LX7309EVB V to 48V Boost 15W Evaluation Board LX7309EVB-201 EVALUATION BOARD USER GUIDE. Page 1
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1 LX7309EVB-20 LX7309EVB V to 48V Boost 5W Evaluation Board Copyright 203 Rev..2, Page
2 LX7309EVB-20 CONTENTS INTRODUCTION TO PRODUCT... 3 FEATURES:... 3 INPUT AND OUTPUT CONNECTION POINTS... 3 LX7309EVB-20 EVALUATION BOARD BOM... 4 LX7309EVB-20 EVALUATION BOARD SCHEMATIC... 6 TEST DATA... 7 PCB SILKSCREEN AND PCB LAYOUT... 2 Copyright 203 Rev..2, Page 2
3 LX7309EVB-20 Introduction to Product The LX7309EVB-20 is a 2V to 48V Boost Evaluation Board capable of handling 5W of power. It is based on the LX7309 current mode DC-DC controller. The design features an isolated secondary side from primary side. The evaluation board is designed for output current up to 48V. Features: 2V to 48V Boost converter with 5W of output power Isolated secondary side 0.8V to 3.2V Input range The Evaluation board is configured to operate at 200kHz switching frequency Input and Output Connection Points Test Point J Vout RTN Description Input power connector 2V (+2V center, GND outside ring) 48V Output Output ground Copyright 203 Rev..2, Page 3
4 LX7309EVB-20 LX7309EVB-20 Evaluation Board BOM Item Number Quantity Part Reference Part Value Description Manufacturer Manufacturer Part Number 2 C,C2 22uF CAP CER 22UF 20% X7R 20 TAIYOYUDEN TMK325B7226MM-TR 2 4 C3,C5,C9,C 00n CAP CER 0.UF 0% X7R 0603 TDK C608X7RE04K080AA 3 3 C 5nF CAP CER 5nF 6V 0% X7R 0603 Any Any 4 C4 47nF CAP CER 0.047UF 0% X7R 0805 TDK CGJ4J2X7RE473K25AA 5 C6 00uF CAP ALUM 00UF 00V 20% RADIAL Nichicon UPW2A0MHD 6 C7 uf CAP CER UF 0% X7R 0805 TDK C202X7RE05K25AB 7 C8 uf Capacitor, Ceramic, uf 6V, 20%, X5R, 0603 Any Any 8 C0.0uF CAP CER 0UF 0V 0% X7R 0805 TDK C202X7RA06K25AC 9 C4 4.7nF Capacitor, Ceramic, X7R, 0V, 0603 Any Any 0 C5 00nF CAP CER 0.UF 0% X7R 0603 TDK C608X7RE04K080AA D SS200 DIODE SCHOTTKY 200V A SMA Micro Commercial Co SS200-LTP 2 D2 ESA DIODE FAST REC A 50V DO24AC Micro Commercial Co ESA-TP 3 D3 2V DIODE ZENER 2V 50MW EMD2 Rohm Semiconductor EDZTE62B 4 D6 NC DIODE GEN PURPOSE 50V A DO24AC Micro Commercial Co GSA-LTP 5 J RAPC722X DC Power Jack 6V 5A TH Switchcraft RAPC722X 6 Q FDS6690 MOSFET N-CH 30V A 8-SOIC Fairchild FDS R 249 RES 249 OHM W % 252 SMD Vishay CRCW252249RFKEG 8 R2 0 Resistor, 5%, /0W, 0603 Any Any 9 2 R3a,R3b 5k Resistor, 5%, /4W, 0805 Panasonic ERJ-P06J752V 20 R4 0 Resistor, 5%, /0W, 0603 Any Any 2 R5 2.4K Resistor, 5%, /0W, 0603 Any Any 22 R6.6K Resistor, 5%, /0W, 0603 Any Any 23 R7 0K Resistor, 5%, /0W, 0603 Any Any Copyright 203 Rev..2, Page 4
5 LX7309EVB-20 Item Number Quantity Part Reference Part Value Description Manufacturer Manufacturer Part Number 24 R RES.043 OHM /2W % 0805 SMD Panasonic ERJ-6BWFR043V 25 R9.2K Resistor, 5%, /0W, 0603 Any Any 26 R0 93.k Resistor, %,/8W,0805 Any Any 27 R 00k Resistor, 5%, /0W, 0603 Any Any 28 R2 374K Resistor, %,/6W,0603 Any Any 30 R4 4.99K Resistor, %,/6W,0603 Any Any 3 R5 9.k Resistor, %,/6W,0603 Any Any 32 R6 470K Resistor, 5%, /0W, 0603 Any Any 33 R7 49.9K Resistor, %,/6W,0603 Any Any 34 R8 2.49K Resistor, %,/6W,0603 Any Any 35 R9 00 Resistor, 5%, /0W, 0603 Any Any 36 T Transforme Transformer; Flyback, EFD20 Core TMP Custom r 37 U IC, PWM Controller, 24 pin 4mm x 4mm QFN LX7309ILQ LX U2 FOD87C OPTOCOUPLER PHOTOTRANS OUT 4-SMD Fairchild Semiconductor FOD87CSD 39 U3 IC VREF SHUNT PREC ADJ SOT-23-3 Texas Instruments TL43AIDBZR TL43 Copyright 203 Rev..2, Page 5
6 SYNC VINS_SEL RFRQ SS RCLP VSN 3 CSP CSP LX7309EVB-20 LX7309EVB-20 Evaluation Board Schematic J 2 3 VIN+ 0.8V TO 3.2V INPUT RAPC722X D6 2 NC OPTIONAL REVERSE-POLARITY PROTECTION C 22uF C2 22uF C3 00n R2 0 R 249 W D2 ESA C4 47nF 2 T D 2 SS200 + C6 00uF 00V C5 00n 00V VOUT RTN 0.32 AMP PG C7 uf R3a 5k /4W R3b 5k /4W VDD VIN+ R5 9.k C9 00n R2 374K PAD VH VCC EN VINS NC NC 24 HYST EP PG 23 CSN 2 U LX7309 PGND 20 SG 9 VDD 8 GND 7 FB 6 DAO 5 COMP VSP C3 00n 4 3 VDD C0.0uF 0V VDD R4 0 Q FDS6690 R7 0K CSPFLT R /2W VDD C5 00n R9.2K 4 3 U2 2 FOD87C R5 2.4k D3 2V U3 C8 uf 6V 2 R TL43 00k R6.6K C 5nF R0 93.k R4 4.99K R8 2.49K R6 470K PG R7 49.9K CSP R9 00 CSPFLT C4 4.7nF VDD PRIMARY SECONDARY Copyright 203 Rev..2, Schematic 2V to 48V 5W Boost Circuit Page 6
7 LX7309EVB-20 Test Data 00% 90% 80% 70% 60% 50% 40% 30% 20% 0% 0% Efficiency Output Current (A) Efficiency Calculation Pout Vin (V) Iin (A) (W) Pin (W) Efficiency % % % % % Copyright 203 Rev..2, Page 7
8 LX7309EVB-20 Load Regulation.0% 0.5% 0.0% -0.5% -.0% Output Current (A) Load Regulation Load Current (A) Vout (V) Copyright 203 Rev..2, Page 8
9 LX7309EVB-20 Bode Plot Full load with VIN = 2V Phase Margin = 53 Copyright 203 Rev..2, Page 9
10 LX7309EVB-20 Output Ripple Full Load Copyright 203 Rev..2, Page 0
11 LX7309EVB-20 Start Up Full Load Copyright 203 Rev..2, Page
12 R5 R6 R7 R3 R5 R2 C9 R9 R5 C0 R2 C7 R4 R0 R3 D4 R8 + C5 D2 C C2 C3 R C4 C2 LX7309EVB-20 PCB Silkscreen and PCB Layout D6 T C6 RTN D 2 3 J + R7 R4 R9 C4 U Q U2 U3 R6 R C C8 D3 D5 VOUT R8 C3 ANALOG MIXED SIGNAL GROUP 5W 2V TO 48V ISOLATED DC-DC CONVERTER LX7309EVB-20 PCB SILKSCREEN PCB Layout Top Layer PCB Dimensions (L x W): 3.50 x 2.00 (88.9mm x 50.8mm) Copyright 203 Rev..2, Page 2
13 LX7309EVB-20 SGE3293 X PCB Layout Bottom Layer Copyright 203 Rev..2, Page 3
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