|
Powerin的參考設(shè)計DER263是采用LinkSwitchTM-PH系列LNK406EG的14W PWM-模擬調(diào)光LED驅(qū)動器,LED串的電壓電流為28V/500A,輸入電壓范圍從90VAC到265VAC,高效率,230VAC時的PFC大于87%,115VAC時的PFC大于86%,功率因素大于0.9,滿足EN61000-3-2 Class C,1000:1調(diào)光范圍.本文介紹了14W PWM-模擬調(diào)光LED驅(qū)動器主要特性和指標,電路圖,材料清單與PCB布局圖. The document describes a high power-factor secondary referenced, analog dimmable LED driver. The circuit is designed to drive a nominal LED string voltage of 28 V at 500 mA from an input voltage range of 90 VAC to 265 VAC. The LED driver utilizes the LNK406EG from the LinkSwitch-PH family of ICs. Analog dimming is controlled by an external secondary referenced analog control signal of 0-10 V. 0 volts correspond to minimum light output and 10 V corresponds to maximum brightness. The analog controlled signal is transferred to the primary-side and controls the feedback current IFB of LNK406EG which in turn controls the output power/light output of the driver while maintaining high power factor and low THD. An active load circuit and control are also included to extend dimming ratio beyond 1000:1 but may be omitted if extended dimming operation is not required. This document contains the LED driver specification, schematic, PCB diagram, bill of materials, conducted EMI measurements, thermal measurements, transformer documentation and typical performance characteristics. 14W PWM-模擬調(diào)光LED驅(qū)動器主要特性: High efficiency, power factor corrected o >87% at 230 VAC and >86% at 115 VAC o >0.9 PF, meets EN61000-3-2 Class C 0-10 V analog dimming o >1000:1 dimming range Low cost, low component count and small printed circuit board footprint o No current sensing required o Frequency jitter for smaller, lower cost EMI filter components Integrated protection and reliability features o Output open circuit / output short-circuit protected with auto-recovery o Line input overvoltage shutdown extends voltage withstand during line faults. o Auto-recovering thermal shutdown with large hysteresis protects both components and printed circuit board 
圖1.14W PWM-模擬調(diào)光LED驅(qū)動器外形圖:上:頂視圖,下:底視圖 14W PWM-模擬調(diào)光LED驅(qū)動器主要指標:
圖2.14W PWM-模擬調(diào)光LED驅(qū)動器電路圖 14W PWM-模擬調(diào)光LED驅(qū)動器材料清單:
圖3.變壓器框圖
圖3.14W PWM-模擬調(diào)光LED驅(qū)動器PCB布局圖:上:頂層,下:低層 詳情請見: 
der263[1].pdf
(8.47 MB)
|
|
LNK406EG：14W PWM模擬調(diào)光LED驅(qū)動方案 Powerint的參考設(shè)計DER263是采用LinkSwitchTM-PH系列LNK406EG的14W PWM-模擬調(diào)光LED驅(qū)動器，LED串的電壓電流為28V/500A，輸入電壓范圍從90VAC~265VAC，高效率，230VAC時的PFC大于87%，115VAC時的PFC大于86%，功率因素大于0.9，滿足EN61000-3-2 Class C，1000:1調(diào)光范圍。 電路可驅(qū)動28VLED串電壓（500 mA），輸入電壓范圍從90 VAC~265 VAC。該LED驅(qū)動器采用了LinkSwitch-PH系列的LNK406EG。 表1 14W PWM-模擬調(diào)光LED驅(qū)動器主要指標
模擬調(diào)光是通過外部二級模擬控制信號（0V~10V）進行控制，0V為最低亮度，10V為最大亮度。模擬控制信號被傳送到初級端，并控制LNK406EG的反饋電流IFB，反過來又控制驅(qū)動器的輸出功率/光輸出，同時又保持高功率因數(shù)和低THD。 其有源負載電路和控制用以擴大調(diào)光比（1000:1以上），但如果不需要擴展調(diào)光也可以省略。
圖1 14W PWM-模擬調(diào)光LED驅(qū)動器電路圖 14W PWM-模擬調(diào)光LED驅(qū)動器主要特性 •效率高，功率因數(shù)校正 – >87％230 VAC時，> 86％在115 VAC – >0.9PF，符合EN61000-3-2 C級 – -10V模擬調(diào)光 • >1000:1的調(diào)光范圍 •低成本，低元件數(shù)量，和小印刷電路 板面積 •無需電流傳感 •頻率抖動更小，成本更低的EMI濾波器元件 •綜合保護與功能可靠 •輸出開路/輸出短路保護，自動恢復 •線輸入過壓關(guān)斷，在線路故障時延伸耐壓性。 –自動恢復與熱關(guān)斷，大范圍元件和 印刷電路板的滯后保護 |
