DEMO MANUAL DC96A LTC0 A, Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer Description Demonstration circuit 96A is a A, bidirectional buckboost DC/DC regulator and charger/balancer, featuring the LTC 0 boost controller. Its wide voltage range both in capacitor/battery charger mode and in system backup mode makes it well suited to a wide variety of applications using supercapacitors and batteries. The main features of this board include a wide capacitor voltage range from 0.V to 5.5V, when the controller works as a backup, buck-boost converter. The input voltage range is also wide,.8v to 5.5V, when the controller works as a charger. LTC0 also features automatic switching from charge to backup mode, programmable ±% accurate charge current, automatic capacitor balancing, Burst Mode operation, multipurpose comparator, and open-collector outputs to indicate direction of operation and end of charge. The.MHz constant-frequency operation results in a small and efficient circuit. In backup mode LTC0 provides high output voltage accuracy over a wide load range with no minimum load requirement. DC96A features two modes of operation: automatic and external direction control. In the automatic mode of operation, DC96 automatically charges the supercapacitor when a system voltage is present and works as a DC/DC converter providing system backup power to the load when system power is removed. In the external direction mode, users have control over charging and discharging the supercapacitor by changing logic on the EXT/DIR terminal. The DC96A supports three levels of input current limits 0.5A, A, A while charging the supercapacitor. The DC96A has a small circuit footprint. It is a high performance and cost effective solution for supercap, battery backup converters and chargers, servers, RAID and RF systems. DC96 supports surface-mount supercapacitors as installed C and also through-hole packages as optional C5, C8. Design files for this circuit board are available at http://www.linear.com/demo/dc96a L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Performance Summary PARAMETER CONDITIONS UNITS Minimum Input Supply Voltage.8 V Maximum Input Supply Voltage 5.5 V System Voltage Range Backup Mode.8 to 5.5 V Supercapacitor Voltage Range 0.V to 5.5 V Typical Switching Frequency. MHz Efficiency Typical, DC/DC Mode Backup Mode 9 % dc96afa
DEMO MANUAL DC96A Quick Start Procedure Demonstration circuit 96A is easy to set up to evaluate the performance of the LTC0 bidirectional regulator. Refer to Figure for proper measurement equipment setup and follow the procedure below. 5V power supply should be rated minimum A of output current. 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 V IN or V OUT and terminals. See Figure for proper scope probe technique. To verify the capability of DC96A for charging supercapacitors, proceed with the following steps:. Place jumper MODE (JP) to FIXED FREQ. position.. Place jumper FBCAP (JP5) to 5.0V position. Place jumper PROG (JP) to 0.5A position. Place switch DIR (SW) to AUTO position for automatic switch between charge or backup modes of operation.. Place jumper FB (JP) into.v to set.v voltage on the load, when supercapacitor C discharges in backup mode.. With power off, connect the input power supply to VEXT, load to, as shown on Figure. 5. Turn the input power source on and slowly increase the input voltage to.0v. Set the load to 0.A. You have to see voltage around.6v (diode forward voltage drop lower compared to VEXT) on the terminal. 6. Place jumper RUN (JP) in the ON position. Voltage on VCAP terminal should rise above.8v. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. To verify the ability of DC96 to work in backup mode, proceed with the following: 7. Disconnect input power from VEXT (E) terminal, because SW in AUTO position, supercapacitor C starts discharging, however LTC0 will maintain a voltage of.v on terminal (E). 8. Repeat steps to 7 for different charging currents and voltages. While discharging, increase load current to.0a to verify high current capability and good load regulation of LTC0 controller. 9. You can measure voltage regulation and ripple in backup mode on (E) terminals. 0.Make sure that input voltage on VEXT and terminals does not exceed 5.5V. Figure. Proper Measurement Equipment Setup dc96afa
DEMO MANUAL DC96A Quick Start Procedure VIN Figure. Measuring Input or Output Ripple Figure. Charging Mode,.5V, Input Current Set to 0.5A, Ch (Red) Input Current, 00mA/DIV, Ch (Blue) VCAP Voltage Figure. Charging Mode,.5V, Input Current Set to.0, Ch (Red) Input Current,.0A/DIV, Ch (Blue) VCAP Voltage 95 9 V CAP = 5V V SYS =.V 9 EFFICIENCY (%) 9 9 90 89 88 0.5 0.5 0.65 0.85.05.5.5.65.85 LOAD (A) dc96aa F05 Figure 5. Efficiency vs Load, Backup Mode dc96afa
DEMO MANUAL DC96A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C CAP., X5R, 7µF, 6.V, 0%, 0 AVX, 06D76KATA C SUPERCAP,.F, 5.5V, 9mm x 7mm CAP-XX, HS0F C CAP., X5R, µf, 5V, 0%, 060 AVX, 060D05KATA C CAP., X5R, 0µF, 0V, 0%, 060 AVX, 060ZD06MATA 5 C6, C9, C5, R CAP., X5R, 0.µF, 5V, 0%, 060 AVX, 060D0KATA 6 C CAP., X5R, 0µF, 0V, 0%, 060 AVX, 060ZD06MATA 7 C CAP., X5R, 70pF, 5V, 0%, 060 AVX, 060D7KATA 8 D DIODE, SCHOTTKY A 0V SOD-FL ON SEMI., MBR0LSFTG 9 D DIODE, SW DUAL 75V 00MW SC70- DIODE, BAV70W-7-F 0 L POWER INDUCTOR,.uH COILCRAFT, XAL500-MEB R RES., CHIP,, %, 060 VISHAY, CRCW060R0FKEA R RES., CHIP, 6k, %, 060 VISHAY, CRCW0606KFKEA R RES., CHIP, 576k, %, 060 VISHAY, CRCW060576KFKEA R5 RES., CHIP,.0M, %, 060 VISHAY, CRCW060M0FKEA 5 R7, R8 RES., CHIP, 6.0k, %, 060 YAGEO, RC060FR-076K0L 6 R9 RES., CHIP, 00k, %, 060 VISHAY, CRCW06000KFKEA 7 R0 RES., CHIP,.9M, %, 060 VISHAY, CRCW060M9FKEA 8 R RES., CHIP, 80k, %, 060 VISHAY, CRCW06080KFKEA 9 R RES., CHIP, k, %, 060 VISHAY, CRCW060K00FKEA 0 R RES., CHIP,.5M, %, 060 VISHAY, CRCW060M50FKEA R5 RES., CHIP, 85k, %, 060 VISHAY, CRCW06085KFKEA R6, R7 RES., CHIP, 00k, %, 060 VISHAY, CRCW06000KFKEA R8 RES., CHIP, 9k, %, 060 VISHAY, CRCW0609KFKEA R9, R0 RES., CHIP, M, %, 060 VISHAY, CRCW060M00FKEA 5 R RES., CHIP, K, %, 060 VISHAY, CRCW060K00FKEA 6 U IC., LTC0EUF, QFN mm mm LINEAR TECH., LTC0EUF#PBF Additional Demo Board Circuit Components C, C5, C8, C0, C, C6, C7 R6, R, R Hardware: For Demo Board Only JP HEADER, 0.079 SINGLE ROW 5 PIN SULLINS, NRPN05PAEN-RC JP, JP, JP5, JP6 HEADER, 0.079 SINGLE ROW PIN SULLINS, NRPN0PAEN-RC 5 JP, JP, JP, JP5, JP6 SHUNT SAMTEC, SN-BK-G E-E6, E8-E TESTPOINT, TURRET,.095" MILL-MAX, 50--00-80-00-00-07-0 5 SW SWITCH, TOGGLE SPDT ULTMINI PC TH LT 5/08/ C & K, GTMCBETR dc96afa
5 5 DEMO MANUAL DC96A Schematic Diagram VEXT E D MBR0LSFT REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE PRODUCTION VICTOR K. -9-5.8V - 5.5V D D.V.8V JP FB + C6 00uF 6.V 6.V 0 7 7 C 7uF 0 XAL500-ME U LTC0EUF C C R K RUN ON OFF C6 0.uF R 6K * + C8 5F + C5 5F E VCAP MAX. 5.5V VMID B B CHRGB E0 0.5A A A PROG R6 00K C 70pF R9 Meg MODE BURST FIXED FREQ..5V 5.0V FBVCAP E AUTO EXT.DIR DIR SW CAPOK CMPOUTB 5 6 S SW 7 SW 8 SW SW R 576K E R5.0Meg C uf C5 0.uF C0 9 0 S RSEN L.uH CMPIN RUN 5 VMID C9 0.uF JP E5 E6 7 6 8 PROG FB CHRGB DIR VCAP 9 VCAP 0 FBVCAP MODE CAPOK CMPOUTB JP5 5 R R9 00K R 80K C 0uF JP R0.9Meg BAL C HS0F.F 5.5V R.0K R8 9K JP 5 V+ E + C7 00uF R6 C uf R D BAV70W R 0.uF R7 6.0K R8 6.0K R7 Meg R.5Meg R5 85K E8 E9 R0 Meg C E E EXT.DIR E R 60 McCarthy Blvd. CUSTOMER NOTICE APPROVALS Milpitas, CA 9505 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A Phone: (08)-900 www.linear.com CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; A A TECHNOLOGY Fax: (08)-0507 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. HZ LTC Confidential-For Customer Use Only VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL NOTES: UNLESS OTHERWISE SPECIFIED APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. VICTOR K. TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT A, BIDIRECTIONAL BUCK-BOOST DC / DC REGULATOR. ALL RESISTORS ARE 060. PERFORMANCE OR RELIABILITY. CONTACT LINEAR AND CHARGER / BALANCER TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. ALL CAPACITORS ARE 060. SIZE IC NO. LTC0EUF REV.. * R IS IONAL. N/A DEMO CIRCUIT 96A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE DATE: Wednesday, April 9, 05 SHEET OF 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. dc96afa 5
DEMO MANUAL DC96A 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 0 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 60 McCarthy Blvd. Milpitas, CA 9505 Copyright 00, Linear Technology Corporation 6 dc96afa LT 065 REV A PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA 9505-77 (08) -900 FAX: (08) -0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 0