DEMO MANUAL DC1737A LTC3863 Low IQ Inverting DC/DC Converter DESCRIPTION Demonstration circuit 1737A is a current-mode inverting DC/DC converter featuring the LTC®3863. The board operates from an input range of 4.5V to 16V, and provides a –5.2V, 1.7A output or a –12V, 1A output (jumper selectable). It operates at 400kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode® operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided. The demonstration board has options for larger MOSFET and diode packages on the back of the board for higher output current requirements. PERFORMANCE SUMMARY SYMBOL PARAMETER This board is suitable for a wide range of automotive, telecom, industrial, and other applications. The LTC3863 is available in small 12-pin thermally enhanced MSOP and DFN Packages. For other output requirements, see the LTC3863 data sheet or contact the LTC factory. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITIONS MIN TYP MAX 4.5 16 UNITS VIN Input Supply Range VOUT Output Voltage IOUT Output Current Range, Continuous fSW Switching (Clock) Frequency VOUT P-P Output Ripple VIN = 12V, VOUT = –12V, IOUT = 1A (20MHz BW) VREG Output Regulation Line and Load (4.5VIN to 16VIN, –12VOUT, 0A to 1A Out) ±0.1 % POUT/PIN Efficiency (See Figure 3) VIN = 12V, VOUT = –12V, IOUT = 1A 89.3 % Approximate Size Component Area × Top Component Height –5.2V/–12V Free Air 0 V V –1.7/1.0 A 400 kHz 30 mVP-P 0.9 × 0.8 × 0.18 Inches dc1737af 1 DEMO MANUAL DC1737A QUICK START PROCEDURE Demonstration circuit 1737 is easy to set up to evaluate the performance of the LTC3863. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: b.If efficiency measurements are desired, an ammeter capable of measuring 2A DC or a resistor shunt can be put in series with the input supply in order to measure the DC1737A’s input current. 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. c. A voltmeter with a capability of measuring at least 16V can be placed across the input terminals in order to get an accurate input voltage measurement. 1.Set an input power supply that is capable of 4.5V to 16V to 5V. Then turn off the supply. 2.With power off, connect the supply to the input terminals +VIN and –VIN. 3.Turn on the power at the input. Note: Make sure that the input voltage never exceeds 16V. 4.Check for the proper output voltage of –5.2V. Turn off the power at the input. a. Input voltages lower than 4.5V can keep the converter from turning on due to the undervoltage lockout feature of the LTC3863. – + VIN + VIN A + + – V VOUT LOAD V + – – IIN – A + IOUT Figure 1. Proper Measurement Equipment Setup dc1737af 2 DEMO MANUAL DC1737A QUICK START PROCEDURE 5.Once the proper output voltage is established, connect a variable load capable of sinking 1.7A at 5.2V to the output terminals +VOUT and –VOUT. Set the current for 0A. a. If efficiency measurements are desired, an ammeter or a resistor shunt that is capable of handling 1.7A DC can be put in series with the output load in order to measure the DC1737A’s output current. b.A voltmeter with a capability of measuring at least 12V 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 and observe the output voltage regulation, ripple voltage, efficiency and other desired parameters. 8.Remove the VOUT jumper to observe operation at –12VOUT up to 1A. 90 85 90 VIN = 5V 85 EFFICIENCY (%) EFFICIENCY (%) VIN = 5V 80 VIN = 12V 75 70 65 0.01 80 VIN = 12V 75 70 0.1 IOUT (A) 1 65 0.01 0.1 IOUT (A) 1 Figure 2. –12VOUT Efficiency with Burst Mode Operation at Light Loads Figure 3. –5.2VOUT Efficiency with Burst Mode Operation at Light Loads Figure 4. Output Ripple at 12VIN, –12VOUT and 1A Out (50mV, 2µs/Div, 20MHz) Figure 5. Transient Response Waveform at 12VIN, –12VOUT and 0.5A to 1A to 0.5A Out (0.5A, 100mV, 10µs/Div) dc1737af 3 DEMO MANUAL DC1737A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 Cap., SMT, 100µF, 20V, SVP OSCON SANYO, 20SVP100M 2 2 CIN2, CIN3 CAP.,X7R, 10µF, 25V, 20%, 1210 TDK, C3225X7R1E106M 3 2 COUT1, COUT2 CAP.,X7R, 33µF, 16V, 20%, 1812 TDK, C4532X7R1C336M 4 2 COUT3, COUT5 CAP.,POSCAP, 150µF, 16V 7343 PANASONIC, 16TQC150MYF 5 1 COUT4 CAP.,X7R, 1µF, 16V, 10%, 0603 AVX, 0603YC105KAT2A 6 1 C1 Cap., NPO, 100pF, 50V, 10%, 0603 AVX, 06035A101kAT1A 7 1 C2 Cap., X7R, 27nF 25V, 10%, 0603 AVX, 06033C273KAT 8 1 C3 Cap., NPO, 390pF, 25V, 1%, 0603 AVX, 06033A391FAT2A 9 1 C5 Cap., X7R, 0.47µF, 16V, 20%, 0603 AVX, 0603YC474MAT2A 10 1 C6 Cap., X7R, 0.1µF, 16V, 20%, 0603 AVX, 0603YC104MAT2A 11 1 C7 Cap., X7R, 0.1µF, 100V, 20%, 0805 TDK, C2012X7R2A104M 12 1 C8 CAP., NPO, 68pF, 50V, 5%, 0603 AVX, 06035A680JAT2A 13 1 D1 DIODE, PDS540, POWERDI5-2PIN DIODES INC, PDS540-13 14 1 L1 IND, 10uH, 20%, D104C TOKO, 919AS-100M=P3 15 1 Q1 TRANSISTOR, SI7129DN, PWRPAK1212-8 VISHAY, Si7129DN-T1-GE3 16 1 R1 RES., CHIP, 61.9k, 1/16W, 1% , 0603 VISHAY, CRCW060361K9FKED 17 1 R2 RES., CHIP, 14.7k, 1/16W, 1% , 0603 VISHAY, CRCW060314K7FKED 18 1 R3 RES., CHIP, 80.6k, 1/16W, 1% , 0603 VISHAY, CRCW060380K6FKED 19 1 R5 RES., CHIP, 523k, 1/16W, 1% , 0603 VISHAY, CRCW0603523KFKED 20 1 R7 RES., 0.016 1/2W 1% 2010 VISHAY, WSL2010R0160FEA 21 1 R8 RES., CHIP, 100k, 1/16W, 1% , 0603 VISHAY, CRCW0603100KFKED 22 1 R9 RES., CHIP, 698k, 1/10W, 1% , 0603 VISHAY, CRCW0603698KFKED 23 1 R11 RES., CHIP, 45.3k, 1/16W, 1% , 0603 VISHAY, CRCW060345K3FKED 24 1 U1 IC, LTC3863EMSE, MSE12 LINEAR TECH.CORP. LTC3863EMSE Additional Demo Board Circuit Components 25 0 COUT6 CAP., OPT KE0 OPT 26 0 C4 CAP., OPT 0603 OPT 27 1 R4 RES., OPT 0603 OPT 28 2 R6, R10 RES., CHIP, 0Ω, 1/16W, 0603 VISHAY, CRCW06030000Z0ED Hardware For Demo Board Only 29 7 E1, E2, E3, E4, E5, E6, E7 TESTPOINT, TURRET, .090” pbf MILL-MAX, 2501-2-00-80-00-00-07-0 30 2 JP1, JP3 JMP, 0.079 SINGLE ROW HEADER, 3-PIN SULLINS, NRPN031PAEN-RC 31 1 JP2 JMP, 0.079 DOUBLE ROW HEADER, 6-PIN SULLINS, NRPN062PAEN-RC 32 4 J1, J2, J3, J4 CONN, BANANA JACK KEYSTONE 575-4 33 3 XJP1, XJP2, XJP3 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 34 4 MTGS AT 4 CORNERS STAND-OFF, SNAP ON NYLON 0.50" tall KEYSTONE, 8833(SNAP ON) dc1737af 4 DEMO MANUAL DC1737A SCHEMATIC DIAGRAM dc1737af 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. 5 DEMO MANUAL DC1737A 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 dc1737af 6 Linear Technology Corporation LT 0513 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013