MP1523DT [MPS]

6 White LEDs, 20mA Precision WLED Driver Evaluation Board; 6个白光LED ， 20毫安精密WLED驱动器评估板


型号：	MP1523DT
厂家：	MONOLITHIC POWER SYSTEMS
描述：	6 White LEDs, 20mA Precision WLED Driver Evaluation Board 6个白光LED ， 20毫安精密WLED驱动器评估板显示驱动器驱动程序和接口接口集成电路光电二极管
文件：	总4页 (文件大小：124K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

EV0035

6 White LEDs, 20mA Precision

WLED Driver Evaluation Board

The Future of Analog IC Technology

DESCRIPTION

FEATURES

The EV0035 is the evaluation board for the

MP1523, which is designed for driving up to six

(6) series WLEDs from a single cell Lithium Ion

battery. The board is set up to obtain 20mA

LED current. The current can be adjusted by

varying the resistor R2.

•

2.7V to 25V Input Voltage Range

Drives up to 6 Series White LEDs

Surface-Mount Components

Fully Assembled and Tested

APPLICATIONS

•

Cell Phones

The MP1523 uses current limited, variable

frequency architecture to regulate the LED

current while maintaining high efficiency. The

BIAS pin measures the output voltage and turns

off the converter if an over voltage condition is

present to prevent damage due to an open

circuit condition. The LED current is measured

with an external current sense resistor. The low

0.4V full-scale regulation threshold and 0.5Ω

power switch minimize power loss to improve

efficiency.

Handheld Computers and PDAs

Digital Still and Video Cameras

Small LCD Displays

“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic

Power Systems, Inc.

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Value

2.7 – 25

up to 6

Units

Input Voltage

# of WLEDs

LED Current

V_IN

I_LED

EV0035 EVALUATION BOARD

Efficiency vs V

(L x W x H) 2.0” x 1.4” x 0.5”

(5.0cm x 3.5 x 1.2cm)

2.5

3.0

3.5

(V)

4.0

4.5

Board Number

MPS IC Number

MP1523DT

EV0035_AC01

EV0035

EV0035 Rev. 1.2

3/30/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EV0035 – 6 WHITE LEDs, 20mA PRECISION WLED DRIVER EVALUATION BOARD

EVALUATION BOARD SCHEMATIC

MBR0540

VCC

GND

LED1

LED2

LED3

LED4

LED5

LED6

MP1523

GND

BIAS

10nF

GND

EV0035_S01

EV0035 BILL OF MATERIALS

Qty

Ref

C1, C2

Value Description

1µF Ceramic Cap., 50V, X7R

10nF Ceramic Cap., 50V, X7R

Package Manufacturer Part Number

1206

0603

TDK

C3216X7R1H105K

C1608X7R1H103K

Diode Schottky, 40V, 500mA SOD-123

Not Stuffed

MBR0540T1

Semiconductor

LED1 to

LED6

15µH Inductor, 450mA

100kΩ Film Res., 5%

SMD

0603

Sumida

CDRH3D16-150NC

ERJ-3GEYJ104V

ERJ-3GEYJ200V

MP1523DT

Panasonic

20Ω

Film Res., 5%

White LED Driver

SOT23-5 MPS

EV0035 Rev. 1.2

3/30/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EV0035 – 6 WHITE LEDs, 20mA PRECISION WLED DRIVER EVALUATION BOARD

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer

Figure 2—Top Layer

Figure 3—Bottom Layer

EV0035 Rev. 1.2

3/30/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EV0035 – 6 WHITE LEDs, 20mA PRECISION WLED DRIVER EVALUATION BOARD

QUICK START GUIDE

1. Solder LED1 – LED6 onto the board.

2. Connect VCC to the power source’s positive output.

3. Connect GND to supply ground.

4. Remove the jumper J1 to allow the MP1523 to automatically start when power is applied. Place the

shorting clip across J1 to disable the MP1523. A logic signal may be applied to EN to

enable/disable the MP1523, provided the shorting clip is not installed across J1.

5. To dim the LEDs, remove the shorting clip from J1 and apply a PWM signal to the EN pin. Adjusting

the duty cycle of the PWM signal determines the brightness of the LEDs.

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV0035 Rev. 1.2

3/30/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

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