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| FL7733A 8.4W通用輸入LED驅(qū)動設(shè)計方案 |
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| 文章來源： 更新時間：2014/11/27 15:01:00 |
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Fairchild公司的FL7733A是具有初級邊穩(wěn)壓(PSR)技術(shù)的高度集成PWM控制器,能最大限度降低中低功率LED照明轉(zhuǎn)換器的元件.所有條件下的恒流誤差±3%,通用輸入電壓變化±1%,磁性電感變化±20%是為±1%,負載電壓50%到100%變化是為±1%,輸入電壓80 VAC - 308 VAC,PF達0.9,并具有多種保護特性.本文介紹了FL7733A主要特性和框圖,典型應(yīng)用電路, 50W設(shè)計案例電路圖和材料清單,以及通用輸入8.4W LED驅(qū)動器電路圖,材料清單和PCB設(shè)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
圖2. FL7733A典型應(yīng)用電路圖
圖3. FL7733A 50W設(shè)計案例電路圖
50W設(shè)計案例材料清單:
圖4. FL7733A通用輸入8.4W LED驅(qū)動器外形圖(頂視圖)
圖5. FL7733A通用輸入8.4W LED驅(qū)動器外形圖(底層)
圖6. FL7733A通用輸入8.4W LED驅(qū)動器電路圖
通用輸入8.4W LED驅(qū)動器材料清單:
圖7. FL7733A通用輸入8.4W LED驅(qū)動器PCB設(shè)計圖(頂層)
圖8. FL7733A通用輸入8.4W LED驅(qū)動器PCB設(shè)計圖(底層) |
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