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17.7V to 34V Input SLA 2A Battery Charger For Solar Power Demonstration circuit 1688A is a sealed-lead acid 2A battery charger for solar power applications featuring the L T3652HVEDD. The L T3652HV is a complete mid-power battery charger that can operate over a wide input volt- age range. The charger employs a 3.3V battery voltage feedback reference that allows the voltage for charging to be adjusted up to 18V. The L T3652HV 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 constant-current/constant-voltage charging with a maximum charge current of 2A that is L, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Table 1. Typical Specifi cations (TA = 25°C) DFN surface mount package with an exposed pad. average current mode step-down architecture. which the input supply bias is reduced to only 15μA. the panel at peak output power .

the performance of the L T3652HVEDD. maximum charging current to the full programmed value. set as a fraction of the programmed output voltage. mode for more than 1/8th of the total charge cycle time. battery is removed and replaced with another battery. which provide charger status and signal fault conditions. Figure 1. L T3652HV Effi ciency Figure 2. 2A Charge Current Figure 3. Charge Current vs Input Voltage the proper measurement and equipment setup.

Figure 4. Proper Measurement Equipment Setup for DC1688A

  1. Jumper and Power Supply Setting:
  2. Turn on PS2 and slowly increase the voltage until V

is 7.5V while monitoring the current into the BAT pin. IN is 18V while monitoring the input current.

  1. Verify the battery charging current is between 250mA

current is less than 5mA and that the CHRG LED is off.

  1. Decrease PS2 until VBAT is 13.8V. Verify the battery charging

current is less than 5mA and that the CHRG LED is off.

  1. Decrease PS2 until V BAT is 12.0V. Verify the battery
  2. Set JP1 to 0. Verify the charging current is less than

5mA and that the FAUL T LED and the CHRG LED are off.

  1. Set JP1 to 1. Connect a jumper from the NTC pin to

and that the FAUL T LED and the CHRG LED are on.

  1. Remove the jumper from NTC to ground. Verify the

that the FAUL T LED is off and the CHRG LED is on.

  1. Turn on LOAD1 and set to 1A. Verify the voltage, Vsys-

IN. Turn off LOAD1. Decrease PS1 to 14.0V.

  1. Verify the battery charging current is less than 5mA

and that the CHRG LED is off.

  1. Increase PS1 to 18.5V . Verify the charging current is

is on. Set JP2 to 1. Decrease PS1 to 17.0V.

  1. Set JP4 to 0. Setting JP4 to 0 turns off the charge
  2. Increase PS1 to 19.0V. Verify the charging current is

is on. Set JP4 to 1. Set JP2 to 0. They Are Connected to on This Diagram and Any Input, or Output, Leads Should Be T wisted Pair.

DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER Required Circuit Components: 1 1 C2 CAP ., X7R, 10μF , 50V , 10%, 1210 MURATA, GRM32ER71H106KA88L 2 1 C3 CAP ., X7R, 1μF , 50V , 10%, 0805 MURATA, GRM21BR71H105KA12B 3 1 C5 CAP ., SMT , 100μF , 20V , 20% SANYO, 20SVP100M 4 1 C6 CAP ., X7R, 10μF , 25V , 10%, 1206 MURATA, GRM31CR71E106KA12L 5 1 C9 CAP ., X5R, 4.7μF , 4V , 20%, 0402 MURATA, GRM155R60G475M 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 D6 SMD, ZENER DIODE, 6.2V , SOT-23 CENTRAL SEMI, CMHZ4691TR 9 1 D8 SMD, SWITCHING DIODE, SOD323 VISHAY, 1N4148WS-V-GS08 10 1 L1 POWER INDUCTOR, 15μH, 20%, 3.5A COILCRAFT , MSS1038-153ML 11 1 R1 RES., CHIP , 1.33MEG, 1/16W , 1%, 0402 VISHAY, CRCW04021M33FKED 12 1 R4 RES., CHIP , 562K, 1/16W , 1%, 0402 VISHAY, CRCW0402562KFKED 13 2 R5, R6 RES., CHIP , 100K, 1/16W , 1%, 0402 VISHAY, CRCW0402100KFKED 14 1 R7 RES., CHIP , 0.05 OHM, 1/2W , 1%, 1206 SUSUMU, RL1632R-R050-F 15 1 R9 RES., CHIP , 174K, 1/16W , 1%, 0402 VISHAY, CRCW0402174KFKED 16 1 R10 RES., CHIP , 309K, 1/16W , 0.1%, 0603 SUSUMU, RG1608P-3093-B-T5 17 1 R11 RES., CHIP , 100K, 1/16W , 0.1%, 0603 SUSUMU, RG1608P-104-B-T5 18 1 R12 RES., CHIP , 1.00MEG, 1/16W , 1%, 0402 VISHAY, CRCW04021M00FKED 19 1 U1 SLA 2A BATTERY CHARGER FOR SOLAR POWER LINEAR TECHNOLOGY, L T3652HVEDD Additional Demo Board Circuit Components: 1 1 C1 CAP ., SMT , 390μF , 50V , 20 SANYO, 50CE390BS 2 2 C7, C8 CAP ., CHIP, X7R, 0.022μF , ±10%, 16V , 0402 AVX, 0402YC223KAT2A 3 1 D3 LED, RED PANASONIC, LN208R8ARA 4 1 D4 LED, GREEN LITE-ON, L TST-C190KGKT 5 2 R2, R3 RES., CHIP , 5.1K,1/4W , 1%, 1206 VISHAY, CRCW12065K10FKEA 6 1 R8 RES., CHIP , 20,1/16W , 5%, 0402 VISHAY, CRCW040220R0JNED Optional Demo Board Circuit Components: 1 0 C4(OPT) CAP ,. OPT , 0402 CUSTOMER SELECTABLE 2 0 D7(OPT) SMD, SCHOTTKY BARRIER RECTIFIER CENTRAL SEMI, CMSH3-40MA 3 0 D9(OPT) SMD, ZENER DIODE, 10V , SOT-23 CENTRAL SEMI, CMHZ4697 4 0 J1(OPT) HEADER, 3 PINS HIROSE ELECTRIC, DF3A-3P-2DSA 5 0 R13(OPT) RES., CHIP , 10K, 1/16W , 1%, 0402 VISHAY, CRCW040210K0FKED 6 0 R14(OPT) RES., CHIP , 100K, 1/16W , 1%, 0402 VISHAY, CRCW0402100KFKED 7 0 Q1(OPT) SMD, P-CHANNEL MOSFET , 40V , 82mΩ VISHAY, SI2319DS Hardware For Demo Board Only: 1 7 E1-E7 TESTPOINT , TURRET , .095" MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 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)

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. SCHEMATIC DIAGRAM JP1 C/10 SHDN VIN Unless noted: Resistors: Ohms 0402 1/16W Capacitors: 0402 10% 10V X RUN OPT JP2 17.7V - 34V UVLO 14.4V / 13.5V TIMER OPT OPT OPT OPT JP1 - JP2 SETTINGS CUSTOMER NOTICE: 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1uF 50V 0805 1uF 50V 0805 SYSTEM LOAD SYSTEM LOAD 562K 562K DF3-3P-2DSA (OPT) DF3-3P-2DSA (OPT) BAT1 GND2 NTC3 0.022uF 25V 0.022uF 25V OPT OPT GND GND CMHZ4691 6.2V CMHZ4691 6.2V R10 309K 0603 0.1% R10 309K 0603 0.1% 174k 174k 1N4148WS-V 1N4148WS-V + C5 100uF 20V 20% + C5 100uF 20V 20% 10uF 50V 1210 10uF 50V 1210 Si2319DS Si2319DS 1.33Meg 1.33Meg 5.1K 1206 5.1K 1206 JP3JP3 +C1 390uF 50V 20% +C1 390uF 50V 20% R14 100k R14 100k R13 10k R13 10k CMPSH1-4 CMPSH1-4 JP1JP1 L1 15uH MSS1038-153ML L1 15uH MSS1038-153ML 1 2 CHRG GRN LED-LN CHRG GRN LED-LN TP1TP1 JP4JP4 NTC NTC CMHZ4697 10V CMHZ4697 10V CMSH3-40MA CMSH3-40MAR7 0.05 1206 1/4W 0.05 1206 1/4W E5 BAT BAT FAULT RED LED-LN FAULT RED LED-LN 10uF 25V 1206 10% 10uF 25V 1206 10% 100K 100K R11 100K 0603 0.1% R11 100K 0603 0.1% LT3652HVEDD LT3652HVEDD VIN_REG2 SHDN3 BOOST 11 FAULT5 VFB 7 CHRG4 BAT 9 NTC 8 VIN TIMER6 SW SENSE 10 GND 100K 100K GND GND E1E1 5.1K 1206 5.1K 1206 0.022uF 25V 0.022uF 25V 4.7uF 20% 4.7uF 20% GND GND CMSH3-40MA CMSH3-40MA TP2TP2 CMSH3-40MA CMSH3-40MA JP2JP2 R12 1.00Meg R12 1.00Meg

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com LINEAR TECHNOLOGY CORPORA TION 2010 LT 0412 REV A • PRINTED IN USA DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (L TC) 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 ONL Y and is not provided by L TC 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 Europ ean 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 L TC fro m 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 co mpliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. L TC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. L TC 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 L TC applica- tion engineer . Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation