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| NCL30088 18W高功率因素LED驅(qū)動(dòng)方案 |
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| 文章來(lái)源： 更新時(shí)間：2014/12/24 13:00:00 |
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On Semi公司的NCL30088是AC/DC轉(zhuǎn)換器電源PFC反激控制器, 作在準(zhǔn)諧振模式以提供最佳效率,主要用在非隔離的降壓-升壓/SEPIC恒流LED驅(qū)動(dòng)器. 由于采用新穎控制方案,器件可從初級(jí)邊調(diào)整恒定LED電流,使得次級(jí)邊不需要反饋電路,偏壓和光耦合器,從而外接元件最少, 主要用在LED燈泡和管,LED驅(qū)動(dòng)器/電源以及LED照明引擎, LED照明的電子控制裝置.本文介紹了NCL30088主要特性,功能框圖,典型應(yīng)用電路,以及18W高功率因素LED驅(qū)動(dòng)器評(píng)估板NCL30088LED1GEVB主要特性別,電路圖,材料清單和PCB元件布局圖.
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典型應(yīng)用:
• Integral LED Bulbs and Tubes
• LED Light Engines
• LED Drivers/Power Supplies
• Electronic Control Gear for LED Lighting
圖1. NCL30088功能框圖
圖2. NCL30088反激轉(zhuǎn)換器應(yīng)用電路圖
圖3. NCL30088降壓-升壓轉(zhuǎn)換器應(yīng)用電路圖
18W高功率因素LED驅(qū)動(dòng)器評(píng)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.
評(píng)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
評(píng)估板NCL30088LED1GEVB主要指標(biāo):
圖4. 評(píng)估板NCL30088LED1GEVB外形圖
圖5. 評(píng)估板NCL30088LED1GEVB電路圖:輸入部分
圖6. 評(píng)估板NCL30088LED1GEVB電路圖:主電路
評(píng)估板NCL30088LED1GEVB材料清單:
圖7. 評(píng)估板NCL30088LED1GEVB PCB元件布局圖:頂層
圖8. 評(píng)估板NCL30088LED1GEVB PCB元件布局圖:底層 |
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