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| NCL30088 18W高功率因素LED驱动方案 |
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| 文章来源： 更新时间：2014/12/24 13:00:00 |
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On Semi公司的NCL30088是AC/DC转换器电源PFC反激控制器, 作在准谐振模式以提供最佳效率,主要用在非隔离的降压-升压/SEPIC恒流LED驱动器. 由于采用新颖控制方案,器件可从初级边调整恒定LED电流,使得次级边不需要反馈电路,偏压和光耦合器,从而外接元件最少, 主要用在LED灯泡和管,LED驱动器/电源以及LED照明引擎, LED照明的电子控制装置.本文介绍了NCL30088主要特性,功能框图,典型应用电路,以及18W高功率因素LED驱动器评估板NCL30088LED1GEVB主要特性别,电路图,材料清单和PCB元件布局图.
The NCL30088 is an Ac-Dc power factor corrected flyback controller targeting isolated and non−isolated buck-boost/SEPIC constant current LED drivers. The controller operates in a quasi−resonant mode to provide optimal efficiency. Thanks to a novel control method, the device is able to tightly regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact, space efficient designs.
NCL30088主要特性:
• Quasi−resonant Peak Current−mode Control Operation
• Constant Current Control with Primary Side Feedback
• Tight LED Constant Current Regulation of ±2% Typical
• Power Factor Correction
• Line Feedforward for Enhanced Regulation Accuracy
• Low Start−up Current (13 A typ.)
• Wide Vcc Range
• 300 mA / 500 mA Totem Pole Driver with 12 V Gate Clamp
• Robust Protection Features
♦ OVP on VCC
♦ Programmable Over Voltage / LED Open Circuit Protection
♦ Cycle−by−cycle Peak Current Limit
♦ Winding Short Circuit Protection
♦ Secondary Diode Short Protection
♦ Output Short Circuit Protection
♦ Shorted Current Sense Protection
♦ User Programmable NTC Based Thermal Foldback
♦ Thermal Shutdown
♦ Vcc Undervoltage Lockout
♦ Brown−out Protection
• Pb−Free, Halide−Free Product
• Four Versions: NCL30088A, B, C and D
NCL30088典型应用:
• Integral LED Bulbs and Tubes
• LED Light Engines
• LED Drivers/Power Supplies
• Electronic Control Gear for LED Lighting
图1. NCL30088功能框图
图2. NCL30088反激转换器应用电路图
图3. NCL30088降压-升压转换器应用电路图
18W高功率因素LED驱动器评估板NCL30088LED1GEVB
This manual covers the specification, theory of operation,testing and construction of the NCL30088LED1GEVB demonstration board. The NCL30088 board demonstrates a 18 W high PF buck boost LED driver in a typical T8 outline.
评估板NCL30088LED1GEVB主要特性:
• Wide Mains
• Low THD across Line and Load
• High Power Factor across Wide Line and Load
• Integrated Auto Recovery Fault Protection (can be latched by Choice of Options)
♦ Over Temperature on Board (a PCB mounted NTC)
♦ Over Current
♦ Output and Vcc Over Voltage
评估板NCL30088LED1GEVB主要指标:
图4. 评估板NCL30088LED1GEVB外形图
图5. 评估板NCL30088LED1GEVB电路图:输入部分
图6. 评估板NCL30088LED1GEVB电路图:主电路
评估板NCL30088LED1GEVB材料清单:
图7. 评估板NCL30088LED1GEVB PCB元件布局图:顶层
图8. 评估板NCL30088LED1GEVB PCB元件布局图:底层 |
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