EVQ3386-R-00A MPS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 6
Technical content
EVQ3386-R-00A Rev.1.0 www.MonolithicPower.com 1 3/23/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The EVQ3386-R-00A is an evaluation board for the MPQ3386-R, a step-up converter designed for large liquid-crystal displays that employ an array of LEDs as the light source. It can drive up to 6 strings in parallel and 10 LEDs per string. The MPQ3386 uses internal switch current mode, fixed frequency architecture and includes current ballast in each string terminal, which achieves 3% current regulation accuracy between strings. Low feedback voltage at each LED string help reduce power loss and improve efficiency. The MPQ3386 has multiple features to protect the converter from fault conditions, including under-voltage lockout, current limiting, over voltage, short LED, open LED and thermal shut-down protection. The MPQ3386 is available in small QFN24 (4mmx 4mm) package. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage VIN 4.5 – 25 V LEDs # 6 string parallel and
10 LEDs each string
LED Current I LED 20/string mA
FEATURES
- 4.5V to 25V Input Voltage Range
- Up to 89% Efficiency
- Programmable Over Voltage Protection
- Drives up to 6 Strings Parallel and 10 LEDs in Series.
- 3% Current Regulation Accuracy Between Strings
- Selectable Switching Frequency: 1.25MHz and 625kHz
- Open and Short LED Load Protection
- Thermal Shutdown
APPLICATIONS
- Notebook PC
- Automotive and Industrial
- Small LCD TV
- Handy Terminals Display
- Automotive Systems and Tablet Computer All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. EVQ3386-R-00A EVALUATION BOARD (L x W x H) 7.3cm x 2.0cm x 1.0cm Board Number MPS IC Numbe r EVQ3386-R-00A MPQ3386-R
EVQ3386-R- 00A ― 6 STRING WHITE LED DRIVER EVQ3386-R-00A Rev.1.0 www.MonolithicPower.com 2 3/23/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. EVALUATION BOARD SCHEMATIC
EVQ3386-R- 00A ― 6 STRING WHITE LED DRIVER EVQ3386-R-00A Rev.1.0 www.MonolithicPower.com 3 3/23/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. EVQ3386-R-00A BILL OF MATERIALS Qty Re f Value Description Package Manufacture r Part Numbe r 1 C1 4.7µF Ceramic Capacitor, 50V, X7R 1210 Murata GRM32ER71H475KA88L
2 C2, C4 NC 1210
1 C3 2.2µF Ceramic Capacitor, 50V, X7R 1210 TDK C3225X7R1H225
1 C5 68nF Ceramic Capacitor, 50V, X7R 0603 Murata GRM188R71H683KA93D
1 C6 1µF Ceramic Capacitor, 16V, X5R 0603 Murata GRM188R71C105KA12D
2 C7,
C10 100pF Ceramic Capacitor, 50V, COG 0603 Murata GRM1885C1H101JA01D
2 C8, C9 NC 0603
1 D1 Diode Schottky, 60V, 1A SMA Diodes Inc DFLS160-F
1 F1 Fuse, 2A, 63V 1206 Cooper
1 L1 10µH Inductor,2.5A SMD SUMIDA CDRH8D28NP-100NC 10µH Inductor,2.47A SMD Cooper DR73-100
1 M1 P- channel MOSFET SO8 Fairchild
1 R1 324k Ω Resistor, 1% 0603 Yageo RC0603FR-07324KL
1 R2 10k Ω Resistor, 1% 0603 Yageo RC0603FR-0710KL
2 R3, R5 20k Ω Resistor, 5% 0603 Yageo RC0603JR-0720KL
1 R4 NC 0603
1 R6 60.4k Ω Resistor, 1% 0603 Yageo RC0603FR-0760K4L
1 R7 100k Ω Resistor, 1% 0603 Yageo RC0603FR-07100KL
1 U1 LED Driver IC QFN24 MPS MPQ3386-R
EVQ3386-R- 00A ― 6 STRING WHITE LED DRIVER EVQ3386-R-00A Rev.1.0 www.MonolithicPower.com 4 3/23/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN =12V, 10 LEDs in series, 6 strings parallel, 20mA/string, unless otherwise noted. INPUT VOLTAGE (V) EFFICIENCY(%) Efficiency vs. Input Voltage Steady State Vsw 20V/div Vsw 20V/div VIN 5V/div VOUT 20V/div VOUT 20V/divILED 100mA/div Vsw 20V/div VLED6 20V/div VOUT 20V/div ILED 100mA/div ILED 100mA/div Vsw 20V/div VEN 5V/div VOUT 20V/div ILED 100mA/div Vsw 20V/div VPWMI 2V/div VOUT 20V/div ILED 100mA/div Vsw 20V/div VFAULT 5V/div VOUT 20V/div ILED 100mA/div Vsw 20V/div VFAULT 10V/div VOUT 20V/div ILED 100mA/div 1us/div 1ms/div 1ms/div 2ms/div 200us/div 10ms/div 20ms/div Vin Startup Ven Startup PWM Dimming fPWM=2kHz, DPWM=50% Open LED Protection open all LED strings at working Short LED Protecton short Vout to LEDx at working Short LED Protection short Vout to GND at working 41 0 1 6 2 2 2 8
EVQ3386-R- 00A ― 6 STRING WHITE LED DRIVER 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. EVQ3386-R-00A Rev.1.0 www.MonolithicPower.com 6 3/23/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. QUICK START GUIDE 1. Connect the positive and negative terminals of the load panel (10 white LEDs in series, 6 stings paralleled) to the LED+ and LED1~6 pins on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (4.5V ~ 25V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN pin high (2.5V < V EN < 5V) to enable the MPQ3386. 4. For PWM dimming, apply a PWM rectangular waveform with a minimum voltage less than 0.8V and a maximum greater than 1.5V on PWM DIM pin. The frequency of the PWM signal is recommended between 200Hz to 2kHz.