< /a>LED" title="LED">LED" title="LED"> LED驱动器,LED电流可设定为350mA,700mA和1A,效率约90%,输入电压88V到265VAC,110VAC适得其反功率因素为0.99,230VAC为0.98V,通用的PWM调光输入,亮度调整在0%到100%之间,和EN55015与EN61000-3-2兼容.本文介绍了L6562A主要特性,方框图,以及80W LED驱动演示板STEVAL-ILL013V1主要特性,框图,改进型设计电路和材料清单.

L6562A: Transition-mode PFCcontroller

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 应用:

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

图1. L6562A方框图

图2. EVL6562A-400W电路图

带PFC的80W LED驱动演示板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

图3.STEVAL-ILL013V1演示板外形图

图4.STEVAL-ILL013V1演示板方框图

图5.高PF升压转换器设计概念图

图6.带调光的改进型降压转换器

图7.采用L6562A的高PFC升压转换器电路图

图8.采用L6562A的改进型降压转换器电路图

图9.零调光的改进型设计图
STEVAL-ILL013V1演示板材料清单:


详情请见:
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