</a>LED" title="LED">LED" title="LED">LED驅動器,LED電流可設定為350mA,700mA和1A,效率約90%,輸入電壓88V到265VAC,110VAC適得其反功率因素為0.99,230VAC為0.98V,通用的PWM調光輸入,亮度調整在0%到100%之間,和EN55015與EN61000-3-2兼容.本文介紹了L6562A主要特性,方框圖,以及80W LED驅動演示板STEVAL-ILL013V1主要特性,框圖,改進型設計電路和材料清單.

L6562A: Transition-mode PFC controller

The L6562A is a current-mode PFC controller operating in Transition Mode (TM). Coming with the same pin-out as its predecessors L6561 and L6562, it offers improved performance.

The highly linear multiplier includes a special circuit, able to reduce AC input current distortion,that allows wide-range-mains operation with an extremely low THD, even over a large load range.

The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% @TJ = 25℃) internal voltage reference.

The device features extremely low consumption (60μA max. before start-up and <5 mA operating) and includes a disable function suitable for IC remote ON/OFF, which makes it easier to comply with energy saving requirements (Blue Angel, EnergyStar, Energy2000,etc.).An effective two-step OVP enables to safely handle overvoltages either occurring at start-up or resulting from load disconnection.

The totem-pole output stage, capable of 600 mA source and 800 mA sink current, is suitable to drive high current MOSFETs or IGBTs. This, combined with the other features and the possibility to operate with the proprietary Fixed-Off-Time control, makes the device an excellent low-cost solution for EN61000-3-2 compliant SMPS in excess of 350W.

L6562A主要特性:

■ Proprietary multiplier design for minimum THD

■ Very accurate adjustable output overvoltage protection

■ Ultra-low (30μA) Start-up current

■ Low (2.5mA) quiescent current

■ Digital leading-edge blanking on current sense

■ Disable function on E/A input

■ 1% (@ TJ = 25 ℃) internal reference voltage

■ -600/+800mA totem pole gate driver with active pull-down during UVLO and voltage clamp

■ DIP-8/SO-8 packages

L6562A 應用:

PFC pre-regulators for:

■ IEC61000-3-2 compliant SMPS (Flat TV, monitors, desktop PC, games)

■ HI-END AC-DC adapter/charger up to 400W

■ Electronic ballast

■ Entry level server & web server

圖1. L6562A方框圖

圖2. EVL6562A-400W電路圖

帶PFC的80W LED驅動演示板STEVAL-ILL013V1

ST The use of high power LEDs in lighting applications is becoming increasingly popular due to rapid improvements in lighting efficiency, longer life, higher reliability and overall cost effectiveness. Dimming functions are more easily implemented in LEDs, and they are more robust and offer wider design flexibility compared to other light sources.

For this reason a demonstration board for driving high brightness and power LEDs has been developed. The STEVAL-ILL013V1 demonstration board is an 80 W offline dimmable LED driver with high power factor (PF) intended for fixed number of LEDs, the overall design of which is described in detail in this user manual.

The LED current can be set to 350 mA, 700 mA and 1000 mA, using jumpers. Additionally, a dimming function using a PWM (pulse width modulation) signal is implemented as well, allowing the user to set the LED brightness from 0% up to 100%. The demonstration board can be ordered using order code STEVAL-ILL013V1, and is shown in Figure 1.

STEVAL-ILL013V1主要特性:

■ 80 W LED driver

■ 350 mA, 700 mA and 1 A LED current settings

■ High efficiency (~90%)

■ Wide input voltage range: 88 to 265 VAC

■ High power factor: 0.99 for 110 VAC and 0.98 for 230 VAC

■ Universal PWM input for dimming (external board required)

■ Non-isolated SMPS

■ Brightness regulation between 0% and 100%

■ EMI filter implemented

■ EN55015 and EN61000-3-2 compliant

圖3.STEVAL-ILL013V1演示板外形圖

圖4.STEVAL-ILL013V1演示板方框圖

圖5.高PF升壓轉換器設計概念圖

圖6.帶調光的改進型降壓轉換器

圖7.采用L6562A的高PFC升壓轉換器電路圖

圖8.采用L6562A的改進型降壓轉換器電路圖

圖9.零調光的改進型設計圖
STEVAL-ILL013V1演示板材料清單:


詳情請見:
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00151385.pdf
和
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/USER_MANUAL/CD00222931.pdf