關鍵詞： ED驅動 , IR , IRS2980 , 離線

IR公司的IRS2980采用該公司的控制和高壓技術,實現簡單高性能調光LED驅動解決方案,包括調光LED驅動控制器,滯后電流調整,閉環LED電流調光控制,模擬/PWM調光輸入,集成了高壓穩壓器,250uA微功耗起動,主要用在LED照明/CFL替代燈以及LED驅動模塊.本文介紹了IRS2980主要特性,方框圖, 應用電路圖以及90-250VAC離線LED驅動器IRPLLED7參考設計主要特性,方框圖, 電路圖和材料清單.

The IRS2980 utilizes International Rectifier’s control and high-voltage technologies to realize a simple, high performance dimming LED driver solution. This solution is based on a hysteretic topology where the high frequency AC output current is controlled by adjusting the oscillator frequency and duty cycle.

IRS2980主要特性:

• Dimming LED driver controller

• Hysteretic Current Regulation

• Closed-loop LED current dimming control

• Analog/PWM Dimming Input

• Internal High Voltage Regulator

• Internal 15.6V zener clamp diode on Vcc

• Micropower startup (250μA)

• Latch immunity and ESD protection

LED驅動器系統特性:

• Single chip dimming solution

• Simple LED current dimming control method

• No external protection circuits required (fully internal)

• Easy to use for fast design cycle time

• Increased manufacturability and reliability

IRS2980典型應用:

• LED incandescent/CFL replacement lamps

• LED driver module

2011-11-8 12:43:44 上傳

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圖1. IRS2980方框圖

2011-11-8 12:43:44 上傳

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圖2. IRS2980應用電路圖

采用IRS2980的90-250VAC離線LED驅動器IRPLLED7

Solid state light sources are now available that offer viable alternatives to Fluorescent and HID lamps and far surpass incandescent lamps. Luminous efficacy expressed in Lumens per Watt has now reached levels enabling LEDs to be used for general illumination. High brightness LEDs also possess the added advantages of longer operating life span up to 50000 hours and greater robustness than other less efficient light sources making them suitable for outside applications such as street lighting.

High power LEDs are ideally driven with constant regulated DC current, requiring a "driver" or "converter" to provide the required current from an AC or DC power source. A simple single stage power converter based around the IRS2980 LED driver IC provides a controlled current output over a wide AC line or DC voltage input range.

The IRPLLED7 evaluation board is an off line non-isolated constant current Buck regulator LED driver designed to supply a 350mA DC output current. The LED output voltage can be up to 90% of the input voltage, operating from an AC line input voltage between 90 and 250VAC 50/60Hz. It also includes PWM dimming capability from 10% to 100% of light output controlled by an on board potentiometer.

2011-11-8 12:43:44 上傳

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圖3. 90-250VAC離線LED驅動器外形圖

90-250VAC離線LED驅動器主要特性:

Featuring IRS2980S HVIC LED driver

Non-isolated buck regulator

90-250V AC input voltage

0-50V DC output voltage

Regulated output current of 350mA

PWM dimmable

2011-11-8 12:43:44 上傳

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圖4.90-250VAC離線LED驅動器IRPLLED7方框圖

2011-11-8 12:43:44 上傳

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圖5. IRPLLED7電路圖
90-250VAC離線LED驅動器IRPLLED7材料清單:

2011-11-8 12:43:44 上傳

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詳情請見:

irs2980spbf.pdf (193.01 KB, 下載次數: 3)

2011-11-8 12:45:23 上傳

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下載積分: 積分 -1

和

an-1171.pdf (195.11 KB, 下載次數: 1)

2011-11-8 12:45:08 上傳

下載次數: 1
下載積分: 積分 -1