DEMO MANUAL DC2239A LTC7860 High Efficiency Switching Surge Stopper/EMI Filter Description Demonstration circuit 2239A is a High Efficiency Switching Surge Stopper and EMI Filter featuring the LTC®7860. The board operates from an input range of 3.5V to 60V, provides a 3.5V to 17.2V output at 0A to 5A and is output current limited. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. The demonstration board has options for smaller MOSFET and diode packages on the back of the board for lower output current requirements. The LTC7860 high efficiency surge stopper protects loads from high voltage transients. High efficiency compared to linear circuits permits higher currents and smaller solution sizes. During an input overvoltage event, such as a load dump in vehicles, the LTC7860 controls the gate of an external MOSFET to act as a switching DC/DC regulator (PROTECTIVE PWM mode). This operation regulates the output voltage to a safe level, allowing the loads to operate through the input over-voltage event. During normal operation (SWITCH-ON mode), the LTC7860 turns on the external MOSFET continuously, passing the input voltage through to the output with minimum power loss. Performance Summary SYMBOL PARAMETER VIN Input Supply Range In addition, the output inductor and capacitor form an L-C EMI filter when in SWITCH-ON mode. An internal comparator limits the voltage across the current sense resistor and regulates the maximum output current to protect against overcurrent faults. An adjustable timer limits the time that the LTC7860 can spend in overvoltage or overcurrent regulation. When the timer expires, the external MOSFET is turned off until the LTC7860 restarts after a cool down period. By strictly limiting the time in PROTECTIVE PWM Mode when the power loss is higher, the components and thermal design can be optimized for normal operation and safely operate through high voltage input surges and/or overcurrent faults. This board is suitable for a wide range of automotive, telecom, industrial, and other applications. The LTC7860 is available in a Small 12-Pin Thermally Enhanced MSOP Package. For other output requirements, see the LTC7860 data sheet or contact the LTC factory. Design files for this circuit board are available at http://www.linear.com/demo/DC2239A L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products. Specifications are at TA = 25°C CONDITIONS MIN TYP 3.5 VOUT Output Voltage IOUT Output Current Range, Continuous Free Air 3.5 VIN – VOUT Insertion Loss VIN =14V, IOUT = 5A fSW Switching (Clock) Frequency During VIN Surge Only TPWM PROTECTIVE PWM Mode Time Limit VOUT(P-P) Output Ripple in PROTECTIVE PWM Mode VIN = 40V, VOUT = 17.2V, IOUT = 5A (20MHz BW) Approximate Size Component Area x Top Component Height 14 0 MAX 60 V 17.5 V 5 A 245 mV 535 0.85 1.06 200 18 x 16 x 6 UNITS kHz 1.24 s mVP–P mm dc2239af 1 DEMO MANUAL DC2239A Quick Start Procedure Demonstration circuit 2239 is easy to set up to evaluate the performance of the LTC7860. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE. When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor as shown in Figure 1. 1. Use an input power supply that is capable of 3.5V to 60V. Set its output to 5V. Then turn off the supply. 2. With power off, connect the supply to the input terminals +VIN and –VIN. a. Input voltages lower than 3.5V can keep the converter from turning on due to the undervoltage lockout feature of the LTC7860. b. A voltmeter with a capability of measuring at least 60V can be placed across the input terminals in order to get an accurate input Voltage measurement. 3. Turn on the power at the input. NOTE. Make sure that the input voltage never exceeds 60V. 2 4. Check for the proper output voltage of 5V. Turn off the power at the input. 5. Connect a variable load capable of sinking 5A at 17.2V to the output terminals +VOUT and –VOUT. Set the current for 0A. a. A voltmeter with a capability of measuring at least 18V can be placed across the output terminals in order to get an accurate output voltage measurement. 6. Turn on the power at the input. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 7. Once the proper output voltage is again established, adjust the load and/or input within the operating range up to 17VIN and observe the output voltage and other desired parameters. 8. Now apply an input between 18V and 60V and observe the output voltage and fault timer operation. 9. If desired, you may apply input transient profiles in the range of 0VIN to 60VIN and observe the output to illustrate operation of the circuit to prevent input surges from reaching the output. dc2239af DEMO MANUAL DC2239A Quick Start Procedure – – + VIN + + – VIN + – VOUT + – IIN LOAD + – IOUT Figure 1. Proper Measurement Equipment Setup VIN 10V/DIV VOUT 10V/DIV 10ms/DIV DC2239 F02 Figure 2. Output Response Waveform with 14V–60V–14V Input Surge, (5AOUT) (10V, 10V, 10ms/Div) dc2239af 3 DEMO MANUAL DC2239A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 CAP., ALUM., 10µF, 63V, 20%, HVH Series SUN ELECTRONIC INDUSTRIES CORPORATION, 63HVH10M 2 1 CIN2 CAP., 2.2µF, X7R, 100V, 10%, 1210 MURATA GRM32ER72A225KA35L 3 2 COUT1, COUT2 Cap., 10µF, X7R, 50V, 10%, 1210 MURATA GRM32ER71H106KA12 4 1 C1 CAP., 100pF, NP0, 25V, 5%, 0603 AVX 06033A101JAT2A 5 1 C2 CAP., 680pF, NP0, 25V, 5%, 0603 AVX 06033A681JAT2A 6 1 C4 CAP., 3.9pF, NP0, 50V, 5%, 0603 AVX 06035A3R9JAT2A 7 1 C5 CAP., 0.47µF, X5R, 16V, 20%, 0603 AVX 0603YD474MAT2A 8 1 C6 CAP., 0.1µF, X5R, 16V, 20%, 0603 AVX 0603YD104MAT2A 9 1 C7 Cap., 0.1µF, X5R, 100V, 20%, 0805 TDK, C2012X5R2A104M125AA 10 1 C8 CAP., 10pF, NP0, 50V, 5%, 0603 AVX 06035A100JAT2A 11 1 C10 CAP., 22µF, X7R, 6.3V, 10%, 1206 MURATA GRM31CR70J226KE19L 12 1 D2 DIODE, SCHOTTKY, 100V, 5A, PWRDI5 DIODES INC., PDS5100-7 13 1 D3 DIODE, ZENER, 9.1V, 500mW, SOD-123 ON SEMI., MMSZ9V1T1G 14 1 D5 DIODE, RECTIFIER, 30V, 500mA, SOD-123 DIODES INC., B0530W-7-F 15 1 L1 IND., PWR., SHIELDED, 6.8µH, 20%, XAL6060 COILCRAFT XAL6060-682MEC 16 1 Q2 XSTR., MOSFET P-CH, 60V, PWRPAK, S0-8 VISHAY Si7461DP-T1-GE3 17 1 R2 RES., 10k, 1/10W, 1%, 0603 VISHAY CRCW060310K0FKEA 18 1 R3 RES., 48.7k, 1/10W, 1%, 0603 VISHAY CRCW060348K7FKEA 19 1 R5 Res., 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA 20 1 R7 RES., SENSE, 0.012Ω, 1/2W, 1%, 2010 VISHAY WSL2010R0120FEA 21 1 R8 RES., 1Ω, 1/10W, 1%, 0603 VISHAY, CRCW06031R00FKEA 22 1 U1 I.C., Voltage Reg. MSOP(12)-MSE LINEAR TECH.CORP. LTC7860EMSE#PBF Additional Demo Board Circuit Components 1 0 CIN3 CAP., OPTION, 1210 OPT 2 0 COUT3 CAP., OPTION, 0603 OPT 3 0 C9 CAP., OPTION, D CASE OPT 4 0 D1 DIODE, OPTION, DFN3030-8 OPT 5 0 D4 DIODE, OPTION, SOD-323 OPT 6 0 Q1 XSTR, OPTION POWER_33 OPT 7 0 R1, R9, R11 RES., OPTION, 0603 OPT 8 4 R4, R6, R10, R12 RES., 0Ω, 1/10W, 5%, 0603 VISHAY, CRCW06030000Z0EA Hardware: For Demo Board Only 1 4 E1, E2, E8, E9 TEST POINT, TURRET, 0.094" MTG. HOLE MILL-MAX 2501-2-00-80-00-00-07-0 2 0 E10, E11 TEST PAD TEST PAD 3 1 JP1 CONN., HEADER, 1X3, 2mm SAMTEC TMM-103-02-L-S 4 4 J3, J4, J5, J6 CONN., JACK, BANANA, Non-Insulated, 0.218" KEYSTONE, 575-4 5 1 XJP1 SHUNT, 2mm SAMTEC 2SN-BK-G 6 4 4 CORNERS 7 1 4 STANDOFF, NYLON, SNAP-ON, 0.375" KEYSTONE 8832 PCB, High Voltage Surge Suppressor with Timer DEMO CIRCUIT 2239A dc2239af 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 R3 48.7K 1% + R4 0 Ohm C4 3.9pF 5% C10 22uF 1206 CIN1 10uF 63V 5 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED GND 3.5V-60V VIN R1 R5 1.0M 1% OPT C2 680pF R2 10.0K 1% 0.1uF C6 FREQ 4 ITH VFB SS GND FREQ TMR C8 10pF 5% 6 5 4 3 2 1 13 GND D5 JP1 2 3 SHDN 1 R10 0 Ohm R11 VIN ON OFF (D1 OPT) D2 PDS5100-13 PowerDi5 OPT 0.1uF 100V 0805 C7 R6 0 Ohm CUSTOMER NOTICE D4 OPT R9 OPT VOUT 0.47uF C5 C1 100pF 5% 1 R8 D3 MMSZ9V1T1G R7 0.012 2010 XAL6060-682ME COILCRAFT 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. L1 6.8uH LT SCALE = NONE DAVID B. 2 COUT1 10uF 50V 1210 COUT2 10uF 50V 1210 DATE GND 3.5V-17V 5A VOUT 1/30/15 DAVID B. APPROVED DATE: N/A IC NO. Thursday, March 26, 2015 1 LTC7860EMSE DEMO CIRCUIT 2239A SHEET 1 OF 1 1 REV. LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 COUT3 OPT 0603 1 HIGH VOLTAGE SURGE SUPPRESSOR WITH TIMER SIZE 2 C9 OPT 7343 TECHNOLOGY + VOUT DESCRIPTION PRODUCTION 1 REVISION HISTORY REV TITLE: SCHEMATIC ECO APPROVALS SW (Q1 OPT) Q2 Si7461DP 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. 0 Ohm R12 7 8 9 10 11 12 GATE B0530W 3 Figure 3. DC2239A Demo Circuit Schematic FREQ VFBN RUN CAP SENSE VIN GATE CIN2 2.2uF 100V 1210 LTC7860EMSE U1 CIN3 OPT 100V 1210 VIN 1 2 4 1 2 5 A B C D DEMO MANUAL DC2239A Schematic Diagram dc2239af 5 DEMO MANUAL DC2239A 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 6 dc2239af Linear Technology Corporation LT 0415 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014