DEMO MANUAL DC2240A LT8714 Synchronous Four-Quadrant Converter Description Demonstration circuit 2240A is a synchronous fourquadrant converter featuring the LT® 8714 switching controller. The LT8714 can regulate to positive, negative, or zero volts when configured as a four-quadrant topology. The DC2240A regulates from a 10V to 14V input source to an adjustable output voltage from positive 5V to negative 5V with a 5A maximum current rating, and operates at 200kHz switching frequency. The LT8714 incorporates a power good feature to let the user know if the output voltage is within its target regulation voltage. The LT8714 has an output voltage control (CTRL) pin which sets the output voltage. The DC2240A has a Performance Summary PARAMETER jumper to select the CTRL pin voltage source from either externally (EXT) or internally (INT). If selected internally, the output voltage can be set to +5V or –5V. If selected externally, the output voltage can vary between positive 5V and negative 5V, following a 0.1V – 1V CTRL signal with high bandwidth. The LT8714 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2240A. Design files for this circuit board are available at http://www.linear.com/8714 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITIONS Input Voltage MIN TYP MAX 10 12 14 UNITS V Positive Output Voltage (Max) VIN = 10V – 14V 4.85 5 5.15 V Negative Output Voltage (Max) VIN = 10V – 14V –4.85 –5 –5.15 V Maximum Output Current 5 A Positive Output Voltage Ripple VIN = 10V – 14V, VOUT = 5V, IOUT = 5A (20MHz BW) 25 mVP-P Negative Output Voltage Ripple VIN = 10V – 14V, VOUT = –5V, IOUT = –5A (20MHz BW) 25 mVP-P Typical Switching Frequency Efficiency 200 kHz VIN = 12V, VOUT = 5V, IOUT = 5A 89 % VIN = 12V, VOUT = –5V, IOUT = –5A 80 % Figure 1. DC2240A Connection Diagram dc2240af 1 DEMO MANUAL DC2240A Quick Start Procedure Demonstration circuit 2240A is easy to set up to evaluate the performance of the LT8714. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. With the power off, connect the input power supply to the board through VIN and PGND terminals. Connect the load to the terminals VOUT and PGND on the board. Make sure that the input power supply has sufficient current rating at minimum input voltage for the required output load. 2. Turn on the power at the input. NOTE: Make sure that the input voltage does not exceed 14V. + + – + VIN – IIN 3. Check for the proper output voltages. The output should be regulated at +5.0V (±3%). If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 4. Once the proper output voltage is established, adjust the input voltage and load current within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. NOTE: When measuring the input or output voltage ripples, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN and PGND, or VOUT and PGND terminals. See Figure 2 for proper scope probe technique. + – IOUT – + POWER SUPPLY – VOUT DC2240A F01 Figure 1. Proper Measurement Equipment Setup 2 dc2240af DEMO MANUAL DC2240A Quick Start Procedure INPUT OR OUTPUT CAPACITOR Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple 100 95 EFFICIENCY (%) 90 85 80 75 70 65 60 55 VIN = 10V, VO = +5V VIN = 12V, VO = +5V VIN = 14V, VO = +5V VIN = 10V, VO = –5V VIN = 12V, VO = –5V VIN = 14V, VO = –5V 50 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT CURRENT (A) DC2240A F03 Figure 3. Typical Efficiency Curve VCTRL 0.5V/DIV VOUT 5V/DIV 500µs/DIV DC2240A F04 Figure 4. Output Voltage Varies Between –5V and +5V, Following an Externally Controlled 0.1V to 1V, 1kHz Sinusoidal Voltage Source dc2240af 3 DEMO MANUAL DC2240A Parts List ITEM QTY REFERENCE Required Circuit Components 1 4 CIN1, CIN2, CIN3, CIN4 2 6 C1, C2, C3, C4, C20, C21 3 2 CO1, CO2 4 3 C7, C8, C9 5 1 C10 6 1 C11 7 1 C12 8 1 C13 9 1 C15 10 1 L1 11 1 L2 12 1 MN1 13 1 MP1 14 1 R1 15 1 R2 16 6 R3, R4, R5, R6, R9, R10 17 1 R7 18 1 R8 19 1 R16 20 1 R19 21 3 R12, R15, R18 22 1 R13 23 1 R14 24 1 R17 25 1 R19 26 1 R20 27 1 R22 28 1 U1 29 1 Additional Demo Board Circuit Components 1 0 CO3, CO4 (OPT) 2 0 C5, C6, C16, C17 (OPT) 3 0 C18 (OPT) 4 0 VR1 (OPT) 5 0 R21 (OPT) 6 0 MN2 (OPT) 7 0 MP2 (OPT) Hardware: For Demo Board Only 1 13 E1-E13 2 3 4 5 4 1 1 2 4 JP1 JP2 XJP1, XJP2 MH1-MH4 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X5R, 22µF, 25V, 10%, 1210 CAP., X5R, 22µF, 25V, 10%, 1210 CAP., X5R, 100µF, 10V, 20%, 1210 CAP., X7R, 2.2µF, 25V, 10%, 0805 CAP., X7R, 0.68µF, 25V, 10%, 0603 CAP., X7R, 0.068µF, 25V, 10%, 0603 CAP., X7R, 0.01µF, 25V, 10%, 0603 CAP., X7R, 100pF, 25V, 10%, 0603 CAP., X7R, 0.1µF, 16V, 10%, 0603 INDUCTOR, 15µH INDUCTOR, 15µH N-CH FET, PG-TDSON-8 P-CH FET, DPAK RES., SENSE, 7 mΩ, 1%, RL3720W RES., SENSE, 2 mΩ, 1%, RL3720W RES., 0Ω, 0.1W, 1%, 0603 RES., 10k, 1/10W, 1%, 0603 RES., 57.6k, 1/10W, 1%, 0603 RES., 6.98k, 1/10W, 1%, 0603 RES., 18.7k, 1/10W, 1%, 0603 RES., 100k, 1/10W, 1%, 0603 RES., 73.2k, 1/10W, 1%, 0603 RES., 100, 1/10W, 1%, 0603 RES., 178k, 1/10W, 1%, 0603 RES., 18.7k, 1/10W, 1%, 0603 RES., 1Ω, 1/4W, 1%, 1206 RES., 1.78k, 1/10W, 1%, 0603 I.C., VOLTAGE REGULATOR, 20TSSOP FAB, PRINTED CIRCUIT BOARD MURATA, GRM32ER61E226KE15L MURATA, GRM32ER61E226KE15L MURATA, GRM32ER61A107ME20K MURATA, GRM21BR71E225KA73L TDK, C1608X7R1E684K080AB MURATA, GRM188R71E683KA01D MURATA, GRM188R71E103KA01D AVX, 06033C101KAT2A MURATA, GRM188R71C104KA01D Coilcraft, XAL1510-153 Coilcraft, XAL1010-153 INFINEON, BSC034N06NS FAIRCHILD, FDD4141 SUSUMU, RL3720WT-R007-F SUSUMU, RL3720WT-R002-F VISHAY, CRCW06030000Z0EA VISHAY, CRCW060310K0FKEA VISHAY, CRCW060357K6FKEA VISHAY, CRCW06036K98FKEA VISHAY, CRCW060318K7FKEA VISHAY, CRCW0603100KFKEA VISHAY, CRCW060373K2FKEA VISHAY, CRCW0603100RFKEA VISHAY, CRCW0603178KFKEA VISHAY, CRCW060318K7FKEA VISHAY, CRCW12061R00FKEA VISHAY, CRCW06031K78FKEA LINEAR TECHNOLOGY, LT8714EFE#PBF DEMO CIRCUIT 2240A CAP., OPTION, 1210 CAP., OPTION, 0603 CAP., OPTION, 0805 TRIMMER, OPT RES., OPT, 0603 N-CH FET, OPTION, DPAK P-CH FET, OPTION, PG-TDSON-8 TESTPOINT, TURRET, .094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0 HEADER 3 PIN 0.079 SINGLE ROW HEADER 3 PIN 0.079 DOUBLE ROW SHUNT, 0.079" CENTER STAND-OFF, NYLON 0.50" WURTH ELEKTRONIK, 620 003 111 21 WURTH ELEKTRONIK, 620 006 211 21 WURTH ELEKTRONIK, 608 002 134 21 KEYSTONE, 8833 (SNAP ON) dc2240af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C E12 E11 E10 E9 E4 E3 E2 IMON SYNC EN VIN CIN1 22µF 25V 1210 CIN2 22µF 25V 1210 CIN3 22µF 25V 1210 CIN4 22µF 25V 1210 E 1. ALL RESISTORS AND CAPACITORS 0603. NOTE: UNLESS OTHERWISE SPECIFIED. AGND IMON SYNC EN PGND VIN 10V - 14V E1 D 2.2µF 0805 C7 R17 178k 1% 2.2µF 0805 C8 10k R7 R18 100k IMON SYNC R12 100k EN C10 680nF INTVCC R8 57.6k R6 0 NG C11 68nF 5 3 19 18 4 12 16 13 11 4 BIAS CTRL FB ISN ISP TG GND 21 20 C VC INTVEE GND U1 LT8714EFE 15 C6 OPT R5 0 CSP IMON SS SYNC RT PG R1 0.002 1% RL3720W NG TG 0.007 RL3720W R2 14 INTVCC EN VIN BG ISN C 0 22uF 1210 25V 22uF 1210 25V C2 C1 MP1 FDD4141 5 C9 2.2µF 0805 73.2k 1% C12 10nF R16 6.98k R9 0 R10 0 VIN C18 OPT 0805 C17 OPT C3 22uF C4 C20 1210 C21 25V R13 C16 OPT TG PG MN2 OPT DPAK C13 100pF 2 9 8 17 1 6 7 10 R3 PG 3 2 1 MP2 OPT PG-TDSON-8 4 ISP CSN R4 0 OPT C5 MN1 BSC034N06NS L1 15uH XAL1510-153 5 1 2 3 D D 1 1206 R20 C15 100nF ISN ISP L2 15uH XAL1010-153 100 B R14 B OPT VR1 3 R21 OPT 0603 1 2 JP1 +5V 4 6 5 JP2 2 3 -5V OPT R19 18.7k 0603 1 CO4 OPT 100k 0603 INT 2 EXT CO3 OPT R15 CO2 100µF 10V 1210 1 R22 1.78k 0603 INTVCC CO1 100µF 10V 1210 3 E A VOUT A E13 PGND VOUT ±5V / 5A VCTRL 0.1V - 1V E8 E7 E6 E5 A B C D DEMO MANUAL DC2240A Schematic Diagram dc2240af 5 DEMO MANUAL DC2240A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 6 dc2240af Linear Technology Corporation LT 1015 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015