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[原创] IDT ZSLS7025高亮LED升压控制方案

关键词:电源管理 DC/DC转换器 LED驱动器 ZSLS7025

时间:2017-03-21 10:35:49       作者:IDT       来源:中电网

IDT公司的ZSLS7025是ZSLS LED控制IC系列产品,是用于高亮度LED的恒流升压转换器,输入电压从5V到100V,输出电流从几毫安到2A或更高.控制回路具有PWM架构,支持PWM或线性电压调光,效果显著高达95%,主要用在MR16照明,翻新照明, SELV照明,信号牌和户外照明,建筑物照明,LED背景光和通用低压工业和消费电子应用.本文介绍了ZSLS7025主要特性和优势,功能框图,应用电路,以及演示板ZSLS7025PCB-D1V1主要特性和优势,电路图和材料清单.

The ZSLS7025, one of the ZSLS Family of LED control ICs, is a constant current boost converter designed for driving high-brightness LEDs. It is optimal for driving multiple white LEDs connected in series so that the LED current is uniform for better brightness and color control. The wide input range and high output current enables diverse industrial, after-market automotive, and consumer lighting applications. The ZSLS7025 output current is adjustable via an external current sense resistor and can deliver stable constant output current from a few milliamps up to 2A or higher. The ZSLS7025 drives a constant current into the load. The control loop features a pulse frequency modulated (PFM) architecture that is inherently stable and does not need loop compensation. The ZSLS7025 supports pulse-width modulation (PWM) or linear voltage dimming, which allows flexible control of the LED luminance. The ZSLS7025 can operate in applications with a wide input voltage range from 5V to 100V. An integrated over-voltage protection (OVP) circuit protects the system, even under no-load conditions. The over-voltage protection is adjustable via external resistors R1 and R2.

ZSLS7025主要特性:

Wide application input voltage range: 5V to 100V (higher voltages also supported as described in section 2.1 in the data sheet)

Constant current output limited only by external component selection

No loop compensation required

Internal over-voltage protection

Internal over-temperature protection

Brightness control via PWM or DC voltage control signal input

SOP-8 package

ZSLS7025主要优势:

High efficiency: up to 95%

Minimum bill of materials

Small form-factor package

ZSLS7025物理特性:

• Junction temperature: -40°C to 125°C

• RoHS compliant

ZSLS7025主要应用:

图1.ZSLS7025功能框图

图2.ZSLS7025典型应用电路

图3.ZSLS7025应用设计案例:RF滤波器PWM调光电路

演示板ZSLS7025PCB-D1V1

The Demonstration Board contains a standard 4-pin terminal connector to allow the user to easily connect and supply an LED board. The Demonstration Board also has two LED power pads (LED+ and LED-) to provide more flexibility in supplying a power LED or LED string.

The board includes an external power MOSFET switch. The layout with any switching regulator is crucial to minimize radiated EMI. A shielded inductor is selected to minimize radiated EMI. This reference design keeps the critical trace lengths to a minimum. The ground plane has been maximized around critical areas.

演示板ZSLS7025PCB-D1V1主要特性和优势:

• Wide input voltage range (see section 2.4)

• Standard 2.54mm 4-pin header for attaching LEDs and additional duplicate surface-mounted device (SMD) pads (LED- , LED+)

• Standard 2.54mm 2-pin male header and alternative duplicate SMD pads for power supply

• Standard 2.54mm 3-pin male header for dimming the LED brightness with an external PWM signal or DC control voltage

• All devices are SMD and on the same side of the board (as shown in the top view given in Figure 2.1)

• Maximized power ground copper on top and bottom sides to minimize radiated EMI

• Cooling pad (bottom layer) with many vias for the power MOSFET switch

• The high current paths are as short as possible to ensure system precision and efficiency

• No ground plane under the EMI radiated components to prevent noise injection in the ground plane

演示板ZSLS7025PCB-D1V1包括:

• ZSLS7025PCB-D1V1 Demonstration Board v.X (where X refers to the current version)

• Five ZSLS7025 samples, SOP8

• ZLED-PCB10 Test PCB with 12 white 0.5W LEDs

• ZSLS7025PCB-D1V1 Demonstration Kit Start-up Information

• Kit Disclaimer

图4.演示板ZSLS7025PCB-D1V1外形图

图5.演示板ZSLS7025PCB-D1V1电路图

演示板ZSLS7025PCB-D1V1材料清单:

详情请见:

http://www.idt.com/products/power-management/led-drivers/zsls7025-boost-led-driver

IDT_ZSLS7025_DST_20160420.pdf

IDT_ZSLS7025PCB-D1V1-Demo-Kit-Description-160419_MAN_20160422.pdf

 

 

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