LED驅動器采用LinkSwitchTM-PL系列LNK458KG,主要用于B10替代燈. 115 VAC輸入48V輸出時的效率大于86%,115 VAC輸入96V輸出時的效率大于87%,功率因素大于0.95,THD小于15%,起動時間小于300ms.本文介紹了LED驅動參考設計主要優(yōu)勢以及輸出48 V/90 mA, 48 V/ 60 mA和96 V/ 45 mA參考設計主要指標,電路圖和相應的材料清單.
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4.3 W Power Factor Corrected LED Driver (Non-Isolated Buck Boost) Using LinkSwitchTM-PL LNK458KG

This document is an engineering report describing a non-isolated LED driver (power supply) utilizing a LNK458KG from the LinkSwitch-PL family of devices.

The DER-297 provides a single constant current output with an output power of 4.5 W.

The board can be easily configured for output voltages from 35 V to 100 V as shown in the example table below.

The key design goals were high efficiency and small size, enabling the driver to fit into candelabra and B10 sized lamps and maximize efficacy.

The board was optimized to operate over the low AC input voltage range (85 VAC to 132 VAC, 47 Hz to 63 Hz). LinkSwitch-PL based designs provide a high power factor (>0.95) meeting current international requirements.

The form factor of the board was chosen to meet the requirements for standard B10 LED replacement lamps. The output is non-isolated and requires the mechanical design of the enclosure to isolate the output of the supply and the LED load from the user.

The design was not optimized for operation with phase controlled (TRIAC) dimmers but this is possible with some modification will reduce efficiency.

The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, design spreadsheet and performance data.

LED驅動參考設計主要特性:

? Single-stage power factor corrected and accurate constant current (CC) output

? Low cost, low component count and small PCB footprint solution

? Highly energy efficient, >86 % at 115 VAC input for 48 V and >87 % for 96 V output

? Superior performance and end user experience

? Fast start-up time (300 ms) – no perceptible delay

? Integrated protection and reliability features

? Single shot no-load protection / output short-circuit protected with auto-recovery

? Auto-recovering thermal shutdown with large hysteresis protects both components and PCB

? No damage during brown-out conditions

? PF >0.95 at 115 VAC

? %A THD 15% at 115 VAC

? Meets IEC ring wave, differential line surge and EN55015 conducted E


圖1. LED驅動參考設計外形圖

48 V, 90 mA參考設計指標:

48 V, 60 mA參考設計指標:

96 V, 45 mA參考設計指標:


圖2.48 V, 90 mA參考設計電路圖

圖3.48 V, 60 mA參考設計電路圖

圖4.96 V, 45mA參考設計電路圖
48 V, 90 mA參考設計材料清單:

48 V, 60 mA參考設計材料清單:
Make the following changes to modify the design from 48 V, 90 mA to 48 V, 60 mA.

96 V, 45 mA參考設計材料清單:
Make the following changes to modify design from 48 V, 90 mA to 96 V, 45 mA.

詳情請見:
http://www.powerint.com/sites/default/files/PDFFiles/der297.pdf