MPS EV0035 Manuel utilisateur

EV0035

6 White LEDs, 20mA Precision

WLED Driver Evaluation Board

EV0035 Rev. 1.2 www.MonolithicPower.com 1

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The Future of Analog IC Technology

DESCRIPTION

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.

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.

ELECTRICAL SPECIFICATIONS

Parameter Symbol Value Units

Input Voltage VIN 2.7 – 25 V

# of WLEDs up to 6

LED Current ILED 20 mA

FEATURES

•2.7V to 25V Input Voltage Range

•Drives up to 6 Series White LEDs

•Surface-Mount Components

•Fully Assembled and Tested

APPLICATIONS

•Cell Phones

•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.

EV0035 EVALUATION BOARD

(L x W x H) 2.0” x 1.4” x 0.5”

(5.0cm x 3.5 x 1.2cm)

Board Number MPS IC Number

EV0035 MP1523DT

EFFICIENCY (%)

2.5 3.0 3.5 4.0 4.5

(V)

EV0035_AC01

Efficiency vs VIN

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

EV0035 Rev. 1.2 www.MonolithicPower.com 2

3/30/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EVALUATION BOARD SCHEMATIC

EV0035_S01

MP1523

GND

BIAS

LED1

LED2

LED3

LED4

LED5

LED6

MBR0540

VCC

GND

GND C3

10nF

EV0035 BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer Part Number

2 C1, C2 1µF Ceramic Cap., 50V, X7R 1206 TDK C3216X7R1H105K

1 C3 10nF Ceramic Cap., 50V, X7R 0603 TDK C1608X7R1H103K

1 D1 Diode Schottky, 40V, 500mA SOD-123 ON

Semiconductor MBR0540T1

6 LED1 to

LED6 Not Stuffed

1 L1 15µH Inductor, 450mA SMD Sumida CDRH3D16-150NC

1 R1 100kΩFilm Res., 5% 0603 Panasonic ERJ-3GEYJ104V

1 R2 20ΩFilm Res., 5% 0603 Panasonic ERJ-3GEYJ200V

1 U1 White LED Driver SOT23-5 MPS MP1523DT

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

EV0035 Rev. 1.2 www.MonolithicPower.com 3

3/30/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer Figure 2—Top Layer

Figure 3—Bottom Layer

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

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 www.MonolithicPower.com 4

3/30/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

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.

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