On Semi NCL30073 9W高功率因素LED驱动方案
On Semi公司的NCL30073是高度集成的电流模式PWM控制器,电源电压高达24V,固定频率65kHz开关频率,具有自动恢复的保护功能:OVP,OIP,OTP和短路.功率因素大于0.9, EPS 2.0兼容,主要用在调光改进型和低功耗固定装置LED应用,相控调光兼容的LE或LED类型,支持多种拓扑如降压,降压升压和反激转换器.本文介绍了NCL30073主要特性,内部电路架构图,应用电路以及9W高功率因素LED驱动器评估板NCL32073LED1GEVB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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