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.
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典型非隔离(降压-升压)应用电路图
图3.NCL30073隔离(反激)应用电路图
15W高功率因素LED驱动器评估板NCL30073LED2GEVB
This manual covers the specification, theory of operation,testing and construction of the NCL30073LED2GEVBevaluation board. The NCL30073 board demonstrates a15 W high PF flyback LED driver for a typical downlightapplication.
评估板NCL30073LED2GEVB主要特性:
• Low Parts Count
• TRIAC Dimmer compatible
• High Power Factor
• Integrated Fault Protection
♦ Over Temperature on board (a PCB mounted PTC)
♦ Output Over Current
♦ Output Over Voltage
评估板NCL30073LED2GEVB指标:
图4.评估板NCL30073LED2GEVB外形图
图5.评估板NCL30073LED2GEVB电路图:输入电路
图6.评估板NCL30073LED2GEVB电路图:主电路
评估板NCL30073LED2GEVB材料清单:
图7.评估板NCL30073LED2GEVB顶层PCB设计图
图8.评估板NCL30073LED2GEVB PCB尺寸图
