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| TM EV1528DQ-00A 9 Lamp, 20mA Preciscion WLED Driver Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION The EV1528DQ-00A evaluation board is designed for driving up to nine (9) 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 R1. The MP1528 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 0.4 power switch minimize power loss to improve efficiency. Either a DC voltage or a PWM signal at the BRT input can control the LED brightness. FEATURES * * * * * * * * * * 2.7V to 5.5V Input Voltage Range Drives up to 9 Series White LEDs Analog and Digital PWM Brightness Control Through BRT Surface-Mount Components Fully Assembled and Tested Handheld Computers PDAs PDA Phones Digital and Video Cameras Small LCD Displays APPLICATIONS "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage # of WLEDs LED Current Symbol VIN ILED Value 2.7 - 5.5 7-9 20 Units V mA EV1528DQ-00A EVALUATION BOARD Efficiency vs Load Current 90 80 VIN= 5V 4.2V 3.6V 3V EFFICIENCY (%) 70 60 50 (L x W x H) 2.0" x 1.5" x 0.5" (5.0cm x 3.8cm x 1.4cm) Board Number EV1528DQ-00A MPS IC Number MP1528DQ 40 0 5 10 15 20 LED CURRENT (mA) 25 MP1528_EC01 EV1528DQ-00A Rev. 1.0 10/11/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV1528DQ-00A - 9 LAMP, 20MA PRECISION WLED DRIVER EV BOARD EVALUATION BOARD SCHEMATIC D1 B160B-13-F VIN GND LED1 6 U1 BRT FB BRT GND EN 1 5 MP1528 EN GND C3 10nF 2 4 BIAS SW 3 LED9 EV1528_S01 EV1528DQ-00A BILL OF MATERIALS Qty 1 1 1 1 1 9 1 1 1 Ref C1 C2 C3 D1 L1 LED1 to LED9 R1 R2 U1 20 100k 6.2H Value 4.7F 1F 10nF Description Ceramic Capacitor, 10V, X5R Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 50V, X7R Diode Schottky, 60V, 1A Inductor, 1.45A, D62LCB Not Stuffed Resistor, 1% Resistor, 5% White LED Driver 0805 0805 QFN6 Panasonic: ERJ-6GEYJ200V Panasonic: ERJ-6GEYJ104V MPS: MP1528DQ Digikey: P20ACT-ND Digikey: P100KACT-ND Package 1206 1206 0805 SMA SMD Manufacturer P/N TDK: C3216X5R1A475K TDK: C3216X7R1H105K TDK: C2012X7R1H103K Diodes Inc.: B160B-13-F Toko: A918CY-6R2M Distributor P/N Digikey: 445-1386-1-ND Digikey: 445-1423-1-ND Digikey: 445-1348-1-ND Digikey: B160B-FDICT-ND EV1528DQ-00A Rev. 1.0 10/11/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV1528DQ-00A - 9 LAMP, 20MA PRECISION WLED DRIVER EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer QUICK START GUIDE 1. Solder LED1 - LED9 to the board. 2. Attach the positive and negative terminals of the power supply (2.7V - 5.5V) to the VIN and GND pins, respectively. 3. Drive EN high to enable the MP1528. 4. Apply a DC voltage of 0.3V to 1.2V on BRT for analog dimming. Maximum brightness (20mA typical) occurs with 1.2V applied. For PWM dimming mode, apply a PWM rectangular wave with a minimum voltage less than 0.18V and a maximum greater than 1.2V. When a voltage less than 0.18V is applied to this pin, the output switch is turned off. The frequency of the PWM signal must be between 100Hz to 400Hz. 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. EV1528DQ-00A Rev. 1.0 10/11/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 |
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