DEMO MANUAL DC1587 LTC3105EDD: Step-Up DC/DC Converter with Power Point Control and LDO Regulator DESCRIPTION
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1 LTC0EDD: Step-Up DC/DC Converter with Power Point Control and Regulator DESCRIPTION Demonstration circuit 87A is a boost converter optimized for relatively high impedance, very low voltage input power sources. It allows a user to quickly evaluate the LTC0 boost converter and regulator. Capable of operating with an input voltage as low as 0mV and as high as V, the circuit features maximum power point control (). Jumpers on the circuit board allow the user to select several voltages, three boost output voltages and three regulator output voltages. Also included are jumpers for shutdown and for selecting an external pull-up voltage for the power good status output. Terminals are provided for input and output connections, power good output and external power good supply input, shutdown input, and provisions for external resistor and diode input. This demonstration board is especially designed for low power solar cell applications. The LTC0 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual. Design fi les for this circuit board are available at 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. PERFORMANCE SUMMARY (T A = C) PARAMETER CONDITION VALUE Start-Up Input Voltage No Load, R = k, Supply ESR = 0.Ω, See Section 0mV Typical Input Voltage Range After Start-Up 0.V to V Maximum Boost Output Current V IN = V, V OUT = V, = V, Resistive Load ma.8v Boost Output Voltage V IN =.V, 00Ω Load.8V ±%.V Boost Output Voltage V IN =.V, 00Ω Load.V ±% V Boost Output Voltage V IN =.V, 00Ω Load V ±%.V Output Voltage V IN =.V, 00Ω Load.V ±%.V Output Voltage V IN =.V, 00Ω Load.V ±% V Output Voltage V IN =.V, 00Ω Load V ±% QUICK START PROCEDURE Equipment required to evaluate the LTC0 demonstration circuit include a low voltage bench power supply, digital voltmeters and suitable load resistors. Refer to Figure for proper measurement equipment setup and follow the procedure below.. Begin by placing jumpers in the following positions. JP PGOOD JP BOOST JP JP JP SHDN VPGOOD V V 0.V OFF
2 QUICK START PROCEDURE. With the power off, connect a low voltage adjustable power supply and three voltmeters as shown in Figure (ammeters are optional). Switch the power supply on and adjust the voltage to approximately 0mV, and move the JP jumper to the ON position. With no load resistor on either output, verify that the BOOST and output voltages are within the specifi cations shown in Table. Increase the input voltage to.v and connect suitable load resistors to the output terminals to verify the output voltages under load. The maximum Boost output current is dependant on V IN and the maximum output current is 6mA Maximum power point control () prevents the converter from pulling the input supply voltage down below a preset voltage level when the maximum input supply current is reached. The converter does this by dynamically reducing the converter s output voltage and current as the input voltage begins to drop due to the input power source current limitations. Without, a converter would pull the input power source down to near 0V, resulting in near zero output power. is especially useful with power sources that have relatively high or variable source impedances such as solar cells and other energy harvesting devices. The following exercise is to illustrate the function. To demonstrate the function, place a 0Ω, W resistor in series with the demo board input terminal (V IN ) to simulate a high impedance power source. Move jumper JP () to the V position and jumpers JP and JP to the V and V positions respectively and connect voltmeters to measure V IN and boost V OUT. With the power supply set to.v, apply voltage to the input. With an adjustable load on the boost output, begin increasing the load on the V output. Figure. Proper Measurement Equipment Setup
3 QUICK START PROCEDURE As the output load current increases, the voltage on V IN decreases due to the 0Ω input resistor. Figure shows V IN, V OUT and PGOOD voltages as the load current is increased over a second time period with the programmed for V. The output remains at a regulated V until the input voltage drops to the V threshold. The prevents the input voltage from dropping below V by reducing the output voltage. Without, the output voltage would drop to near 0V resulting in zero output power. Connecting the pin to will disable the function. Also shown in Figure is the Power Good (PGOOD) signal that pulls low when the Boost output voltage drops 0% below the programmed value. V IN (V) V IN LOAD CURRENT (0mA/DIV) V OUT (V/DIV) 6 BOOST V OUT (V) minal and ground. Connect a resistor of approximately 0.Ω between the supply output and V IN. Adjust the supply to approximately 0mV to 00mV and verify that the boost output is in regulation. Since this DC/DC converter is designed to operate from relatively high impedance power sources, some source resistance is neccessary for proper low voltage start-up. At very low input voltage, excessive input current may result unless there is some source resistance.. Additional demo board features include the following. Jumper JP allows the PGOOD open drain FET pull-up resistor to be connected to the output voltage or to an external voltage applied to the VPGOOD terminal. The converter can be shutdown by pulling SHDN terminal low. jumper allows the user to select several preset voltages or select the DIODE terminal when using diodes located near the solar panel for temperature tracking. A small circular pad on the board allows the LTC0 AUX pin to be probed when evaluating the circuit. Do not connect a load to this pad. SECONDS PGOOD SIGNAL dc87 F0 0 Figure. Maximum Power Point Control Programmed for V, Operating from a High Impedance Input Power Source (0Ω). To verify very low voltage start-up (0mV to 00mV) it is necessary to do the following; remove jumper JP and add an external k resistor between the ter- Figure. Correct Method For Measuring Input or Output Voltage Ripple
4 PARTS LIST ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER Required Circuit Components C Capacitor, XR, 0μF, 6.V, 0%, 080 AVX, 0806D06KATA C Capacitor, XR, 0μF, 6V, 0%, 080 Taiyo Yuden, EMKBJ06KG-T C Capacitor, NPO, pf, V, %, 00 AVX, 00A0JATA C8 Capacitor, XR, μf, 6V, 0%, 060 AVX, 060YD0KATA L Inductor, 0μH Sumida, CDRHD8NP-00N 6 R Resistor, Chip, 9k, /6W,, 00 Vishay, CRCW009KFKED 7 R Resistor, Chip, 99k, /6W,, 00 Vishay, CRCW0099KFKED 8 R6 Resistor, Chip, 0.k, /6W,, 00 Vishay, CRCW000KFKED 9 R0 Resistor, Chip, 00k, /6W,, 00 Vishay, CRCW0000KFKED 0 U IC, LTC0EDD, mm mm DFN Linear Technology, LTC0EDD Additional Circuit Components 0 C Tantalum, OPT C Capacitor, XR, μf, 6V, 0%, 080 AVX, 080YD0KATA C6 Capacitor, NPO, pf, V, %, 00 AVX, 00A0JATA C7 Capacitor, XR,.7μF, 6V, 0%, 080 Taiyo Yuden, EMKBJ7MG-T C0 Capacitor, X7R, 0nF, 0V, 0%, 060 AVX, 060C0KATA 6 R Resistor, Chip, 70k, /6W,, 00 Vishay, CRCW0070KFKED 7 R Resistor, Chip, 8k, /6W,, 00 Vishay, CRCW008KFKED 8 R Resistor, Chip, 0, 00 Vishay, CRCW000000JKED 9 R7 Resistor, Chip, 00k, /6W,, 00 Vishay, CRCW0000KFKED 0 R8 Resistor, Chip, 0k, /6W,, 00 Vishay, CRCW000KFKED R9 Resistor, Chip, 9k, /6W,, 00 Vishay, CRCW009KFKED R Resistor, Chip, 7k, /6W,, 00 Vishay, CRCW007KFKED R Resistor, Chip,.M, /6W,, 00 Vishay, CRCW00M0FKED Hardware E-E Testpoint, Turret, 0.09" Mill-Max, JP, JP Single Row Header, -Pin Samtec, TMM-0-0-L-S JP mm Double Row Header mm mm Samtec, TMM-0-0-L-D JP, JP mm Double Row Header mm mm Samtec, TMM-0-0-L-D JP-JP Shunt Samtec, SN-BK-G
5 SCHEMATIC DIAGRAM D D L 0uH CDRHD8NP-00N E +VIN C 0.V - V + C 0uF U TANT 6.V LTC0EDD (OPT.) 080 E BOOST OUTPUT E C C.8V /.V / V 6 uf SW 7 0uF VIN JP 6V 6V 9 BOOST E VOUT C pf E JP Exposed Pad FB R R Solder Side R 9K 0 99K R R E 70K 8K DIODE C R6 R7 R8 C C0 0.K 00K 0K 0nF E6 C6 C7 OUTPUT 060.V /.V / V E pf.7uf 8 PGOOD FB 080 R9 9K E7 E8 SHDN AUX 0 JP C8 PGOOD uf R0 6V 00K 060 DIODE 0.V V V JP JP PGOOD SHDN B B VPGOOD V ON OFF.V.V V V.V V VPGOOD E9 R 7K R.M 6 6 SHDN E0 TECHNOLOGY A A NOTE: UNLESS OTHERWISE SPECIFIED. ALL RESISTORS ARE IN 00 ALL CAPACITORS ARE IN 00. INSTALL SHUNTS AS SHOWN. 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.
6 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 LT 0 PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA (08) -900 FAX: (08) LINEAR TECHNOLOGY CORPORATION 00
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