On Semi公司的NCL30073是高度集成的電流模式PWM控制器,電源電壓高達24V,固定頻率65kHz開關頻率,具有自動恢復的保護功能:OVP,OIP,OTP和短路.功率因素大于0.9, EPS 2.0兼容,主要用在調光改進型和低功耗固定裝置LED應用,相控調光兼容的LE或LED類型,支持多種拓撲如降壓,降壓升壓和反激轉換器.本文介紹了NCL30073主要特性,內部電路架構圖,應用電路以及9W高功率因素LED驅動器評估板NCL32073LED1GEVB主要特性和指標,電路圖,材料清單和PCB設計圖.

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.

Finally, a timer?based short?circuit protection offers the bestprotection scheme, letting you precisely select the protection trip pointwithout caring of a loose coupling between the auxiliary and the powerwindings.

NCL30073主要特性:

? Fixed?frequency 65 kHz Current?mode Control Operation
? Internal and Adjustable Over Power Protection (OPP) Circuit
? Internal Ramp Compensation
? Internally Fixed 4 ms Soft?start
? 115 ms Timer?based Auto?recovery Short?circuit Protection
? Protection ? Autorecovery
? OVP by VCC
? OIP
? OTP ? Foldback
? Short Circuit
? Up to 24 V VCC Operation
? Extremely Low No?load Standby Power
? Isolated and Non?isolated Outputs
? Good Regulation – 5%
? High Power Factor > 0.9
? Single Winding Inductor
? Low Parts Count
? EPS 2.0 Compliant
? Pb?Free Devices
? +300 mA/ ?500 mA Source/Sink Drive Capability

NCL30073典型應用:

? Dimmable Retrofit and Low Power Fixture LED Applications
? Phase Cut Dimmer Compatible – LE or TE Types
? Multiple Topology Support
? Buck
? Buck Boost
? Flyback

圖1.NCL30073內部電路架構圖

圖2.NCL30073非隔離(降壓-升壓)應用電路圖

圖3.NCL30073隔離(反激)應用電路圖

評估板NCL32073LED1GEVB:9W高功率因素LED驅動器

This manual covers the specification, theory of operation, testing and construction of the NCL32073LED1GEVB demonstration board. The NCL32073 board demonstrates a 9 W high PF buck boost LED driver for a typical retrofit application.

評估板NCL32073LED1GEVB主要特性:

? Low Parts Count
? TRIAC Dimmer compatible
? High Power Factor
? Integrated Fault Protection o Over Temperature on board (a PCB mounted PTC)
o Output Over Current
o Output Over Voltage
評估板NCL32073LED1GEVB主要指標:

圖4.評估板NCL32073LED1GEVB外形圖

圖5.評估板NCL32073LED1GEVB電路圖(1)

圖6.評估板NCL32073LED1GEVB電路圖(2)
評估板NCL32073LED1GEVB材料清單:

圖7.評估板NCL32073LED1GEVB PCB設計圖(T)

圖8.評估板NCL32073LED1GEVB PCB設計圖(B)