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| FL7733A 通用電壓輸入50W LED驅動解決方案 |
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| 文章來源： 更新時間：2015/3/13 9:41:00 |
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Fairchild公司的FL7733A是采用先進的初級邊調整(PSR)的高度集成PWM控制器,最大限度地降低中低功率LED照明轉換器的元件數量.所有條件下的總電流誤差小于±3%,通用輸入電壓80 VAC-308 VAC變化小于±1%,從50%到100%的負載變化小于±1%,磁性電感變化±20%輸出變化小于±1%.本文介紹了FL7733A主要特性,框圖,50W LED驅動器主要指標,電路圖,材料清單和PCB設計圖.
The FL7733A is a highly-integrated PWM controller with advanced Primary-Side Regulation (PSR) technique to minimize components in low-to-mid-power LED lighting converters.
Using an innovative TRUECURRENT® technology to provide tight tolerance constant-current output, this LED driver enables designs with constant current (CC) tolerance of less than ±1% over the universal line voltage range to meet stringent LED brightness requirements.
By minimizing turn-on time fluctuation, high power factor and low THD over the universal line range are obtained in the FL7733A. An integrated high-voltage startup circuit implements fast startup and high system efficiency. During startup, adaptive feedback loop control anticipates the steady-state condition and sets initial feedback condition close to the steady state to ensure no overshoot or undershoot of LED current.The FL7733A also provides powerful protections, such as LED short / open, output diode short, sensing resistor short / open, and over-temperature for high system reliability.
The FL7733A controller is available in an 8-pin Small-Outline Package (SOP).
FL7733A主要特性:
Performance
< ±3% Total Constant Current Tolerance Over All Conditions
< ±1% Over Universal Line Voltage Variation
< ±1% from 50% to 100% Load Voltage Variation
< ±1% with ±20% Magnetizing Inductance Variation
Primary-Side Regulation (PSR) Control for Cost-Effective Solution without Requiring Input Bulk Capacitor and Secondary Feedback Circuitry
Application Input Voltage Range: 80 VAC-308 VAC
High PF of > 0.9, and Low THD of < 10% Over Universal Line Input Range
Fast < 200 ms Start-up (at 85 VAC) using Internal High-Voltage Start-up with VDD Regulation
Adaptive Feedback Loop Control for Startup without Overshoot
System Protection
LED Short / Open Protection
Output Diode Short Protection
Sensing Resistor Short / Open Protection
VDD Over-Voltage Protection (OVP)
VDD Under-Voltage Lockout (UVLO)
Over-Temperature Protection (OTP)
All Protections are Auto Restart (AR)
Cycle-by-Cycle Current Limit
圖1.FL7733A框圖
通用輸入電壓50W LED驅動器
50 W LED Driver with Ultra-Wide OutputVoltage Range at Universal Line
This user guide supports the evaluation kit for the FL7733A. It should be used in conjunction with the FL7733A datasheet as well as Fairchild’s application notes and technical support team.
This document describes a solution for an universal AC input voltage LED driver using the FL7733A Primary-Side Regulation (PSR) single-stage controller. The input voltage range is 90 VRMS ~ 277 VRMS and there is one DC output with a constant current of 1.0 A at 50 V. This document contains a general description of the FL7733A, the power supply solution specification, schematic, bill of materials, and typical operating characteristics.
圖2.通用輸入電壓50W LED驅動器外形圖
50W LED驅動器主要指標:
圖3.通用輸入電壓50W LED驅動器電路圖
通用輸入電壓50W LED驅動器材料清單:
圖4.50W LED驅動器PCB設計圖 |
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