DC2161A-A

DEMO MANUAL DC2161A LTC4231 Micropower Hot Swap Controller DESCRIPTION Demonstration circuit 2161A showcases the LTC®4231 Micropower Hot Swap™ Controller in a 12V, 3A application. Included on the board are input overvoltage and reverse voltage protection, input voltage dividers for UV and OV detection, an output voltage LED, jumpers to disable UV/OV, manual and remote enable control, and quiescent current measurement. There are turrets provided to monitor input voltage, output voltage, output status, quiescent current, several ground connections, timer pin, and control the ON pin. Input, output and return voltages PERFORMANCE SUMMARY are provided on banana jacks. The DC2161A-A version is used to demonstrate the LTC4231-1 which remains off after a current fault, while the DC2161A-B demonstrates the LTC4231-2 which automatically reapplies power after a cool-down period. Design files for this circuit board are available at http://www.linear.com/demo/DC2161A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C Table 1 PARAMETER CONDITIONS VALUE Input Supply Voltage Range Limited by Transient Surge Protector –24V to +24V Nominal Operating Voltage   12V Overvoltage Lockout Nominal 14.4V Undervoltage Lockout (Voltage Falling) Nominal 9.6V Undervoltage Lockout (Voltage Rising) Nominal 10.8V Output Current Limit   3A Maximum Load Capacitance   600µF Timer Expiration Period   2ms Table 2. Power Input and Output Connections NOMENCLATURE CONNECTOR Table 3. Test Points DESCRIPTION NOMENCLATURE VIN 12V J1 12V Input VIN 12V GND J2 12V Input Return GND VOUT 12V, 3A J3 12V Output GND J4 12V Output Return TURRET E1 E2, E4, E6, E8 DESCRIPTION 12V Input Monitor Ground VOUT 12V, 3A E3 12V Output Monitor STATUS E5 Status, Open Drain when Output Enabled GND E6 Ground IQ E7 Quiescent Current Monitor. Use Microammeter at This Point When JP2 Selects MEASURE IQ. ON E9 Enable LTC4231 Output. Enables Output or Selects External Control of Output TIMER E10 TIMER Pin dc2161af 1 DEMO MANUAL DC2161A JUMPERS DC2161A contains 3 jumpers. A description of each jumper follows. JP1, UV/OV. This jumper selects whether or not undervoltage or overvoltage lockout is enabled. When the jumper is in the disable position, a UV or OV condition will not block operation of the Hot Swap Controller. The default is ENABLE. JP2, IQ. The LTC4231 is a low power device, meaning it draws very little current to perform its function. Any board leakage on the GATE pin caused by board contamination or a defective MOSFET will cause this current to increase. JP2, when in the MEASURE IQ position, facilitates measurement of the quiescent current of the LTC4231 exclusive of the current of other components on the board, such as LED D2, output coupling capacitor C3, TVS diode D1, capacitor C1, voltage divider R6, R7, R8 and R9, or any leakage on the board. This current is measured via a microammeter connected between turret E7 and GND. If the MEASURE IQ position is selected, verify a microammeter is connected to prevent damage to the board via leakage between VIN and the gate of the MOSFETs. The default position for JP2 is NORMAL. JP3, ENABLE. This jumper either enables or disables the output or provides external control of the output. This is provided by the ON pin of the LTC4231. When in the ON position, the 12V VOUT is enabled. When in the OFF position, the 12V VOUT is disabled. When in the EXT position, the ON pin is connected via a 100kΩ resistor from turret E9 to the ON pin of the LTC4231. A logic 1 on this pin will enable the 12V VOUT. The default position for JP3 is ON. OPERATING PRINCIPLES The LTC4231 is a Micropower Hot Swap Controller that has a 2.7V to 36V operating range and a –40V to 40V absolute maximum voltage for the IN pin. This demo circuit is populated for +12V operation, but it can easily be readjusted for any voltage between 2.7V and 36V by replacing R6, R7, R8, and R9 in the UVL, UVH, and OV divider string. These values should be selected using guidelines suggested in the LTC4231 data sheet to minimize current drain. The DC2161A is populated with a Si7960DP dual MOSFET with one section used as a pass MOSFET and the other section used for reverse voltage protection. It also has a 15mΩ sense resistor. This combination provides an output current of 3A. Pads are provided on the PCB for external MOSFET and sense resistor connections for other voltages and currents. dc2161af 2 DEMO MANUAL DC2161A QUICK START PROCEDURE DC2161A is easy to set up to evaluate the performance of the LTC4231. Connect a power supply capable of delivering greater than 3.5A of current between 10V and 20V to the VIN jack J1 with its return lead connected to GND J2. Monitor the input voltage at turrets E1 and E2. Place a voltmeter between turrets E3 and E4. Connect an ammeter between J3 and the test loads. Connect the return lead of the test loads to jack J4. The connections are shown schematically in Figure 1. The active load should be set to provide a resistive load since the LTC4231 may not start into a constant current load. With the resistive load set at 5.4Ω, vary the input voltage from 9V to 17V and from 17V to 9V to check the UV and OV thresholds. Set the input voltage to 12V, vary the load resistance, and observe output indicator D2. Determine from the ammeter that the output remains on at 3A (4Ω). The output should turn off at approximately 3.2A. Reduce the load resistance to below 4Ω and observe an auto reset in the DC2161A-B. In the DC2161A-A, power will have to be removed and then applied to the input to reset the LTC4231. Remove the resistive load from the output and replace it with a 500µF capacitor. Observe the polarity when connecting the capacitor. Upon application of input voltage, LED D2 should illuminate to indicate VOUT is present. This indicates the Hot Swap Controller is capable of starting into a 500µF capacitor. A POWER SUPPLY V V TEST LOADS Figure 1. Proper Equipment Measurement Set-Up dc2161af 3 DEMO MANUAL DC2161A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 1 C1 CAP., X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D 2 0 C2 CAP., 0402 OPT 3 1 C3 CAP., TANT, 100µF 25V, 20%, 7343 AVX, TAJE107M025RNJ 4 1 C4 CAP., X7R, 0.082µF 16V, 10%, 0402 MURATA, GRM155R71C823KA88D 5 1 D1 DIODE, SUPPRESSORS,600W, SMB-DIODE FAIRCHILD SEMI., SMBJ24CA 6 1 D2 LED, GREEN, LED-ROHM-SML-010 ROHM, SML-010FTT86 7 10 E1-E10 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0 8 2 JP1, JP2 HEADER, 2mm SINGLE 3POS SULLINS, NRPN031PAEN-RC 9 1 JP3 HEADER, 2mm DOUBLE 3POS SAMTEC, TMM-103-02-L-D 10 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4 11 1 Q1 MOSFET, DUAL-CH, 60V, SO8-POWERPAK VISHAY SILICONIX, Si7960DP-T1-GE3 12 1 R1 RES., CHIP, 10, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA 13 1 R2 RES., SENSE, 0.015, 1/4W, 1%, 1206 VISHAY, WSL1206R0150FEA 14 1 R3 RES., CHIP, 10, 1/16W, 1%, 0402 VISHAY, CRCW040210R0FKED 15 0 R4 RES., 0402 OPT 16 1 R5 RES., CHIP, 3.32kΩ, 1/16W, 1%, 0603 VISHAY, CRCW06033K32FKEA 17 1 R6 RES., CHIP, 1.24MΩ, 1/8W, 1%, 0805 VISHAY, CRCW08051M24FKEA 18 1 R7 RES., CHIP, 12.4kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040212K4FKED 19 1 R8 RES., CHIP, 24.9kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040224K9FKED 20 1 R9 RES., CHIP, 75kΩ, 1/16W, 1%, 0402 VISHAY, CRCW040275K0FKED 21 2 R10, R11 RES., CHIP, 100kΩ, 1/16W, 5%, 0402 VISHAY, CRCW0402100KJNED 22 3 SHUNTS AS SHOWN ON ASSY DWG SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G 23 4 MH1-MH4 STAND-OFF, NYLON 0.25" KEYSTONE, 8831 (SNAP ON) DC2161A-A Additional Demo Board Circuit Components 1 1 2 1 DC2161A-GENERAL BOM U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-1 DC2161A-B Additional Demo Board Circuit Components 1 1 2 1 DC2161A-GENERAL BOM U1 I.C., MICROPOWER HOT SWAP CONTROLLER, MS12 LINEAR TECH., LTC4231IMS-2 dc2161af 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 GND VIN 12V E2 ON J2 E1 E9 5 2 1 C1 0.1uF 0603 R1 10 0603 1 2 3 R11 100k R10 100k JP1 HD1X3-079 DISABLE ENABLE UV/OV * ASSY A B U1 LTC4231-1 LTC4231-2 SUFFIX 1 2 4 1. ALL CAPACITORS ARE IN MICROFARADS, 0402. 2. ALL RESISTORS ARE IN OHM, 0402. NOTE: UNLESS OTHERWISE SPECIFIED D1 SMBJ24CA R8 23.7k R7 8.45k JP3 HD2X3-079 ENABLE 1 2 3 4 5 6 R9 66.5k R6 1.24M 0805 IN ON EXT OFF 7 6 5 4 2 GNDSW OV UVH UVL IN 1/4W 1206 12 TIMER STATUS SOURCE 11 JP2 IQ C4 0.082uF 3 BOB S. KIM T. 2 SCALE = NONE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. 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. C2 OPT 2 __ ECO + 2 D2 GREEN R5 12.1k 0603 E8 E7 E6 E10 E5 J4 DATE GND IQ GND TIMER STATUS GND VOUT 12V, 3A 08-06-14 LTC4231IMS-1/ 2 DEMO CIRCUIT 2161A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E4 E3 J3 BOB S. APPROVED DATE: Wednesday, August 06, 2014 IC NO. 1 SHEET 1 2 OF 1 REV. MICROPOWER HOT SWAP CONTROLLER N/A SIZE DESCRIPTION PRODUCTION 1 REVISION HISTORY TECHNOLOGY C3 100uF 25V 7343 REV TITLE: SCHEMATIC OUT APPROVALS R4 OPT Q1B Si7960DP 6 3 5 NORMAL MEASURE IQ CUSTOMER NOTICE 10 9 * R3 10 Q1A Si7960DP 8 7 1 U1 LTC4231 SENSE 3 2 R2 0.015 3 4 GATE J1 1 SENSE ON GATE GND 8 4 SOURCE 1 2 3 1 2 D 5 A B C D DEMO MANUAL DC2161A SCHEMATIC DIAGRAM dc2161af 5 DEMO MANUAL DC2161A 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 dc2161af 6 Linear Technology Corporation LT 1114 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com  LINEAR TECHNOLOGY CORPORATION 2014