MP1517DR中文资料

EV0043 (MP1517)

3A, 25V, 1.1MHz

Step-Up Converter for WLED Applications

EVALUATION BOARD

The Future of Analog IC Technology

DESCRIPTION

The EV1517 is the evaluation board used to demonstrate the white LED driver capabilities of the MP1517. The low 0.7V feedback voltage offers higher efficiency in white LED driver applications including cell phone camera flash. Soft-start, cycle-by-cycle current limiting and input under voltage lockout prevent overstressing or damage to sensitive external circuitry at startup and output short-circuit conditions. Current-mode regulation and external compensation components allow the MP1517 control loop to be optimized over a wide variety of input voltages, output voltages and load current conditions.

ELECTRICAL SPECIFICATIONS

Parameter Symbol Value Units Input Voltage (1)

V IN

2.6 to 5.5V

LED Current (Torch) I OUT1 20 mA LED Current (Flash)

I OUT2 150

mA Note:

1) 5.5V input voltage limit is specific to the application circuit on this

evaluation board. The input voltage limit of the MP1517 is 25V.

FEATURES

? 4A Peak Current Limit

?

Low 700mV Feedback Threshold ? Internal 150m ? Power Switch ? Input Range of 2.6V to 25V ? 95% Efficiency

? Zero Current Shutdown Mode ? Under Voltage Lockout Protection ? Open Load Protection ? Soft-Start Operation ? Thermal Shutdown

? Tiny QFN16 (4mm x 4mm) Package

APPLICATIONS

? Boost and SEPIC Regulators ? Handheld Computers

? Cell Phone Camera Flash, PDAs ? Digital Still and Video Cameras

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.

EV0043 EVALUATION BOARD

Dimensions (2.5”X x 2.0”Y x 0.4”Z) Board Number

MPS IC Number

EV0043 MP1517DR

V GATE 2V/div.

V OUT 10V/div.

20ms/div.

EV0043_TPC01

Waveform in Flash Mode

EV0043 (MP1517) – 3A, 25V, 1.1MHz STEP-UP CONVERTER FOR WLED APPLICATIONS

EVALUATION BOARD

EVALUATION BOARD SCHEMATIC

GATE

EN

EV0043 BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer P/N Distributor P/N 1 C1 4.7uF

Capacitor, 25V, Ceramic X5R

1210 Panasonic

ECJ-4YB1E475K Digikey

PCC2251CT-ND 2 C2, C4 NS Do Not Stuff

1 C3 10uF

Capacitor, 6.3V

Ceramic X5R 1210 Taiyo-Yuden

JMK325BJ106MF

1 C7 47nF

Capacitor, 25V,

Ceramic X7R 0603 Panasonic

ECJ-1VB1E473K

Digikey

PCC1771CT-ND

1 D1

Schottky Diode,

0.5A, 40V

SOD123

ON Semi MBR0540T1 Digikey MBR0540T1OSCT-ND 1 L1 4.7uH Inductor, 5.6A

Sumida

CDRH8D43-4R7NC

4 LED1, LED2, LED3, LED4 White LED, 40MCD 1206

Lumex SML-LX23UWC-TR Digikey 67-1607-1-ND

1 Q1 N-Channel MOSFET SOT23-6

Zetex ZXMN6A08E6TA Digikey

ZXMN6A08E6CT-ND 1 R1 2.2k ? Film Resistor, 5% 0603

Panasonic ERJ-3GEYJ222V Digikey

P2.2KGCT-ND 2 R2, R3 0 Film Resistor, 5% 0603

Yageo 9C06032A0R00JLHFT Digikey

311-0.0GCT-ND 1 R4 34.8? Film Resistor, 1% 0805

Panasonic ERJ-6ENF34R8V Digikey

P34.8CCT-ND 1 R5 5.11? Film Resistor, 1% 0805

Yageo 9C08052A5R11FGHFT Digikey

311-5.11CCT-ND 1 U1 Step-Up Converter QFN16 MPS

MP1517DR

EV0043 (MP1517) – 3A, 25V, 1.1MHz STEP-UP CONVERTER FOR WLED APPLICATIONS

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.

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer

Figure 2—Top Layer

Figure 3—Bottom Layer

QUICK START GUIDE

1. Connect LEDs to LED1 to LED4 terminals.

2. Connect positive and negative terminals of the 2.5V to 5.5V power supply to the IN and GND

pins, respectively. 3. Drive GATE of Q1 with a pulsed signal to switch between two (2) LED currents.

4. The device is automatically enabled because EN is connected to IN through a 0? resistor (R2).

It will be disabled only if V IN is removed.