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| NCL30085 10W高功率因素隔离LED驱动方案 |
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| 文章来源： 更新时间：2015/1/8 10:11:00 |
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On Semi公司的NCL30085是AC/DC转换器电源PFC反激控制器,工作在准谐振模式以提供最佳效率.由于采用新颖控制方案,器件可从初级边调整恒定LED电流,使得外接元件最少,70/25/5%三级调光,主要用在LED灯泡和管,LED驱动器/电源以及LED照明引擎.本文介绍了NCL30085主要特性,功能框图, 典型应用电路图以及10 W高功率因素隔离LED驱动器评估板NCL30085/88FLYGEVB主要特性,电路图,材料清单和PCB元件布局图.
The NCL30085 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 controller has integrated 3 step log dimming which allows an LED bulb or luminaire to be dimming from a standard wall switch. In addition to steps of 70% and 25% which are similar to a traditional 3 way lamp, one additional step of 5% current is included to support deep dimming applications.
NCL30085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
• 3 Step Dimming (70/25/5%)
• Line Feedforward for Enhanced Regulation Accuracy
• Low Start−up Current (10 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
♦ Current Sense Short Protection
♦ User Programmable NTC Based Thermal Foldback
♦ Thermal Shutdown
♦ Vcc Undervoltage Lockout
♦ Brown−out Protection
• Pb−Free, Halide−Free MSL1 Product
NCL30085典型应用:
• Integral LED Bulbs and Tubes
• LED Light Engines
• LED Drivers/Power Supplies
图1. NCL30085功能框图
图2. NCL30085典型应用电路图
10 W高功率因素隔离LED驱动器评估板NCL30085/88FLYGEVB
This manual covers the specification, theory of operation, testing and construction of the NCL30085/88FLYGEVB evaluation board. The NCL30085/88 board demonstrates a 10 W high PF isolated flyback LED driver in a typical A19 outline. The 2 evaluation boards are nearly identical in construction except for the controller and Vcc bulk capacitor. The NCL30088 controller is a non−dimming version while the NCL30085 supports 3 levels of step Dimming.
评估板NCL30085/88FLYGEVB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 A Version)
♦ Programmable Over Temperature Thermal Foldback (NTC mounted on PCB)
♦ Cycle by Cycle Current Limiting
♦ Open LED and Shorted Output Protection
图3. 评估板NCL30085/88FLYGEVB外形图
图4. 评估板NCL30085/88FLYGEVB电路图:输入电路
图5. 评估板NCL30085/88FLYGEVB电路图:主电路
评估板NCL30085/88FLYGEVB材料清单:
图6. 评估板NCL30085/88FLYGEVB PCB元件布局图:顶层
图7. 评估板NCL30085/88FLYGEVB PCB元件布局图:底层
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