DEMO MANUAL DC2297A LT8570, LT8570-1 Boost/SEPIC/Inverting Regulator DESCRIPTION Demonstration circuits 2297A-A and 2297A-B feature the LT®8570 and LT8570-1 in a boost configuration. These demo circuits demonstrate small size and low component count. Both converters are designed to convert a 5V to 10V source to 12V. Refer to Figures 3 and 4 for maximum load current at different input voltage levels. Both converters use only one feedback resistor to set the output voltage. The LT8570 can operate with inputs as high as 40V but in these demo circuits, the input is limited by the voltage rating of the input capacitors, and the magnitude of the output voltage. PERFORMANCE SUMMARY SYMBOL PARAMETER The LT8570 and LT8570-1 include many other features such as synchronization to external clock, user configurable undervoltage lockout, soft-start, frequency foldback, and other features that are easily configured as Boost, SEPIC or Inverting Converters. The data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2297A. Design files for this circuit board are available at http://www.linear.com/demo/DC2297A L, LT, LTC, LTM, µModule, 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 MIN VIN = 5V, ILOAD = 125mA 11.64 TYP MAX UNITS 10 V 12 12.36 V DC2297A-A VIN Input Supply Range VOUT Output Voltage 5 RIPPLE VIN = 5V, ILOAD = 125mA EFFICIENCY VIN = 5V, ILOAD = 125mA 25 SWITCHING FREQUENCY mV 86 % 1.5 MHz DC2297A-B VIN Input Supply Range VOUT Output Voltage 5 VIN = 5V, ILOAD = 60mA 11.64 12 10 V 12.36 V RIPPLE VIN = 5V, ILOAD = 60mA 5 mV EFFICIENCY VIN = 5V, ILOAD = 60mA 86 % 1.5 MHz SWITCHING FREQUENCY dc2297afa 1 DEMO MANUAL DC2297A QUICK START PROCEDURE Demo circuit 2297A is easy to set up to evaluate the performance of the LT8570 and LT8570-1. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE: When measuring the input or output voltage ripple, 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 or VOUT and GND terminals. See Figure 2 for proper scope probe technique. 1. With power off, connect the input power supply to VIN and GND. – POWER SUPPLY – + IIN 2. Turn on the power at the input. NOTE: Make sure that the input voltage does not exceed 10V. 3. Check for the proper output voltage. NOTE: 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 voltages are established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. + – + – – VIN + LOAD VOUT + + – IOUT Figure 1. Proper Measurement Equipment Setup GND VIN Figure 2. Measuring Input or Output Ripple 2 dc2297afa DEMO MANUAL DC2297A QUICK START PROCEDURE 450 90 400 85 350 80 EFFICIENCY (%) LOAD (mA) 300 250 200 150 75 70 65 60 100 55 50 0 3 4 5 6 7 INPUT (V) 8 9 50 10 0 20 40 80 60 INPUT (V) 100 DC2297A F03 Figure 3. DC2297A-A Max Load Current vs Input Voltage Figure 5. DC2297A-A Efficiency at 5VIN 90 220 85 200 180 80 EFFICIENCY (%) 160 LOAD (mA) 140 DC2297A F05 240 140 120 100 80 75 70 65 60 60 40 55 20 0 120 3 4 5 6 7 INPUT (V) 8 9 10 DC2297A F04 Figure 4. DC2297A-B Max Load Current vs Input Voltage 50 0 10 20 30 40 INPUT (V) 50 60 DC2297A F06 Figure 6. DC2297A-B Efficiency at 5VIN dc2297afa 3 DEMO MANUAL DC2297A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2297A-A Required Circuit Components for Boost Regulator 1 1 C1 CAP., CER., 4.7µF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C475KA73L 2 1 C2 CAP., CER., 0.1µF, X7R, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D 3 1 C3 CAP., CER., 2.2nF, X7R, 16V, 10%, 0402 AVX, 0402YC222KAT2A 4 1 C4 CAP., CER., 47pF, C0G, 25V, 5%, 0402 AVX, 04023A470JAT2A 5 1 C6 CAP., CER., 4.7µF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C475KA73L 6 1 D1 DIODE, SCHOTTKY, 30V, 1A, DI123 DIODES INC., DFLS130-7 7 1 L1 IND., 33µH WÜRTH ELEKTRONIK, 744 042 330 8 1 R2 RES., 11.3k, 1/8W, 1%, 0805 VISHAY, CRCW080511K3FKEA 9 1 R3 RES., 10k, 1/8W, 1%, 0805 VISHAY, CRCW080510K0FKEA 10 1 R5 RES., 56.2k, 1/10W, 1%, 0603 VISHAY, CRCW060356K2FKEA 11 1 R6 RES., 6.04k, 1/10W, 1%, 0603 NIC, NRC06F6041TRF 12 1 R7 RES., 130k, 1/10W, 1%, 0603 VISHAY, CRCW0603130KFKEA 13 1 U1 I.C., LT8570EDD, 8DFN LINEAR TECH., LT8570EDD#PBF Additional Demo Board Circuit Components 1 1 C5 CAP., CER., 0.1µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C104K 2 1 R4 RES., 100k, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA TEST POINT, TURRET, 0.094" MTG HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 Hardware: For Demo Board Only 1 6 E1–E6 DC2297A-B Required Circuit Components for Boost Regulator 1 1 C1 CAP., CER., 4.7µF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C475KA73L 2 1 C2 CAP., CER., 0.1µF, X7R, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D 3 1 C3 CAP., CER., 2.2nF, X7R, 16V, 10%, 0402 AVX, 0402YC222KAT2A 4 1 C4 CAP., CER., 47pF, C0G, 25V, 5%, 0402 AVX, 04023A470JAT2A 5 1 C6 CAP., CER., 2.2µF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C225KA12L 6 1 D1 DIODE, SCHOTTKY, 30V, 1A, DI123 DIODES INC., DFLS130-7 7 1 L1 IND., 68µH U ELEKTRONIK, 744 042 680 8 1 R2 RES., 11.3k, 1/8W, 1%, 0805 VISHAY, CRCW080511K3FKEA 9 1 R3 RES., 10k, 1/8W, 1%, 0805 VISHAY, CRCW080510K0FKEA 10 1 R5 RES., 56.2k, 1/10W, 1%, 0603 VISHAY, CRCW060356K2FKEA 11 1 R6 RES., 6.04k, 1/10W, 1%, 0603 NIC, NRC06F6041TRF 12 1 R7 RES., 130k, 1/10W, 1%, 0603 VISHAY, CRCW0603130KFKEA 13 1 U1 I.C., LT8570EDD-1, 8DFN LINEAR TECH., LT8570EDD-1#PBF Additional Demo Board Circuit Components 1 1 C5 CAP., CER., 0.1µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C104K 2 1 R4 RES., 100k, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA TEST POINT, TURRET, 0.094" MTG HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 Hardware: For Demo Board Only 1 4 6 E–E6 dc2297afa DEMO MANUAL DC2297A SCHEMATIC DIAGRAM VIN 5V TO 10V E1 3 4 VIN SW SHDN FB VC SYNC SYNC 8 E6 R4 100k 0805 SS 7 RT 6 C2 0.1µF GND 9 R6 56.2k 0603 VOUT* R7 130k 0603 U1* R3 10k 0805 SYNC GND 5 SHDN E2 E4 C1 4.7µF 16V 0805 R2 11.3k 0805 SHDN D1 DFLS130 L1* 1 C6* 16V 0805 2 R6 6.19k 0603 C5 0.1µF 16V 0603 C4 47pF C3 2.2nF E3 E5 GND * VERSION TABLE ASSEMBLY TYPE C6 L1 VOUT DC2297A-A LT8570EDD U1 4.7µF 33µF 12V/125mA DC2297A-B LT8570-1EDD 2.2µF 66µH 12V/60mA dc2297afa 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. 5 DEMO MANUAL DC2297A 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 dc2297afa Linear Technology Corporation LT 0315 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015