DEMO MANUAL DC1882A LTC3261EMSE High Voltage, Low Noise Inverting Charge Pump DESCRIPTION Demonstration circuit 1882A is a high voltage inverting charge pump featuring the LTC®3261EMSE. The LTC3261 operates with an input voltage from 4.5V to 32V. The demo board provides the means to select between Burst Mode® operation or constant-frequency mode operation, plus select an operating frequency of 500kHz, 200kHz, and 50kHz. The LTC3261 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1882A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS VIN Input Voltage VOUT Output Voltage MIN TYP MAX 4.5 MODE = 0V MODE ≥ 2V 32 –VIN –0.94 • VIN UNITS V V V QUICK START PROCEDURE Refer to Figure 1 for the proper measurement equipment setup and jumper settings, 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. Make sure the jumper settings are as follows: JP1: EN is in the ON position. 2. Set PS1 to 15V and turn on supply. 3. Slowly increase the load from 0mA to –100mA and observe the output voltage and output ripple. 4. Set the load to 0mA. 5. Move the MODE jumper, JP2, from the BURST position to the CONT FREQ position and then repeat step 3. 6. Set the load to 0mA. 7. Move the FREQ jumper, JP3, from the 500kHz position to the 200kHz position. JP2: MODE is in the BURST position. 8. Slowly increase the load from 0mA to –50mA and observe the output voltage and output ripple. JP3: FREQ is in the 500kHz position. 9. Set the load to 0mA. dc1882afa 1 DEMO MANUAL DC1882A QUICK START PROCEDURE 10. Move the FREQ jumper, JP3, from the 200kHz position to the 50kHz position. 11. Slowly increase the load from 0mA to –10mA and observe the output voltage and output ripple. 12. Turn off the load and PS1. 13. Set up the load, AM2 and VM2, for the power conversion efficiency measurement, as illustrated in Figure 3. 14. Set the MODE jumper, JP2, to the BURST position and the FREQ jumper, JP3, to the 500kHz position. 15. Set PS1 to 15V and turn on the supply. 16. Set the load to a desired current from 0mA to 100mA. 17. Calculate the power conversion efficiency from the following formula: Efficiency = V L • IL VS • IS • 100% Figures 4 and 5 illustrate how the power conversion efficiency varies with load current in Burst Mode operation and in constant-frequency mode operation. dc1882a F01 Figure 1. Proper Measurement Equipment Setup for DC1882A dc1882a F02 Figure 2. Measuring Input or Output Ripple dc1882afa 2 DEMO MANUAL DC1882A QUICK START PROCEDURE dc1882a F03 Figure 3. Power Conversion Efficiency Measurement Setup 90 VIN = 15V 80 50kHz CF MODE 70 200kHz CF MODE EFFICIENCY (%) 60 500kHz CF MODE 50 40 30 20 10 1 10 IL (mA) 100 dc1882a F04 Figure 4. LTC3261 Constant-Frequency Mode Operation Power Conversion Efficiency dc1882afa 3 DEMO MANUAL DC1882A QUICK START PROCEDURE 90 VIN = 15V fOSC = 500kHz 89 88 EFFICIENCY (%) 87 86 85 84 83 82 81 80 10 1 100 IL (mA) dc1882a F05 Figure 5. LTC3261 Burst Mode Operation Power Conversion Efficiency PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1826A Required Circuit Components 1 2 C2, C4 CAP, CER, 10μF, 50V, X7S, 10%, 1210 TDK, C3225X7S1H106K 2 1 C3 CAP, CER, 1μF, 50V, X7R, 10%, 1206 MURATA, GRM31MR71H105KA88 5 1 U1 LOW NOISE INVERTING CHARGE PUMP LINEAR TECHNOLOGY, LTC3261EMSE#PBF CAP, CER, 4.7μF, 50V, X7R, 10%, 1210 MURATA, GRM32ER71H475KA88L Additional Demo Board Circuit Components 1 1 C1 3 2 R1, R2 RES, 1MΩ, 1/16W, 5%, 0402, SMD VISHAY, CRCW04021M00JNED 4 2 R3 RES, 1MΩ, 1/16W, 1%, 0402, SMD VISHAY, CRCW04021M00FKED 5 1 R4 RES, 200k, 1/10W, 1%, 0402, SMD VISHAY, CRCW0402200KFKED SAMTEC, TMM-103-02-L-S Hardware: For Demo Board Only 1 3 JP1-JP2 HEADER, 3 PIN, 1 ROW, 0.079" 2 1 JP3 HEADER, 4 PIN, 1 ROW, 0.079" SAMTEC, TMM-104-02-L-S 3 3 JP1-JP3 SHUNT, 2mm SAMTEC, 2SN-KB-G 4 4 E1, E2, E6, E7 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0 5 3 E3, E4, E5 TURRET, 0.061", DIA MILL-MAX, 2308-2-00-80-00-00-07-0 dc1882afa 4 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. E5 E4 E3 E2 OFF ON 1K 5% R6 1K 5% R5 JP1 EN C1 4.7uF 50V 1210 1 2 3 R1 1M 5% CONT FREQ JP2 2 3 MODE 1 BURST 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE 0402, 1%, 1/16W NOTE: UNLESS OTHERWISE SPECIFIED GND MODE EN GND 4.5V - 32V VIN E1 11 10 LTC3261EMSE MODE EN C+ CUSTOMER NOTICE C6 OPT 0603 C5 OPT 0603 C2 10uF 50V 1210 VIN 8 13 2 12 7 6 3 1 4 PCB DES. NC SCALE = NONE DATE: N/A SIZE JP3 FREQ 500KHz 200KHz 50KHz TECHNOLOGY 1 2 3 4 VOUT GND ( - VIN ) 100mA 03-12-12 IC NO. LTC3261EMSE DEMO CIRCUIT 1882A SHEET 1 OF 1 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E7 E6 LOW NOISE INVERTING CHARGE PUMP TITLE: SCHEMATIC R4 200K R3 1.0M C4 10uF 50V 1210 Figure 10. LTC3261 Low Noise Inverting Charge Pump THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. RT NC NC NC NC NC VOUT APPROVALS C- 5 APP ENG. MARTY M. GND 50V 1206 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 5% R2 1M 9 U1 C3 1uF DEMO MANUAL DC1882A SCHEMATIC DIAGRAM dc1882afa 5 DEMO MANUAL DC1882A 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 dc1882afa 6 Linear Technology Corporation LT 0114 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 2012