EV3373-M-00A MPS | Alldatasheet
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Technical content
8 Strings, Step Up WLED Controller
EV3373-M-00A Rev.1.0 www.MonolithicPower.com 1 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. The Future of Analog IC Technology
DESCRIPTION
The MP3373 is a step-up controller with 8- channel external current sources designed for driving the WLED arrays for large size LCD panel backlighting applications. The MP3373 employs peak current mode, fixed frequency architecture to provide robust operation with 9V to 40V input supply. The switching frequency is programmable by an external frequency setting resistor. The MP3373 integrates the constant current control circuit to regulate each LED string current to the programmed value set by an external resistor. And the current matching can achieve 1.2% regulation accuracy between strings. Its low 200mV regulation voltage on LED current sources reduces power loss and improves efficiency. To reduce inrush current and the stress of components, MP3373 employs the phase shift PWM dimming mode which can be disabled by pulling PSEN pin to GND. MP3373 also includes UVLO, LED short/open protection, inductor/diode short protection and thermal shut down protection. All fault status is indicated by fault flag signal. The MP3373 is flexible for extending LED channels with two or three ICs in parallel with sharing one power stage. It is available in TSSOP28 and SOIC28 packages. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input Voltage VIN 9 – 28 V LEDs # 8 LED string
10 LEDs/string
LED Current I LED 200/string mA
FEATURES
- 9V to 40V Input Voltage Range
- 8-Channel LED strings with external current balance
- 1.2% Current Matching Accuracy Between Strings
- Programmable Switching Frequency
- External PWM Dimming
- Selectable Phase Shift Function at PWM DIM Mode
- Open/Short LED Protection
- Short Inductor/Diode Protection
- Programmable Over-voltage Protection
- Thermal Shutdown
- Fault Flag Output
- Extendable LED Channels with Share One Set of Power Stage
- TSSOP-28 and SOIC-28 Packages
APPLICATIONS
- LCD Flat Panel Displays
- 2D/3D LCD TVs and Monitors 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.
EV3373-M-00A, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR EV3373-M-00A Rev.1.0 www.MonolithicPower.com 2 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. EV3373-M-00A EVALUATION BOARD (L x W x H) 13.1cm x 8.7cm x 1.6cm Board Number MPS IC Numbe r EV3373-M-00A MP3373 EVALUATION BOARD SCHEMATIC
EV3373-M-00A, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR EV3373-M-00A Rev.1.0 www.MonolithicPower.com 3 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. EV3373A-S-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number
1 C1 220uF Electrolytic Capacitor,
50V DIP Rubycon 50YXF220MEFC 1 C2 4.7µF Ceramic Capacitor, 50V, X7R 1210 Murata GRM32ER71H47 5KA88L
1 C3 NC 1210
2 C4,C5 2.2µF Ceramic Capacitor, 100V, X7R 1210 Murata GRM32ER72A22 5KA35L
1 C7 470uF Electrolytic Capacitor,
100V DIP 江海 CD263-100V470
10 C8,C9,
C13~ C20 NC 0603
1 C10 100pF Ceramic Capacitor,
50V, COG 0603 Murata GRM1885C1H101 JA01 1 C11 0.47uF Ceramic Capacitor, 25V, X7R 0603 Murata GRM188R71EH4 74LKA12
1 C12 1uF Ceramic Capacitor,
25V, X7R 0603 Murata GRM188R71E105 KA12
1 C6 470pF Ceramic Capacitor,
50V, COG 0603 Murata GRM1885C1H471 JA01
2 D1,D2 Diode Schottky, 60V,
1 F1 0 Ω Fuse, 4A, 63V 1206 Cooper
1 L1 47µH Inductor,6.8A SMD Wurth 74435574700
1 M1 N- channel MOSFET TO-263 Analog
8 Q1-Q8 PNP, Transistor,-
100V,-5A SOT223 Zetex FZT953TA
1 R2 357k Ω Resistor, 1% 0603 Yageo RC0603FR-
2 R1,R10 NC 0603
R3,R4,R6,R9,R 12,R16,R21,R2 5,R30,R33,R36 0Ω Resistor, 1% 0603 Yageo RC0603JR-070RL
1 R8 10k Ω Resistor, 1% 0603 Yageo RC0603FR-
1 R11 300 Ω Resistor, 1% 0603 Yageo RC0603FR-
1 R13 0.05 Ω Current Resistor, 1% 2512 CYNTEC RL3264-6-R050- FN 1 R14 0.1 Ω Current Resistor, 1% 2512 CYNTEC RL3264-6-R100- FN R15,R20,R24, R29,R32,R35, R38,R40 1Ω Resistor, 1% 1206 Yageo RC1206FR- 071RL
EV3373-M-00A, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR EV3373-M-00A Rev.1.0 www.MonolithicPower.com 4 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. EV3373A-S-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer Part Number R7,R17,R22,R 26,R31,R34,R3 7,R39,R41 10Ω Resistor, 1% 0603 Yageo RC0603FR- 0710RL
1 R18 100k Ω Resistor, 1% 0603 Yageo RC0603FR-
2 R19,R27 2k Ω Resistor, 1% 0603 Yageo RC0603FR-072KL
3 R5,R23,R28 20k Ω Resistor, 1% 0603 Yageo RC0603FR-
1 U1 LED Driver IC TSSOP28 MPS MP3373GM
EV3373-M-00A, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR EV3373-M-00A Rev.1.0 www.MonolithicPower.com 5 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 18V, 10 LEDs in series, 8 strings parallel, 200mA/string, TA = 25°C, unless otherwise noted.
EV3373-M-00A, 8 STRINGS, WLED CONTROLLER WITH EXTERNAL TRANSISTOR NOTICE: The information in this document is subject to change without notice. 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. EV3373-M-00A Rev.1.0 www.MonolithicPower.com 7 7/11/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. QUICK START GUIDE 1. Connect the positive and negative terminals of the load panel (10 white LEDs in series, 8 stings) to the LED+ and LED-1~8 pins (external PNP’s Emitter) on the EV board, respectively. 2. Connect the positive and negative terminals of the power supply (9V ~ 28V) to the VIN and GND pins on the EV board, respectively. 3. Drive EN pin high (5V) to enable the MP3373. 4. For PWM dimming, apply a PWM rectangular waveform with a minimum voltage less than 0.3V and a maximum greater than 1.6V on EN/PWM pin or DIM pin ( if using EN/PWM pin, need pull DIM pin to high level). The frequency of the PWM signal is recommended between 200Hz to 2kHz. 5. For analog dimming, apply a DC waveform with a voltage between 0.4 and 1.5V on DIM pin.