MPS MP2483 Manual de usuario

EV2483DQ-00C

2.5A, 55V, Programmable Frequency

White LED Driver Evaluation Board

EV2483DQ-00C Rev.1.1 www.MonolithicPower.com 1

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The Future of Analog IC Technology

DESCRIPTION

The MP2483 is a 55V, 2.5A, white LED driver

suitable for either step-down or inverting

step-up/down applications. It achieves 2.5A

peak output current over a wide input supply

range with excellent load and line regulation.

Current mode operation provides fast transient

response and eases loop stabilization. Fault

condition protection includes thermal shutdown,

cycle-by-cycle peak current limiting, input over

voltage protection, open strings protection and

output short circuit protection.

The MP2483 incorporates both DC and PWM

dimming onto a single control pin. The separate

input reference ground pin allows for direct

enable and/or dimming control for a positive to

negative power conversion.

The MP2483 requires a minimum number of

readily available standard external components

and is available in 10-pin 3mm x 3mm QFN

packages.

MP2483DQ DEMO BOARDS

Board number Operating

Mode Input

(V) LED# ILED

(mA)

EV2483DQ-00A Buck 15~50 3 700

EV2483DQ-00B Buck-boost 12 3~5 500

EV2483DQ-00C Boost 12 6~9 500

ELECTRICAL SPECIFICATIONS

Parameter Symbol Value Units

Input Voltage VIN 12 V

LEDs # 6~9

LED Current ILED 500 mA

FEATURES

•2.5A Maximum Output Current

•Unique Step-up/down Operation (Buck-

Boost Mode)

•Wide 4.5V to 55V Operating Input Range for

Step-Down Applications (Buck Mode)

•0.28ΩInternal Power MOSFET Switch

•Adjustable Switching Frequency

•Analog and PWM Dimming

•0.198V Reference Voltage

•5μA Shutdown Mode

•No minimum LED required

•Stable with Low ESR Output Ceramic

Capacitors

•Cycle-by-Cycle Over Current Protection

•Thermal Shutdown Protection

•Open Strings Protection

•Input Over Voltage Protection

•Output Short Circuit Protection

•Available in 10-Pin 3x3 QFN Package

APPLICATIONS

•General LED Illuminations

•LCD Backlight Panels

•Handheld Computers

•Automotive Internal Lighting

•Portable Multimedia Players

•Portable GPS Devices

For MPS green status, please visit MPS website under Quality Assurance.

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

Monolithic Power Systems, Inc.

EV2483DQ-00C 2.5A, 55V, PROGRAMMABLE FREQUENCY WHITE LED DRIVER

EV2483DQ-00C Rev.1.1 www.MonolithicPower.com 2

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EV2483DQ-00C EVALUATION BOARD

(L x W x H) 5cm x 4.5cm x 0.7cm

Board Number MPS IC Number

EV2483DQ-00C MP2483DQ

EV2483DQ-00C 2.5A, 55V, PROGRAMMABLE FREQUENCY WHITE LED DRIVER

EV2483DQ-00C Rev.1.1 www.MonolithicPower.com 3

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EVALUATION BOARD SCHEMATIC

EV2483DQ-00C BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer Manufacturer P/N

1C1 1μFCeramic Capacitor,100V,X7R 1210 Murata GRM32ER72A105KA0

2C2,

C3 2.2μFCeramic Capacitor,100V,X7R 1210 Murata GRM32ER72A225KA3

2C4,

C5 1n Ceramic Capacitor,50V,X7R 0603 TDK C1608X7R1H102K

1C6 100n Ceramic Capacitor,50V,X7R 0603 TDK C1608X7R1H104K

1C7 NC 1210

1D1 B360 Diode Schottky SMA Diodes Inc. B360A

1D2 NC SMA

1L1 10μHInductor 3.7A,22mOhm SM TOKO DH124C-1010ASW-

100M

10μHInductor 3.8A, 35mOhm SM Cooper DR1040-100-R

10μHinductor 3.8A, 28mOhm SM TDK VLF10040-100M3R8

1R4 1k resistor, 1% 0603 Yageo RC0603JR-071kL

2R1,

R5 0resistor, 1% 0603 Yageo RC0603JR-070RL

2R2,

R10 10kΩresistor, 1% 0603 Yageo RC0603FR-0710kL

1R3 75kΩresistor, 1% 0603 Yageo RC0603FR-0775kL

2R6,

R8 NC 0805

1R7 400m resistor, 1% 0805 ROYALOHM 0805F400LT5E

1R9 180kΩresistor, 1% 0603 Yageo RC0603FR-07180kL

1U1 MP24

83DQ

MPS WLED Driver, 2.5A,

55V,

frequency programmable QFN3*3 MPS MP2483DQ

EV2483DQ-00C 2.5A, 55V, PROGRAMMABLE FREQUENCY WHITE LED DRIVER

EV2483DQ-00C Rev.1.1 www.MonolithicPower.com 4

04/26/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Layer

Figure 2—Bottom Layer

EV2483DQ-00C 2.5A, 55V, PROGRAMMABLE FREQUENCY WHITE LED DRIVER

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.

EV2483DQ-00C Rev.1.1 www.MonolithicPower.com 5

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QUICK START GUIDE

1. Connect the load (6~9LEDs) to the output. The Anode of the load to “LED+_Boost” and the

Cathode of the load to “LED -”.

2. Connect the input voltage source to the input VIN and INGND. The input voltage source should be

initialed 12V.

3. Connect the EN or dimming signal to EN/Dim pin.

For PWM dimming, connect the PWM signal to EN/Dim pin, the high level should be higher than

1.4V, the low level should be lower than 0.7V.

For analog dimming, connect a DC dimming signal in range of 0.7V~1.4V to EN/Dim pin.

4. Power up the input voltage source, and then power up the EN/Dim signal, the LEDs should be

ignited.

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