DEMO MANUAL DC1568A LT3652EDD 2A Monolithic Multichemistry Battery Charger for Solar Power Description Demonstration circuit 1568A is a 2A monolithic multichemistry battery charger for solar power applications featuring the LT3652EDD. The LT3652 is a complete mid-power Li-Ion battery charger that can operate over a wide input voltage range. The charger employs a 3.3V float voltage feedback reference that allows the battery float voltage to be adjusted up to 14.4V. The LT3652 has an input voltage regulation loop which reduces charge current if the input falls below a programmed level, set with a resistor divider. The circuit provides CC/CV charging with a 2A maximum charge current that is programmed by Performance Summary PARAMETER a sense resistor. A precondition feature trickle charges a low voltage battery, and bad battery detection provides a signal if the battery does not respond to preconditioning. The LT3652EDD is available in a 12-lead (3mm × 3mm) DFN surface mount package with an exposed pad. Design files for this circuit board are available at http://www.linear.com/demo 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. (TA = 25°C) CONDITIONS VALUE Input Voltage Range 11.5V to 32V VOUT 8.14V to 8.26V Output Float Voltage Constant Voltage Mode 8.2V Output Current Limit ILIM VIN_REG Greater Than 2.7V 2A Operating Principles LT3652 is a complete monolithic mid-power Li-Ion battery charger, addressing high input voltage applications with solutions that require a minimum of external components. The IC uses a 1MHz constant frequency, average-current mode step-down architecture. The LT3652 maximizes efficiency during charging cycles by using a bootstrapped supply to drive the internal power switch. When the output voltage is programmed to 8.2V, the circuit provides full charge over a wide 11.5V to 32V input range. A precision threshold shutdown pin allows the incorporation of UVLO functionality using a simple resistor divider. The IC can also be put into a low current shutdown mode, in which the input supply bias is reduced to only 15µA. The LT3652 charge current control allows maximum power point tracking (MPPT) use with solar panels. The overall maximum charge current is set using an external inductor current sense resistor. An input voltage regulation pin allows the charger to reduce the battery charge current if necessary so the solar panel produces the most power. The LT3652 automatically enters a battery precondition mode if the sensed battery voltage is very low. In this mode, the charging current is reduced to 15% of the programmed maximum, as set by the inductor sense resistor, RSENSE. Once the battery voltage increases to the precondition threshold, the IC automatically increases dc1568afa 1 DEMO MANUAL DC1568A Operating Principles maximum charging current to the full programmed value. DC1568A programs the output voltage to be 8.2V, and the 5.7V precondition threshold is internally set as a fraction of the programmed output voltage. The LT3652 can use a charge current based C/10 termination scheme, which ends a charge cycle when the battery charge current falls to one-tenth the programmed maximum charge current. The LT3652 also contains an internal charge cycle control timer, for timer-based termination. When using the internal timer, the IC combines C/10 detection with a programmable time constraint, during which the charging cycle can continue beyond the C/10 level to “top off” a battery. The charge cycle terminates when a specific time elapses, typically three hours. When the timer based scheme is used, the IC also supports bad battery detection, which triggers a system fault if a battery stays in precondition mode for more than one-eighth of the total charge cycle time. Once charging is terminated and the LT3652 is not actively charging, the IC automatically enters a low current standby mode where supply bias currents are reduced to < 100µA. If the battery voltage drops 2.5% from the full charge float voltage, the LT3652 engages an automatic charge cycle restart. The IC also automatically restarts a new charge cycle after a bad battery fault once the failed battery is removed and replaced with another battery. The LT3652 includes provisions for a battery temperature monitoring circuit. This feature monitors battery temperature during the charging cycle using a thermistor, and suspends charging and signals a fault condition if the battery temperature moves outside a safe charging range of 0°C to 50°C. The LT3652 contains two digital open collector outputs, which provide charger status and signal fault conditions. These binary coded pins signal battery charging, standby or shutdown modes, battery temperature faults and bad battery faults. Quick Start Procedure DC1568A is easy to set up to evaluate the performance of the LT3652EDD. Using short twisted-pair leads for any power connections, with all loads and power supplies off, refer to Figure 1 for the proper measurement and equipment setup. Follow the procedure below: 1.Jumper and power supply settings: JP1 = 1 JP4 = 1 JP2 = 1 PS1 = OFF JP3 = C/10 PS2 = OFF 2.Turn on PS2 and slowly increase the voltage until VBAT is 5.4V while monitoring the current into the BAT pin. If the current is less than 5mA, turn on PS1. Increase PS1 until VIN is 12V while monitoring the input current. 3. Verify that the battery charging current, IBAT, is between 250mA and 350mA. The CHRG LED should be on and the FAULT LED should be off. 4.Increase PS2 until VBAT is 7.2V. Verify that the input current, IIN, is between 1.3A and 1.7A, the battery current, IBAT, is between 1.775A and 2.225A and that the CHRG LED is on. 5.Increase PS2 until VBAT is 8.5V. Verify that the battery charging current, IBAT, is less than 5mA and that the CHRG LED is off. 6.Decrease PS2 until VBAT is 7.8V. Verify that the battery current, IBAT, is between 1.775A and 2.225A and that the CHRG LED is on. 7.Set JP1 to 0. Verify that the charging current, IBAT, is less than 5mA and that the FAULT LED and the CHRG LED are off. 8.Set JP1 to 1. Connect a jumper from the NTC pin to ground. Verify that the charging current, IBAT, is less than 5mA and that the FAULT LED and the CHRG LED are on. dc1568afa 2 DEMO MANUAL DC1568A quick start procedure 9. Remove the jumper from NTC to ground. Verify that the charging current, IBAT, is between 1.775A and 2.225A, that the FAULT LED is off and the CHRG LED is on. 13.Set JP4 to 0. Setting JP4 to 0 turns off the charge current when VIN is less than 17.7V. Verify that the battery charging current is less than 5mA and that the CHRG LED is off. 10. Turn on LOAD1 and set to 1A. Verify that the voltage, VSYSTEM, on the SYSTEM LOAD turret is approximately equal to VIN. 14. Increase PS1 until VIN is 17.7V. Verify that the charging current is between 1.775A and 2.225A and that the CHRG LED is on. Set JP4 to 1. 11.Set JP2 to 0. Verify that the battery charging current is less than 5mA and that the CHRG LED is off. 15.Turn off PS1, PS2 and LOAD1. 12. Increase PS1 until VIN is 14V. Verify that the charging current is between 1.775A and 2.225A and that the CHRG LED is on. Set JP2 to 1. NOTE: All connections from equipment should be Kelvinconnected directly to the board pins which they are connected to on the diagram in Figure 1, and any input or output leads should be twisted pair. Figure 1. Proper Measurement Equipment Setup for the DC1568A dc1568afa 3 DEMO MANUAL DC1568A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C2, C3 CAP., X7R, 4.7µF, 50V, 10%, 1210 MURATA, GRM32ER71H475KA88L 2 1 C4 CAP., X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12B 3 1 C6 CAP., X5R, 100µF, 10V, 20%, 1210 TAIYO YUDEN, LMK325BJ107MM-T 4 1 C7 CAP., X7R, 10µF, 10V, 10%, 0805 MURATA, GRM21BR71A106KE51L 5 1 C10 CAP., X5R, 0.68µF, 10V, 10%, 0402 MURATA, GRM155R61A684KE15D 6 2 D1, D2 SMD, SCHOTTKY BARRIER RECTIFIER CENTRAL SEMI, CMSH3-40MA 7 1 D5 SMD, SCHOTTKY DIODE, SOT-23F CENTRAL SEMI, CMPSH1-4 8 1 L1 POWER INDUCTOR, 10µH, 20%, 3.5A VISHAY, IHLP2525CZER100M11 9 1 R1 RES., CHIP, 1M, 1/16W, 1%, 0402 VISHAY, CRCW04021M00FKED 10 1 R4 RES., CHIP, 536k, 1/16W, 1%, 0402 VISHAY, CRCW0402536KFKED 11 2 R5, R6 RES., CHIP, 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED 12 1 R7 RES., CHIP, 0.05Ω, 1/2W, 1%, 1206 SUSUMU, RL1632R-R050-F 13 1 R10 RES., CHIP, 619k, 1/16W, 0.1%, 0603 NIC, NTR06B6193DTRF 14 1 R11 RES., CHIP, 417k, 1/16W, 0.1%, 0603 NIC, NTR06B4173DTRF 15 1 R12 RES., CHIP, 0.1Ω, 1/2W, 1%, 1206 SUSUMU, RL1632R-R100-F 16 1 U1 MULTICHEMISTRY 2A BATTERY CHARGER FOR SOLAR POWER LINEAR TECHNOLOGY, LT3652EDD Optional Demo Board Circuit Components 1 1 C1 CAP., SMT, 390µF, 50V, 20% SUNCON, 50CE390BS 2 0 C5 CAP, OPT, 0402 CUSTOMER SELECTABLE 3 2 C8, C9 CAP, CHIP, X7R, 0.022µF, ±10%, 16V, 0402 AVX, 0402YC223KAT2A 4 1 D3 LED, RED PANASONIC, LNJ208R8ARA 5 1 D4 LED, GREEN LITE-ON, LTST-C190KGKT 6 0 D6 SMD, SCHOTTKY BARRIER RECTIFIER CENTRAL SEMI, CMSH3-40MA 7 2 R2, R3 RES., CHIP, 5.1k,1/4W, 1%, 1206 VISHAY, CRCW12065K10FKEA 8 1 R8 RES., CHIP, 20 ,1/16W, 5%, 0402 VISHAY, CRCW040220R0JNED 9 1 R9 RES., CHIP, 0 ,1/16W, 5%, 0402 VISHAY, CRCW04020000Z0ED Hardware, for Demo Board Only 1 7 E1-E7 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0 2 0 J1 HEADER, 3 PINS HIROSE ELECTRIC, DF3A-3P-2DSA 3 4 JP1-JP4 2MM SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S 4 4 JP1-JP4 SHUNT SAMTEC, 2SN-BK-G 5 4 STAND-OFF, NYLON, 0.625" TALL (SNAP ON) KEYSTONE, 8834 (SNAP ON) dc1568afa 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. A B C D 1 1 0 1 JP2 5 UVLO 1 RUN C1 390uF 50V 20% CMSH3-40MA JP1 GND E2 11.5V - 32V D1 1 + 0 1 X 0 SHDN 2 2 1 3 JP1 2 R1 1.0Meg 0 1 R2 5.1K 1206 FAULT JP2 2 TIMER R6 100K R3 5.1K 1206 C/10 D3 RED CHRG C10 0.68uF JP3 2 D4 GRN 4 0 1 4 1 3 E1 1 3 6 3 5 4 2 TIMER SHDN FAULT 13 GND SW VIN VIN_REG CHRG 12 1 Unless noted: Resistors: Ohms 0402 1% 1/16W Capacitors: 0402 10% 10V R5 100K JP4 2 R4 536K R9 0 D5 CMPSH1-4 OPT C5 2 C4 1uF 50V 0805 20 5% R8 TP1 CUSTOMER NOTICE 8 7 9 10 C2 4.7uF 50V 1210 0603 0.1% R11 417K R10 619K 0603 0.1% C3 4.7uF 50V 1210 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 L1 10uH CMSH3-40MA J.Drew Monday, March 18, 2013 DESIGNER ENGINEER J.Drew APPROVED CHECKED DRAWN APPROVALS CONTRACT NO. TP2 2 IHLP-2525CZ-11 D2 R7 0.05 1206 1/4W 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. NTC VFB BAT SENSE BOOST 11 U1 LT3652EDD 3 1 2 VIN 1 3 3 1 2 1/19/09 4/16/09 C6 100uF 10V 1210 20% C7 10uF 10V 0805 10% BAT GND NTC E6 OPT J1 GND E7 NTC DF3-3P-2DSA 1 2 3 BAT GND 8.2V 2A E5 E4 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 C9 0.022uF 16V TECHNOLOGY C8 0.022uF 16V OPT E3 SYSTEM LOAD CMSH3-40MA D6 1 SCALE: FILENAME: SIZE CAGE CODE DWG NO 1 SHEET 1 DC1568A OF LT3652EDD Multi-Chemistry 2A Battery Charger for Solar Power TITLE R12 0.1 1206 1/2W DATE 2 1 2 5 A 1 REV A B C D DEMO MANUAL DC1568A Schematic Diagram dc1568afa 5 DEMO MANUAL DC1568A 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 dc1568afa 6 Linear Technology Corporation LT 0313 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 2011