</a>LED" title="LED">LED" title="LED">LED驅(qū)動(dòng)解決方案,包括調(diào)光LED驅(qū)動(dòng)控制器,滯后電流調(diào)整,閉環(huán)LED電流調(diào)光控制,模擬/PWM調(diào)光輸入,集成了高壓穩(wěn)壓器,250uA微功耗起動(dòng),主要用在LED照明/CFL替代燈以及LED驅(qū)動(dòng)模塊.本文介紹了IRS2980主要特性,方框圖, 應(yīng)用電路圖以及90-250VAC離線LED驅(qū)動(dòng)器IRPLLED7參考設(shè)計(jì)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(qū)動(dòng)器系統(tǒng)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(yīng)用:

• LED incandescent/CFL replacement lamps

• LED driver module

圖1. IRS2980方框圖

圖2. IRS2980應(yīng)用電路圖

采用IRS2980的90-250VAC離線LED驅(qū)動(dòng)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.


圖3. 90-250VAC離線LED驅(qū)動(dòng)器外形圖

90-250VAC離線LED驅(qū)動(dòng)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

圖4.90-250VAC離線LED驅(qū)動(dòng)器IRPLLED7方框圖

圖5. IRPLLED7電路圖
90-250VAC離線LED驅(qū)動(dòng)器IRPLLED7材料清單:

詳情請(qǐng)見:
http://www.irf.com/product-info/datasheets/data/irs2980spbf.pdf
和
http://www.irf.com/technical-info/appnotes/an-1171.pdf