MPS EV1518DG-00A Manuale utente

EV1518DG-00A

Fixed Frequency WLED Driver

Evaluation Board

EV1518DG-00A Rev. 1.2 www.MonolithicPower.com 1

10/17/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

GENERAL DESCRIPTION

The EV1518DG-00A is an evaluation board for

the MP1518, a step-up converter designed for

driving up to 6 series white LEDs from a single

cell Lithium Ion battery. The MP1518 uses

current mode, fixed frequency architecture to

regulate the LED current, which is measured

through an external current sense resistor. Its

low 104mV feedback voltage reduces power

loss and improves efficiency. The OV pin

monitors the output voltage and turns off the

converter if an over-voltage condition is present

due to an open circuit condition.

The MP1518 includes under-voltage lockout,

current limiting and thermal overload protection

preventing damage in the event of an output

overload.

ELECTRICAL SPECIFICATIONS

Parameter Symbol Value Units

Input Voltage VIN 2.5 – 6.0 V

# of WLEDs Up to 6

LED Current ILED 20 mA

FEATURES

•On Board Power MOSFET

•Drives up to 6 Series White LEDs

•Up to 87% Efficiency

•Over 1MHz Fixed Switching Frequency

•Open Load Shutdown

•Low 104mV Feedback Voltage

•Soft Start/PWM Dimming

•UVLO, Thermal Shutdown

•Internal Current Limit

APPLICATIONS

•Cell Phones

•Handheld Computers and PDAs

•Digital Still Cameras

•Small LCD Displays

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

Power Systems, Inc.

EV1518DG-00A EVALUATION BOARD

(L x W x H) 2.0” x 1.8” x 0.4”

(5.0cm x 4.5cm x 1.0cm)

Board Number MPS IC Number

EV1518DG-00A MP1518DG

88

86

84

82

80

78

76

EFFICIENCY (%)

5 101520

LED CURRENT (mA)

Efficiency vs

LED Current

6 LEDS

3 LEDS

VIN = 3.6V

4 LEDS

EV1518DG-00A – FIXED FREQUENCY WLED DRIVER EVALUATION BOARD

EV1518DG-00A Rev. 1.2 www.MonolithicPower.com 2

10/17/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

TM

EVALUATION BOARD SCHEMATIC

VIN

EN

GND

LED1

D1

BAT54WS-7

LED2

LED3

LED4

LED5

LED6

U1

MP1518

SWIN

FB

OV

NC

EN

28

3

6

7

5

1

4

GND

GND

EV1518DG-00A BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer Manufacturer P/N

1 C1 4.7µF

Ceramic Capacitor,

6.3V, X5R 0805 TDK C2012X5R0J475M

1 C2 0.22µF

Ceramic Capacitor, 50V,

X7R 1206 TDK C3216X7R1H224K

1 D1

Diode Schottky, 30V,

200mW SOD-323 Diodes Inc BAT54WS-7

1 L1 22µH 400mA SMD Sumida CDRH3D16-220NC

6

LED1, LED2,

LED3, LED4,

LED5, LED6

Not Stuffed

1 R1 100kΩResistor, 5% 0805 Panasonic ERJ-6GEYJ104V

1 R2 4.99ΩResistor, 1% 0805 Yageo 9C08052A4R99FKHFT

1 U1 White Led Driver QFN8

(2x2) MPS MP1518DG

EV1518DG-00A – FIXED FREQUENCY WLED DRIVER EVALUATION BOARD

NOTICE: The information in this document is subject to change without notice. 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.

EV1518DG-00A Rev. 1.2 www.MonolithicPower.com 3

10/17/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

TM

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer Figure 2—Top Layer

Figure 3—Bottom Layer

QUICK START GUIDE

1. Solder LED1 – LED6 to board.

2. Connect the positive and negative terminals of the power supply (2.5V to 6V) to the VIN and

GND pins, respectively.

3. This board is set up for automatic startup. Pull EN low to shut down the MP1518.

4. To use burst mode brightness control, drive EN with a PWM signal.

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