MPS EV3205DJ-00A Istruzioni operative e di manutenzione

EV3205DJ-00A

1.3MHz Fixed Frequency

5 White LED Driver

EVALUATION BOARD

EV3205DJ-00A Rev. 1.1 www.MonolithicPower.com 1

7/13/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

GENERAL DESCRIPTION

The MP3205 is a step-up converter designed

for driving up to 5 series white LEDs from a

single cell Lithium Ion battery. The MP3205

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 MP3205 includes under-voltage lockout,

current limiting and thermal overload protection

preventing damage in the event of an output

overload. The MP3205 is available in a small

5-pin TSOT23 package.

ELECTRICAL SPECIFICATION

Parameter Symbol Value Units

Input Voltage VIN 2.5 to 6 V

Number of WLEDs 5

FEATURES

•On Board Power MOSFET

•Drives Up to 5 Series White LEDs

•Up to 87% Efficiency

•Over 1MHz Fixed Switching Frequency

•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 Application

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

Monolithic Power Systems, Inc.

EV3205DJ-00A EVALUATION BOARD

Dimensions (1.9”X x 1.8”Y x 0.4”Z)

Board Number MPS IC Number

EV3205DJ-00A MP3205DJ

88

87

86

85

84

83

82

81

80

79

78

77

EFFICIENCY (%)

5 101520

LED CURRENT (mA)

MP3205-EC01

Efficiency vs

LED Current

3 LEDs

4 LEDs

VIN=3.6V

5 LEDs

EV3205DJ-00A – 1.3MHz FIXED FREQUENCY 5 WHITE LED DRIVER

EVALUATION BOARD

EV3205DJ-00A Rev. 1.1 www.MonolithicPower.com 2

7/13/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

TM

EVALUATION BOARD SCHEMATIC

OFF ON

MP3205

VIN

LED3

LED1

LED2

LED4

LED5

EV3205_S01

D1

B0530WS-7

30V

500mA

U1

IN

EN

GND

FB

SW

EV3205DJ-00A BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer Manufacturer P/N

1 C1 2.2µF Ceramic Capacitor, 10V, X5R 0805 TDK C2012X5R1A225K

1 C2 0.22µF Ceramic Capacitor, 25V, X7R 0805 TDK C2012X7R1E224K

1 D1 Diode Schottky, 30V, 0.5A SOD-323 Diodes Inc. B0530WS-7

1 L1 22µH Inductor, 330mA D31FB Toko 984FB-220M

5

LED1,

LED2,

LED3,

LED4,

LED5

Not Stuffed

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

1 R2 5.1ΩFilm Resistor, 1% 0805 Panasonic ERJ-6GEYJ5R1V

1 U1

Fixed Frequency, White Led

Driver TSOT23-5 MPS MP3205DJ

EV3205DJ-00A – 1.3MHz FIXED FREQUENCY 5 WHITE LED 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.

EV3205DJ-00A Rev. 1.1 www.MonolithicPower.com 3

7/13/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

TM

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer Figure 2—Top Layer

QUICK START GUIDE

1. Solder LED1 through LED5 to the board.

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

respectively.

3. Drive EN high to turn on the MP3205; low to shut it down.

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

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