EV1527DR-02A MPS | Alldatasheet

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Technical content

1.3MHz Low Power LED Torch/Flash Driver EVALUATION BOARD EV1527DR-02A Rev. 1.0 www.MonolithicPower.com 1 9/21/2005 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The EV1527DR-02A evaluation board is designed to drive a single Lumileds LED with low, forward voltage for Camera Flash applications. The board is set up to obtain 150mA torch current and 750mA flash current with an input voltage range of 3.0V to 4.2V. The torch and flash currents can be adjusted by resistors R2 and R3 on the Evaluation Board. The MP1527 switches at 1.3MHz and allows the use of tiny, low cost capacitors and small inductors. External compensation and soft-start result in small inrush current and extend the battery life. The MP1527 operates from an input voltage as low as 2.6V. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Supply Voltage V IN 3.0 – 4.2 V LED Current (Torch) I OUT1 150 mA LED Current (Flash) I OUT2 750 mA

FEATURES

  • 3V to 4.2V Input Voltage Range
  • Tiny Capacitors and Inductors Due to 1.3MHz Fixed Switching Frequency
  • Output LED Currents: 150mA at Torch Mode, 750mA at Flash Mode
  • Surface-Mount Components
  • Fully Assembled and Tested

APPLICATIONS

  • Camera Phone Flash
  • Handheld Computers and PDAs
  • Digital Still and Video Cameras
  • External Modems
  • Small LCD Displays
  • White LED Drivers “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV1527DR-02A EVALUATION BOARD (5.0cm x 5.6cm x 1.0cm) Board Number MPS IC Number EV1527DR-02A MP1527DR EV1527DR-02A_WF01 Load Transient VIN = 3.6V (1 LED) VFLASH 2V/div VOUT 5V/div

EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER EVALUATION BOARD EV1527DR-02A Rev. 1.0 www.MonolithicPower.com 2 9/21/2005 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC EV1527_S01 NS 47nF EN GND VIN 10nF 1N5819HW-7 1A, 40V * Note: Cut trace to install D2. NS* FLASH LED1 MP1527 COMP SGND NC NC IN FB SS FAULT SGND NC BP EN PGND PGND SW SW VIN EV1527DR-02A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number 1 C1 0.1µF Ceramic Capacitor, 16V, X7R 0603 AVX: 0603YC104KAT

1 C2 47nF Ceramic Capacitor, 25V, X7R 0603 AVX:

1 C3 10nF Ceramic Capacitor, 50V, X7R 0603 AVX:

1 C4 4.7µF Ceramic Capacitor, 10V, X5R 1210 AVX: 1210YD475KAT2W

1 C5 10µF Ceramic Capacitor, 10V, X7R 1210 AVX:

1 C6 Not Stuffed

1 D1 Schottky Diode, 1A, 40V SOD123 Diodes Inc.: 1N5819HW-7

1 D2 Not Stuffed

1 L1 3.0µH Inductor, 2.4A S Sumida: CDRH5D28-3R0NC

1 LED1 Not Stuffed

EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER EVALUATION BOARD EV1527DR-02A Rev. 1.0 www.MonolithicPower.com 3 9/21/2005 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. EV1527DR-02A BILL OF MATERIALS (continued) Qty Ref Value Description Package Manufacturer Part Number 2 Q1, Q2 N-Channel MOSFET, 4.5A, 20V SOT23-6 Zetex Inc.: ZXMN2A03E6TA

3 R1, R5, R6 100k Ω Resistor, 5% 0603 Panasonic:

1 R2 8.06 Ω Resistor, 1% 0805 Yageo: 9C08052A8R06FGHFT 1 R3 2.0 Ω Resistor, 5% 1210 Panasonic: ERJ-14YJ2R0U

1 R4 220 Ω Resistor, 5% 0603 Panasonic:

1 U1 Step-Up Converter QFN16 MPS:

EV1527DR-02A - 1.3MHZ LOW POWER LED TORCH/FLASH DRIVER EVALUATION BOARD NOTICE: The information in this document is subject to change wi thout notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights ar e not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV1527DR-02A Rev. 1.0 www.MonolithicPower.com 5 9/21/2005 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. QUICK START GUIDE 1. Connect a Lumileds DS25 to LED terminals on the EV1527DR-02A board. 2. Preset the power supply to 3V - 4.2V. 3. Turn the power supply off. 4. Connect the power supply terminals to: a. Positive (+): VIN b. Negative (–): GND 5. Connect EN to VIN. 6. Turn on the power supply after making said connections. 7. The MP1527 is enabled on the demo board once V IN is applied. 8. Drive FLASH of Q1 with a pulsed signal (3V or above for High, 0V for Low) to switch between two (2) LED currents. 9. I OUT1 is set to 150mA on the board. 10. IOUT2 is set to 750mA on the board.