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关键词: Powerint , LNK419EG , LED照明
Powerint公司的LinkSwitchTM-PH系列是LED驱动器系列,单级PFC,初级恒流控制,可选择TRIAC调光/不调光,不需要光耦和电流检测电路.器件集成了725V功率FET,连续模式PWM控制器,用于自偏压的高压开关电流源,频率抖动和保护电路,从大局出发大大简化了离线LED驱动器,主要用于离线LED驱动器.本文介绍了LinkSwitch-PH系列产品亮点,方框图,14W和7W LED驱动电路图,以及采用LNK419EG的40.5W街灯LED照明电路参考设计主要特性和指标,电路图,材料清单和PCB元件布局图.
2012-8-29 11:53:25 上传
The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring long lifetime, high efficiency, PF >0.9, and TRIAC dimming capability (LNK403-410). The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolytic bulk capacitor. The advanced primary-side control used by the LinkSwitch-PH device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits.
LinkSwitch-PH incorporates a 725 V power FET, a continuous-mode PWM controller, a high-voltage switched current source for self biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown.
LinkSwitch-PH系列产品亮点:
Dramatically Simplifies Off-line LED Drivers
• Single-stage combination of power factor correction and accurate constant-current (CC) output
• Enables very long lifetime designs (no electrolytic capacitors)
• Eliminates optocoupler and all secondary current control circuitry
• Eliminates control loop compensation circuitry
• Simple primary-side PWM dimming interface
• Universal input voltage range
• LNK403-410 optimized for flicker-free TRIAC dimming EcoSmart™ – Energy Efficient
• Single-stage PFC combined with output CC control
• Greatly increases efficiency, >90% achievable
• Reduces component count
• No current sense resistors
• Low standby power remote ON/OFF feature (<50 mW at 230 VAC)
Accurate and Consistent Performance
• Compensates for transformer inductance variations
• Compensates for line input voltage variation
• Frequency jittering greatly reduces EMI filter size and cost
Advanced Protection and Safety Features
• Auto-restart for short-circuit protection
• Open circuit fault detection mode
• Automatic thermal shutdown restart with hysteresis
• Meets high voltage creepage requirement between DRAIN and all other signal pins both on PCB and at package
Green Package
• Halogen free and ROHS compliant package
LinkSwitch-PH系列应用:
• Off-line LED driver
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下载附件 (96 KB) 图4.40.5W LED驱动器外形图
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下载附件 (21 KB) 图5.40.5W LED驱动器电路图
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2012-8-29 11:53:11 上传
下载附件 (32.5 KB) 图6.40.5W LED驱动器 PCB元件布局图(顶层)
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