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.

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典型应用:

• Dimmable Retrofit and Low Power Fixture LED Applications

• Phase Cut Dimmer Compatible – LE or TE Types

• Multiple Topology Support

♦ Buck

♦ Buck Boost

♦ Flyback

图1.NCL30073内部电路架构图

图2.NCL30073非隔离(降压-升压)应用电路图

图3.NCL30073隔离(反激)应用电路图

评估板NCL32073LED1GEVB:9W高功率因素LED驱动器

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.

评估板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

评估板NCL32073LED1GEVB主要指标:

图4.评估板NCL32073LED1GEVB外形图

图5.评估板NCL32073LED1GEVB电路图(1)

图6.评估板NCL32073LED1GEVB电路图(2)

评估板NCL32073LED1GEVB材料清单:

图7.评估板NCL32073LED1GEVB PCB设计图(T)

图8.评估板NCL32073LED1GEVB PCB设计图(B)