EV0035 MPS | Alldatasheet
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Technical content
6 White LEDs, 20mA Precision
WLED Driver Evaluation Board EV0035 Rev. 1.2 www.MonolithicPower.com 1 3/30/2006 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. The Future of Analog IC Technology TM TM
DESCRIPTION
The EV0035 is the evaluation board for the MP1523, which is designed for driving up to six (6) series WLEDs from a single cell Lithium Ion battery. The board is set up to obtain 20mA LED current. The current can be adjusted by varying the resistor R2. The MP1523 uses current limited, variable frequency architecture to regulate the LED current while maintaining high efficiency. The BIAS pin measures the output voltage and turns off the converter if an over voltage condition is present to prevent damage due to an open circuit condition. The LED current is measured with an external current sense resistor. The low 0.4V full-scale regulation threshold and 0.5 Ω power switch minimize power loss to improve efficiency. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage V IN 2.7 – 25 V # of WLEDs up to 6 LED Current I LED 20 mA
FEATURES
- 2.7V to 25V Input Voltage Range
- Drives up to 6 Series White LEDs
- Surface-Mount Components
- Fully Assembled and Tested
APPLICATIONS
- Cell Phones
- Handheld Computers and PDAs
- Digital Still and Video Cameras
- Small LCD Displays “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. EV0035 EVALUATION BOARD (5.0cm x 3.5 x 1.2cm) Board Number MPS IC Number EV0035 MP1523DT
70 EFFICIENCY (%)
VIN (V) EV0035_AC01 Efficiency vs VIN
EV0035 – 6 WHITE LEDs, 20mA PRECISION WLED DRIVER EVALUATION BOARD EV0035 Rev. 1.2 www.MonolithicPower.com 2 3/30/2006 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM EVALUATION BOARD SCHEMATIC EV0035_S01 MP1523 EN GND SW BIAS FB LED1 LED2 LED3 LED4 LED5 LED6 MBR0540 VCC GND EN GND C3 10nF EV0035 BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number 2 C1, C2 1µF Ceramic Cap., 50V, X7R 1206 TDK C3216X7R1H105K 1 C3 10nF Ceramic Cap., 50V, X7R 0603 TDK C1608X7R1H103K
1 D1 Diode Schottky, 40V, 500mA SOD-123 ON
6 LED1 to
1 L1 15µH Inductor, 450mA SMD Sumida CDRH3D16-150NC
1 R1 100k Ω Film Res., 5% 0603 Panasonic ERJ-3GEYJ104V 1 R2 20 Ω Film Res., 5% 0603 Panasonic ERJ-3GEYJ200V
1 U1 White LED Driver SOT23-5 MPS MP1523DT
EV0035 – 6 WHITE LEDs, 20mA PRECISION WLED 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. EV0035 Rev. 1.2 www.MonolithicPower.com 4 3/30/2006 MPS Proprietary Information. Unaut horized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM QUICK START GUIDE 1. Solder LED1 – LED6 onto the board. 2. Connect VCC to the power source’s positive output. 3. Connect GND to supply ground. 4. Remove the jumper J1 to allow the MP1523 to automatically start when power is applied. Place the shorting clip across J1 to disable the MP1523. A logic signal may be applied to EN to enable/disable the MP1523, provided the shorting clip is not installed across J1. 5. To dim the LEDs, remove the shorting clip from J1 and apply a PWM signal to the EN pin. Adjusting the duty cycle of the PWM signal determines the brightness of the LEDs.