DESCRIPTION Demonstration circuit 0A is a A, bidirectional charger/ regulator featuring the LTC 6, a bidirectional synchronous step-up charger and step-down converter. DC0A implements backup by charging a storage capacitor up to 0V in boost mode, when the input voltage is present. It discharges the storage capacitor in buck mode, providing a regulated load voltage of V to 7V (set to V), when the input is interrupted. Its wide voltage range, both in capacitor charger mode and in system backup mode, makes it well suited to a wide variety of applications. The ability of the LTC6 to boost an input rail to a relatively high voltage of 0V, combined with the DC0 option of adding external capacitor banks, makes this regulator an excellent choice for energy storage applications. The DC0A features automatic switching from charge to backup mode, A input current limit during charging, the ability to set maximum current in the backup mode of operation, Burst Mode operation, fast MHz switching frequency, and open-collector outputs to indicate charge status and input power fail. The MHz constant-frequency operation results in a small and efficient circuit. In backup mode, the LTC6 provides high output voltage accuracy over a wide load range with no minimum load requirement. DEMO MANUAL DC0A LTC6 Bidirectional Charger/Regulator for System Power Backup Demo circuit 0A is set up for automatic mode operation. In this mode, the DC0 automatically charges the energy storage capacitor when a system voltage is present. It automatically switches to work as a step-down DC/DC converter providing system backup power to the load when system power is removed. An on board MOSFET isolates the backup circuit from the input line if the system voltage is not present, implementing PowerPath functionality. The DC0A supports three levels of load current limits: A, A and A when working as step-down converter discharging the energy storage capacitor. The DC0A has a small circuit footprint. It is a high performance and cost effective solution for high voltage capacitor backup converters, servers, solid-state drives, RAID and RF systems. The LTC6's input disconnect circuitry protects the DC0A from short circuit and overcurrent conditions in the boost mode of operation, in case a short circuit occurs on a high voltage rail. A similar circuit protects the DC0A against a short circuit in step-down mode, when the load is supplied from an energy storage capacitor. Design files for this circuit board are available at http://www.linear.com/demo/dc0a L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at T A = C PARAMETER CONDITIONS UNITS Minimum Input Supply Voltage.0 V Maximum Input Supply Voltage 7.0 V System Voltage Range Backup (Step-Down) Mode.0 to 7.0 V Energy Storage Capacitor Voltage Range.0V to 0V V Typical Switching Frequency.0 MHz Efficiency Typical, Backup Mode V CAP = V, V LOAD =.0V, I LOAD = 0.A 9 % dc0afb
DEMO MANUAL DC0A QUICK START PROCEDURE Demonstration circuit 0A is easy to set up to evaluate the performance of the LTC6 bidirectional regulator. Refer to Figure for the 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 V IN or V OUT and terminals. See Figure for proper scope probe technique. To verify the capability of the DC0A for charging energy storage capacitors, proceed with the following steps:. Place jumper RUN (JP) to OFF position.. Place jumper ILIM_BUCK (JP) to.0a position.. With power off, connect the input power supply to terminals V IN (E) and, voltmeter to V CAP (E8) and, load to LOAD (E) and as shown on Figure. 0V POWER SUPPLY + + + LOAD Figure. Proper Measurement Equipment Setup VIN Figure. Measuring Input or Output Ripple dc0afb
DEMO MANUAL DC0A QUICK START PROCEDURE. Turn the input power source on and slowly increase the input voltage to.v. Set the load to 0.A. You have to see voltage around.8v on terminal LOAD, a diode forward voltage drop lower compared to V IN. If there is no output, temporarily disconnect the load to make sure that the load is not set too high.. Place jumper RUN (JP) in the ON position. Voltage on V CAP terminal should rise to 9V level. Voltage on terminal LOAD should be equal to input voltage. To verify the ability of DC0 to work in backup mode, proceed with the following: 6. Disconnect input power from V IN terminal; energy storage capacitor C starts discharging from 9V level, however LTC6 will maintain a voltage of.0v on terminal LOAD. 7. To increase holdup time, install optional capacitor C6 on the bottom side of DC0A or connect additional capacitor bank to terminals V CAP (E8) and (E7). 8. Repeat steps to 7 for different load currents and V IN voltages. 9. You can measure voltage regulation and ripple in backup mode on V LOAD terminals. 0. Make sure that input voltage on V IN terminals does not exceed 7V and V CAP voltage is not set above 0V. Figure illustrates power interruption. In the beginning of the process V IN (yellow) is.v and supplies LOAD rail, PFI signal is low and step-down converter is OFF. Once V IN value is reduced to.7v, PFI signal changes state to high, the step-down converter turns ON and starts to supply the LOAD rail by.0v taking energy from the storage capacitor C. The efficiency curve is presented in Figure. The efficiency measurement was conducted in step-down mode. A constant DC voltage of V was applied to the V CAP and terminals with the input voltage disconnected from the V IN and terminals. V LOAD V LOAD V IN V IN V/DIV V/DIV P FI P FI 00µs/DIV DC0 F0a 0ms/DIV DC0 F0b a Figure. Power interruption, V LOAD.0V, I LOAD 0.A b 96 9 9 EFFICIENCY (%) 9 9 9 90 89 88 87 86 0 0... LOAD CURRENT (A) DC0 F0 Figure. Efficiency vs Load, V CAP V, LOAD.0V, Step-Down Mode dc0afb
DEMO MANUAL DC0A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C CAP., X7R, 0.µF, V, 0%, 060 AVX, 060C0KATA C CAP., XR,.7µF,6V, 0%, 080 TDK C0XRC7K C CAP., C0G, 70pF 0V, %, 060 AVX, 060A7JATA C CAP., C0G, pf, V, %, 060 AVX, 060A0JATA C CAP., ALUM., ELECT., 000µF, 0V, 6x6. PANASONIC, EEEFKH0AM 6 C9, C CAP., POS 7µF, 0V, 0%,TQC-D PANASONIC, 0TQC7MYF 7 C0 CAP., X7R,.7µF, 0V, 0%,0 AVX, 0C7KATA 8 C, C, C CAP., X7R, 0µF, 0V, 0%, 0 AVX, 0C06KATA 9 C CAP., X7S, µf, 00V, 0%, 080 TDK C0X7SA0K 0 L IND, 7.µH POWER SUMIDA, CDEP0NP-7RMC-88 Q MOSFET, P-CHN, 0V, LFPAK VISHAY, Si9EDY-T-GE R RES., CHIP, k, /0W, %, 060 VISHAY, CRCW060KFKEA R RES., CHIP, 0.0, /W, %, 06 VISHAY, WSL06R000FEA R RES., CHIP, k, /6W, %, 060 VISHAY, CRCW060KFKEA R Res., CHIP, MEG, /0W, %, 060 VISHAY, CRCW060M00FKEA 6 R RES., CHIP, 7.k, /0W, %, 060 VISHAY, CRCW0607KFKEA 7 R6, R RES., CHIP,.k, /0W, %, 060 VISHAY, CRCW060KFKEA 8 R7, R8 RES., CHIP, 0k, /0W, %, 060 VISHAY, CRCW0600KFKEA 9 R9 RES., CHIP, 0k, /0W, %, 060 VISHAY, CRCW0600K0FKEA 0 R0 RES., CHIP, k, /0W, %, 060 VISHAY, CRCW060KFKEA U I.C., LTC6EUDD, QFNUDD-X LINEAR TECH., LTC6EUDD#PBF Additional Demo Board Circuit Components C6 CAP., ALUM. ION,6X6. C7, C8 CAP., ION, 060 R RES., ION, 060 Hardware: For Demo Board Only 0 E E0 TP, TURRET, 0.09" MILL-MAX, 0--00-80-00-00-07-0 JP HEADER, X, 0.079 SINGLE ROW WURTH, 60-00-- JP HEADER, X, 0.079 SINGLE ROW WURTH, 60-00-- XJP, XJP SHUNT, 0.079" CENTER WURTH, 608-00-- dc0afb
DEMO MANUAL DC0A SCHEMATIC DIAGRAM ECO REV REVISION HISTORY DESCRIPTION APPROVED DATE PRODUCTION VK 9-0- D D VIN V - 7V E E + C9 7uF C0.7uF 0 R K Q SI9EDY R MEG R 7.K R6.K C8 R 0.0 0 U LTC6EUDD + C 7uF C 0uF 0 V SYSTEM BUS C 0uF 0 E E LOAD C C PFI CAPGD /PFO E9 INTVCC INTVCC R7 0K PFI 0V BACKUP B B ON OFF E E6 RUN JP R R8 0K 6 8 7 IN IN CLP GATE FBSYS CAPGD /PFO RUN P P INDIS 6 INDIS 7 SW 8 SW 9 SW 0 BOOST CAP FBCAP 9 ITH 0 INTVCC ILIM NC NC L 7.uH C 0.UF INTVCC ILIM_BUCK A A A C 70pF R0 K C pf R.K C7 C uf 00V 080 C 0uF 0 + C 000uF 0V 0V MAX E8 + C6 E7 CAP CUSTOMER NOTICE 60 McCarthy Blvd. APPROVALS Milpitas, CA 90 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A Phone: (08)-900 www.linear.com CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; A TECHNOLOGY Fax: (08)-007 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO A PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL LT LTC Confidential-For Customer Use Only APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. TITLE: CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT VK SCHEMATIC NOTE: UNLESS OTHERWISE SPECIFIED PERFORMANCE OR RELIABILITY. CONTACT LINEAR BIDIRECTIONAL HIGH VOLTAGE BACKUP CONVERTER TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.. ALL RESISTORS AND CAPACITORS ARE 060. SIZE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE DATE: IC NO. LTC6EUDD DEMO CIRCUIT 0A Tuesday, September 0, 0 SHEET OF REV. Figure. DC0A Demo Circuit Schematic P R K E0 C.7uF 080 R9 0K JP 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. dc0afb
DEMO MANUAL DC0A 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 90 Copyright 00, Linear Technology Corporation 6 dc0afb LT 06 REV B PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA 90-77 (08) -900 FAX: (08) -007 www.linear.com LINEAR TECHNOLOGY CORPORATION 0