DEMO MANUAL DC2062A LT4363-1/LT4363-2 12V Systems ISO-7637-2 Surge Stopper Description Demonstration circuit 2062A showcases the LT®4363 surge stopper in a 12V, 3A ISO-7637-2 application. Inputs of up to 50VDC and load dumps of up to 100V are limited to 25V at the output. The MOSFET is protected against output overloads by current limiting. Sustained overvoltage or overcurrent conditions cause the LT4363 to turn off after a timer delay. The LT4363-1 (DC2062A-A) latches off and is reset by pulling SHDN low for at least 100μs. The LT4363-2 (DC2062A-B) automatically retries after a cool down delay; retry is inhibited if OV is higher than 1.275V. Danger! High voltage testing should be performed by qualified personnel only. As a safety precaution at least two people should be present during high voltage testing. 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 Board Layout DC2062A is designed to withstand load dump. This high voltage is stood off by RUV4, ROV4, R7, RLED2, Q1, Q4. Maximum input voltage is limited by Q1’s 100V BVDSS rating. The permissible time at 100V is limited by MOSFET safe operating area (SOA) and R7, which dissipates slightly less than 1.2W and is capable of doing so for at least 500ms. The minimum spacing is limited by 1206 pad spacing where the gap between solder pads is 2mm, or just under 80mils. Thus, the spacing between the input plane and all other board traces is maintained at a minimum of 2mm. As a point of reference, a 2mm needle gap in air breaks down well above 1kV. Design files for this circuit board are available at http://www.linear.com/demo Specifications are at TA = 25°C PARAMETER CONDITIONS MIN TYP MAX UNITS Input supply Operating 5 12 23.5 V DC Survival 50 V Reverse Input Protection Output Regulation Voltage 500ms Transient 100 V DC Survival –30 V 1ms Transient –150 V 23.5 25 25.4 V Undervoltage Threshold 4 4.2 4.4 V Retry Inhibit Threshold 18.2 19.1 20 V 3 3.8 4.6 A Current Limit dc2062af 1 DEMO MANUAL DC2062A Quick Start Procedure ISO-7637-2 Compliance The DC2062A is fully compatible with electrical transients in a 12V ISO-7637-2 system. Compliance testing was performed by a third party company called TUV. Tests were performed at level 4, which is the most extreme condition an ISO-7637-2 system can face. The compliance report can be found on the sidebar of the LT4363 product landing page. A summary of the report is shown in Table 1. Load Dump Ride Through The DC2062A showcases the ability of the LT4363 to ride through and suppress a 100V load dump pulse. While the DC2062A can ride through load dump events, several points should be kept in mind. First, the dissipation of several components rises to significant levels during a load dump event. Since this event lasts for approximately 500ms, these components are dissipating power for an appreciable amount of time. RUV4 dissipates 200mW, ROV4 dissipates 60mW, D1 dissipates 3.2W and R7 dissipates nearly 1.2W. These components are dissipating power for the duration of the 100V pulse and have been rated appropriately. Another consideration is MOSFET SOA. Q1 dissipates an average of 80W throughout the time it is regulating a load dump pulse. While many modern MOSFETs have advertised power ratings much higher than 80W, these ratings are not indicative of performance in surge stopper applications for the following reasons: 1) The power ratings only apply for operation in triode and when the DUT is mounted on an infinite heat sink. 2) The power capability of a MOSFET reduces significantly when it is operated in saturation with a high VDS across it. MOSFET manufacturers provide an SOA graph which depicts the voltage and current conditions under which a MOSFET can be expected to operate safely. When selecting MOSFETs for a surge stopper application this graph must always be consulted carefully due to the fact that the points on the graph were tested under the previously discussed conditions. Reverse Input Protection The DC2062A features reverse protection circuitry that protects downstream components from reverse transients of up to –150V. This number is limited by the BVDSS of Q2. The reverse protection circuitry also protects against reverse DC voltage of up to –30V. DC2062A-A and DC2062A–B Options The DC2062A-A is fitted with the LT4363-1 which latches off after a timer delay in the presence of overvoltage or overcurrent conditions. Once latched off the LT4363-1 may be restarted by pulsing the SHDN pin low for at least 100μs, or by briefly cycling power. The DC2062A-B is fitted with the LT4363-2 which automatically retries after a cool-down cycle. Retry is inhibited by the OV pin, if the input is greater than 20V. Cool down time is typically 22.8 seconds. Table 1. TUV ISO-7637 Report Summary CLASSIFICATION OF FUNCTIONAL STATUS NO DEVIATION DEVIATION WITHIN SPECIFICATION DOES NOT COMPLY NOT PERFORMED 5000 Pulses q Class A n Class A q q 5000 Pulses n Class A q Class A q q +10V 10 Pulses q Class A n Class A q q –150V –150V 1 Hour n Class A q Class A q q +100V +100V 1 Hour n Class A q Class A q q 4 –7V –7V 3 Pulse q Class A n Class A q q 5 +87V +89V 3 Pulse n Class A q Class A q q TEST PULSE LEVEL IV REQUIREMENTS LEVEL PASSED # OF PULSES/ DURATION 1 2a –100V –100V +50V +50V 2b +10V 3a 3b 2 dc2062af DEMO MANUAL DC2062A Quick Start Procedure Operation Test Points The shutdown pin, SHDN, is floating so that when power is applied to the input, the LT4363 automatically turns on. The LT4363 protects the load from destruction by regulating the output voltage to a safe level during intervals of input overvoltage. DC2062A is designed to regulate the output at 25V. If the input voltage is less than 25V, power passes through directly to the output. The output is sensed by the R1/R2 divider and the FB pin. The GATE pin controls Q1 to regulate the output voltage in the event the input rises above 25V. A summary of the test points and their related LT4363 pin is shown in Table 2. Overcurrent is sensed by RSNS and the SNS and OUT pins of the LT4363. If the load current reaches 50mV/13mΩ, the GATE pin will control Q1 to regulate the output current at 3.8A. In both overcurrent and overvoltage conditions, current is sourced by the TMR pin into the timer capacitor, CTMR. It charges and upon reaching 1.375V, causes the LT4363 to turn off the MOSFET. As previously mentioned the LT4363-1 version latches off, while the LT4363-2 version automatically tries to restart the load after a 22.8 second cool-down interval. The timer interval before the MOSFET turns off is variable, depending on the type and severity of the fault, and ranges from 135ms to 640ms. The cool-down time is 22.8s. For the LT4363-2 version, automatic retry is inhibited by the OV pin if the input remains higher than 20V, as set by the ROV4-ROV6 divider. For the LT4363-1 version, the OV pin becomes a ground pin (GND, Pin 7) and it is shorted to ground by a 0Ω jumper at ROV6. The LT4363-1 version simply latches off in response to a fault. Restart by pulling SHDN low for at least 100μs, or by briefly disconnecting the input supply. The combined tolerances of the LT4363 and external resistive dividers are approximately 4% for output voltage regulation (FB pin), 5% for undervoltage (UV pin) and retry inhibit threshold (OV pin), and 21% for current limit. A performance summary is shown in a table on the schematic diagram and is silk-screened on the front of the demo board for easy reference. Table 2. Test Point LT4363 Pin INPUT (Board Input) DRAIN (Junction of Drains of Q1 & Q2) GATE GATE SNS SNS OUT OUT GND GND DGATE (Q2 Gate) VCC VCC Small Turrets No connection to any of the small turrets is necessary to make the board operate—the LT4363 defaults to the ON state. If the SHDN turret is left open, the board will turn on when power is applied. Short this turret to ground to turn off the LT4363. FLT and ENOUT are open-collector outputs. If used, pull up to the output or an output-derived external logic supply. There are no pull-ups included on DC2062A. FLT and ENOUT have 100V ratings and can sink 100μA to less than 800mV. TMR is brought out to a turret for the purpose of monitoring the waveform there. It may also be used to connect external timer capacitors. Quick Start Connect a 12V supply to INPUT, and connect a load to OUTPUT as shown in Figure 1. The circuit will turn on automatically when power is applied, and green LED1 will show that the output is up. LED3 indicates that input power is present. If the input voltage is increased above 25V, the output will shut off and LED1 will extinguish. The output will remain off until the input is brought below 20V. Similarly, if the input voltage is decreased to less than 4V the output will shut off and LED1 will extinguish. It will restart when the input rises above 5V. dc2062af 3 DEMO MANUAL DC2062A Quick Start Procedure To test ISO-7637-2 compliance, apply a transient to the input as shown in Figure 2. Use a storage oscilloscope to monitor both the input and the output, and use the NSG5500 trigger output to trigger the oscilloscope sweep. The expected output to ISO7637-2 load dump pulse 5 is shown in Figure 3. INPUT OUTPUT DC2062A LED3 LED1 0 TO 3A LOAD 12V GND GND DC2062 F01 Figure 1: Basic Test Setup INPUT OUTPUT LED3 DC2062A LED1 A SCHAFFNER NSG5500 OR EQUILIVENT 0 TO 3A LOAD GND B STORAGE OSCILOSCOPE GND DC2062 F02 Figure 2: Testing ISO-7637-2 Transients. 4 dc2062af DEMO MANUAL DC2062A Quick Start Procedure Figure 3: ISO-7637-2 Load Dump Event Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CG CAP., X7R, 47nF, 100V, 20%, 0805 AVX, 08051C473MAT2A 2 1 CL CAP., ALUM., 33µF, 50V, 20%, SMT SUN ELECT., 50CE33LX 3 1 CSNUB CAP., X5R, 10nF, 500V, 20%, 1812 AVX, 18127C103MAT2A 4 1 CTMR1 CAP., X5R, 6.8µF, 6.3V, 20%, 0805 TDK C2012X5R0J685M 5 0 CTMR2 CAP., X7R, 4.7µF, 100V, 20%, 0805 OPT 6 1 C2 CAP., X7R, 100nF, 100V, 20%, 0805 AVX, 08051C104MAT2A 7 2 C4,CUV CAP., X7R, 10nF, 200V, 20%, 0805 AVX, 08052C103MAT2A 8 5 D2, D3, D4, D5, DLED DIODE, CURRENT LIMITING, SOD123 DIODES INC, BAV3004W 9 1 D1 DIODE, TVS, 60V, SMA-DIODE DIODES INC, SMAJ60A-13-F 10 2 D6, D7 DIODE, ZENER 15V, SOD323 DIODES INC, DDZ9702S 11 4 E2, E3, E5, E8 TP, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0 12 6 E9, E10, E11, E12, E13, E14 TP, TURRET, .064" MILL-MAX, 2308-2-00-80-00-00-07-0 13 4 J1, J2, J3, J4 BANANA JACK, NON-INSULATED KEYSTONE, 575-4 14 2 LED1, LED2 LED, SMT GREEN, LED-ROHM-SML-010 ROHM, SML-010FT dc2062af 5 DEMO MANUAL DC2062A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 15 1 LED3 LED, SMT RED, LED-ROHM-SML-010 ROHM, SML-010VT 16 1 Q1 MOSFET, N-CH,100V, TO-3PN FAIRCHILD, FQA140N10 17 1 Q2 MOSFET, N-CH,150V, SO8 FAIRCHILD, FDS86240 18 2 Q3, Q5 XTOR, NPN, 40V, SOT23 DIODES INC., MMBT3904-7-F 19 1 Q4 XTOR, NPN, 300V, SOT223 FAIRCHILD, PZTA42 20 1 RG RES., CHIP, 33Ω, 1/8W, 5% 0805 NIC, NRC10J330TRF 21 1 RLED1 RES., CHIP, 3kΩ 1/4W, 5% 1206 NIC, NRC12J302TR10F 22 1 RLED2 RES., CHIP, 249k, 1/4W, 1%, 1206 NIC, NRC12F2493TRF 23 1 RLED3 RES., CHIP, 200, 1/8W, 5%, 0805 NIC, NRC10J201TRF 24 1 RLED4 RES., CHIP, 3.3k, 1/4W, 5%, 1206 NIC, NRC12J332TRF 25 2 R2, RUV6 RES., CHIP, 10k, 1/4W, 1%, 0805 NIC, NRC10F1002TRF 26 1 RSNS RES., CHIP, SENSE, 0.013Ω, 1/4W, 5%, 1206 NIC, NCST12JR013JTRF 27 1 RSNUB RES., CHIP, 100Ω, 1/2W, 5%, 1210, PULSE PROOF NIC, NRCP25J101TRF ALTERNATE PART NUMBER FOR RSNUB (3/4W PART) VISHAY, CRCW1210100RJNEAHP 28 1 RUV4 RES., CHIP, 23.2kΩ, 1/4W, 1%, 1206 NIC, NRC12F2322TRF 29 1 R1 RES., CHIP, 182k, 1/8W, 1%, 0805 NIC, NRC10F1823TRF 30 1 R3 RES., CHIP, 10Ω, 1/8W, 5% 0805 NIC, NRC10J100TRF 31 1 R7 RES., CHIP, 620, 1/4W, 5%, 1206 PULSE PROOF (FOR PROD ASSY) VISHAY, CRCW1206620RJNEAIF 32 0 R8 RES., CHIP, 240k, 1/8W, 5%, 0805 33 3 R9, R11, R12 RES., CHIP, 240k, 1/4W, 5%, 1206 NIC, NRC12J244TRF 34 1 R10 RES., CHIP, 10kΩ, 1/4W, 5%, 1206, PULSE PROOF VISHAY, CRCW120610K0JNEAIF 35 4 STANDOFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) OPT DC2062A-A 1 0 COV CAP., 0805 OPT 2 0 ROV4 RES., 1%, 1206 OPT 3 1 ROV6 RES., CHIP, 0Ω, 0805 VISHAY, CRCW08050000Z0EA 4 1 U1 I.C., LT4363IDE-1, DFN12DE-4X3 LINEAR TECH., LT4363IDE-1 DC2062A-B 1 1 COV CAP., X7R, 10nF, 200V 20%, 0805 AVX, 08052C103MAT2A 2 1 ROV4 RES., CHIP, 140K, 1/4W, 1%, 1206 NIC, NRC12F1403TRF 3 1 ROV6 RES., CHIP, 10K, 1/4W, 1%, 0805 NIC, NRC10F1002TRF 4 1 U1 I.C., LT4363IDE-2, DFN12DE-4X3 LINEAR TECH., LT4363IDE-2 6 dc2062af 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 [1] GND RLED2 249k 1206 Q5 MMBT3904 5 DC SURVIVAL DC OPERATING UV OV RETRY INHIBIT INPUT RLED4 3.3k 1206 SURGE RIDE-THROUGH J2 E5 INPUT 1 DLED BAV3004W RLED3 200 Q4 PZTA42 LED2 ZSM-T3020-G GREEN 2 1 ISO-7637-2 PULSE 5A -30V TO +50V 5V TO 23.5V 4.2V 19V LED DRIVER 1 1 2 4 LED3 ZSM-T3020-R RED R12 240k 1206 R11 240k 1206 R10 10k 1206 Q3 MMBT3904 2 3 D6 DDZ9702S 15V 3 2 1 8 7 6 5 4 * * ASSY TYPE DC2062A-A DC2062A-B U1 LT4363IDE-1 LT4363IDE-2 3 COV OPT 10nF SHDN ROV4 OPT 140k THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. R3 10 3 CG 47nF 100V RG 33 SNS __ 1206 2 SCALE = NONE SAL A. KIM T. APPROVALS ROV6 0 OHM 10k E12 E13 OUT 1 CTMR1 6.8uF 6.3V 1 RLED1 3k 1206 E8 24.5V 3A 3.8A GND 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only J4 DATE: B SIZE LT4363IDE-1/-2 1 DEMO CIRCUIT 2062A 04/11/2013, 12:38 PM IC NO. SHEET 1 2 OF 1 REV. 12V SYSTEM ISO-7637-2 SURGE STOPPER TECHNOLOGY J3 OUTPUT [2] SAL A. E3 DATE 04-11-13 APPROVED LED1 ZSM-T3020-R GREEN OUTPUT CTMR2 OPT R2 10k R1 182k SUNCON 50CE33LX CL 33uF 50V OUTPUT PRODUCTION DESCRIPTION REVISION HISTORY OUTPUT REGULATION MAXIMUM LOAD CURRENT CURRENT LIMIT TITLE: SCHEMATIC [2] FB E14 FLT ENOUT TMR GND E11 DFN12DE-4X3 2 REV RSNS 0.013 ECO U1 LT4363IDE-1/-2 GND GND UV OV/GND SHDN 8 7 6 E9 R8 240k OPT VCC GATE 2 RSNUB 100 1210 Q1 FQA140N10 1812 E10 CUSTOMER NOTICE BEHAVIOR LATCH OFF AUTO RETRY CUV 10nF 200V D1 SMAJ60A 68V DRAIN 2 CSNUB 500V 10nF 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. PIN 7 GND OV 1. ALL RESISTORS AND CAPACITORS ARE 0805. NOTE: UNLESS OTHERWISE SPECIFIED RUV6 10k 200V * COV R7 620 1206 D7 DDZ9702S 15V ROV6 1206 * ROV4 C2 100nF 100V D3 BAV3004W D2 BAV3004W 1 2 RUV4 23.2k 1206 D5 BAV3004W 1206 R9 240k DGATE Q2 FDS86240 REVERSE BATTERY PROTECTION C4 10nF 200V D4 BAV3004W 2 1 J1 2 1 INPUT 1 INPUT [1] 4 E2 3 2 1 2 3 1 2 4 1 2 1 2 5 VCC 3 2 1 OUT 1 4 GATE FLT 10 ENOUT 11 GND 9 3 SNS TMR 12 2 EP 13 1 2 D 5 A B C D DEMO MANUAL DC2062A Schematic Diagram dc2062af 7 DEMO MANUAL DC2062A 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 8 dc2062af Linear Technology Corporation LT 1013 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013