EV3302DG-00A MPS | Alldatasheet
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Technical content
1.3A Fixed Frequency White LED Driver Evaluation Board EV3302DG-00A Rev. 1.1 www.MonolithicPower.com 1 10/18/2007 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The EV3302DG-00A is an evaluation board for the MP3302DG, a step-up converter designed for driving up to 27 white LEDs from a single cell lithium Ion battery. The EV board is optimized for the load of 3 white LEDs in series, 9 strings panel. The MP3302 uses current mode, fixed frequency architecture to regulate the LED current, which is measured through an external current sense resistor. Its low 208mV feedback voltage reduces power loss and improves efficiency. The MP3302 monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The MP3302 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP3302 is available in small 8-pin QFN (2mm x 3mm) package. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage V IN 3.3 – 6 V Number of LEDs 27
FEATURES
- 3.3V to 6V Input Voltage Range
- Drives up to 27 White LEDs
- Up to 87% Efficiency
- Open Load Shutdown
- Fully Assembled and Tested
APPLICATIONS
- Cell Phones
- Handheld Computers and PDAs
- Digital Still Cameras
- Small LCD Displays “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV3302DG-00A EVALUATION BOARD 4.6cm x 4.6cm x 1.0cm Board Number MPS IC Number EV3302DG-00A MP3302DG 95% 90% 85% 80% 75% 70% EFFICIENCY (%) 3456 INPUT VOLTAGE(V) Efficiency vs VIN
EV3302DG-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER EV3302DG-00A Rev. 1.1 www.MonolithicPower.com 2 10/18/2007 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC MP3302 SWIN FB GND EN VIN Bias EN GND JP1 LED+ LED-4 EV3302DG-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number 2 C1,C2 4.7µF Ceramic Capacitor, 16V, X5R 0805 Murata GRM21BR61C475KA88
1 C3 NS Not Stuffed
1 C4 0.47µF Ceramic Capacitor, 25V, X7R 0805 Murata GRM21BR71E474KA01L
1 D1 Diode Schottky, 30V, 1A SMA Diodes Inc DFLS130L-F
1 L1 4.7µH Inductor SMD Cooper SD10-4R7-R
10 LED1 to
1 R1 1.10 Ω Resistor, 1% 0805 Yageo R0805FR-071R1L
1 R2 NS Not Stuffed
1 U1 White Led Driver QFN8 MPS MP3302DG
1 CN1 Connector JST SM02B-BHSS-1-TB
EV3302DG-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV3302DG-00A Rev. 1.1 www.MonolithicPower.com 4 10/18/2007 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. QUICK START GUIDE 1. Connect the positive and negative terminals of the load panel (3 white LEDs in series, 9 stings paralleled, each string have a 43ohm droop resistor) to the LED+ and LED- pins on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (3.3V ~ 6V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN pin high (1.5V < Ven < Vin) to enable the MP3302. 4. Apply a DC voltage of 0.7V to 1.4V on EN pin for analog dimming. Maximum brightness (180mA typical) occurs with 1.4V voltage applied. 5. For PWM dimming mode, apply a PWM rectangular waveform with a minimum voltage less than 0.5V and a maximum greater than 1.5V on EN pin. The frequency of the PWM signal is recommended between 100Hz to 10kHz.