
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