250VAC离线LED驱动解决方案

关键词： ED驱动 , IR , IRS2980 , 离线

IR公司的IRS2980采用该公司的控制和高压技术,实现简单高性能调光LED驱动解决方案,包括调光LED驱动控制器,滞后电流调整,闭环LED电流调光控制,模拟/PWM调光输入,集成了高压稳压器,250uA微功耗起动,主要用在LED照明/CFL替代灯以及LED驱动模块.本文介绍了IRS2980主要特性,方框图, 应用电路图以及90-250VAC离线LED驱动器IRPLLED7参考设计主要特性,方框图, 电路图和材料清单.

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驱动器系统特性:

• 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典型应用:

• LED incandescent/CFL replacement lamps

• LED driver module

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图1. IRS2980方框图

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图2. IRS2980应用电路图

采用IRS2980的90-250VAC离线LED驱动器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.

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图3. 90-250VAC离线LED驱动器外形图

90-250VAC离线LED驱动器主要特性:

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

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