DEMO MANUAL DC2244A LTM8049 Dual SEPIC or Inverting Module DC/DC Converter DESCRIPTION Demonstration circuit 2244A features the LTM(R)8049, a dual SEPIC or inverting Module(R) regulator. The demo circuit is configured as two stand-alone DC/DC converters with +12.0V and -12V output voltages from an input voltage up to 20V. The switching frequencies of both channels are set at 1MHz on DC2244A. The frequency foldbacks when the output is 15% below the target regulation point during a fault or output overload, thus protects the power switch from damage. and is 1A at 12VIN. The two channels can be paralleled for higher output current with SHARE1, SHARE2 pins tied together. See the Quick Start Procedure for more information on the modification of the board, and paralleling of two outputs. Both channels can be configured as either SEPIC or inverting by simply grounding the appropriate output rail, component change, and/or PCB board cut. The maximum output current of each channel varies with the input voltage, Design files for this circuit board are available at http://www.linear.com/demo/DC2244A The LTM8049 data sheet gives complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 2244A. L, LT, LTC, LTM, Linear Technology and the Linear logo and Module are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. BOARD PHOTO dc2244afa 1 DEMO MANUAL DC2244A PERFORMANCE SUMMARY SYMBOL PARAMETER VIN Input Supply Range FSW Switching Frequency VOUT1 Output Voltage of Channel 1, SEPIC IOUT1 Maximum Output Current of Channel 1 Specifications are at TA = 25C CONDITIONS MIN TYP 2.8 VIN = 12V, IOUT1 = 1A UNITS 18 V 1 11.75 VIN = 12V MAX 12 MHz 12.25 1 V A VOUT1 (AC) Output Ripple of Channel 1 (Across C5) VIN = 12V, IOUT1 = 0.7A 60 mV 1 Efficiency of Channel 1 VIN = 12V, IOUT1 = 0.7A 82 % VOUT2 Output Voltage of Channel 2, INVERTING IOUT2 Maximum Output Current of Channel 2 VIN = 12V VOUT2 (AC) Output Ripple of Channel 2 (Across C6) VIN = 12V, IOUT2 = 0.7A 2 Efficiency of Channel 2 VIN = 12V, IOUT2 = 1A -11.75 -12 1 -12.25 V A 20 mV 81.0 % QUICK START PROCEDURE Demo circuit 2244A is an easy way to evaluate the performance of the LTM8049. Refer to Figure 1 for proper measurement equipment setup, and follow the procedure below: 1. Place JP1 and JP2 in EN position. 2. With power off, connect the input power supply to VEMI and GND. Connect the load to VOUT1P and VOUT1N, VOUT2P and VOUT2N. 3. Set voltage of the DC power supply at 12V. Turn on the power at the input. Note. Make sure that the input voltage does not exceed 20V. 4. Check for the proper output voltage between VOUT1P and VOUT1N (VOUT1P = 12V). Check for the proper output voltage between VOUT2P and VOUT2N (VOUT2N = -12V). Note. If there is no output, or output voltage value is out of the spec, temporarily disconnect the load to make sure that the load is not set too high. Note. The circuit features frequency foldback to protect the power switches during a fault or output current overload. During startup, the frequency foldback also limits the current the circuit delivers to the load. Refer to LTM8049 data sheet for more information on maximum output current and startup current. 5. Once the proper output voltage at each channel is established, adjust the load within the operating range and 2 measure the output voltage regulation, ripple voltage, efficiency and other parameters. Note. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VEMI and GND terminals, VOUT1P and VOUT1N terminals, or VOUT2P and VOUT2N terminals. See Figure 2 for proper scope probe technique. 6. An external clock can be added to the SYNC1 terminal when SYNC function is used. The clock from CLKOUT2 can be used to sync the other boards, and its duty ratio varies with the internal temperature of the module. 7. The board is set for positive output at channel 1, and negative output at channel 2. The outputs can be set to other voltages by changing the feedback resistors (R9 or R10). To modify the board for two negative outputs, cut the copper along C5 and short the other terminal of C5 to ground. Remove resistor R9 and staff the resistor R10 with proper values. Refer to Figure 3a. To modify the board for two positive outputs, cut the copper along C6 and short the other terminal of C6 to ground. Remove resistor R12 and staff the resistor R11 with proper values. Refer to Figure 3b. 8. Two outputs of same voltage can be paralleled to increase the output current capability. Make sure a 0 resistor is added to R8. To ensure better current sharing, grounds of the two output caps C5 and C6 must be connected with short wires. dc2244afa DEMO MANUAL DC2244A QUICK START PROCEDURE Figure 1. DC2244A Proper Equipment Setup VIN or VOUT GND Figure 2. Measuring Input or Output Ripple dc2244afa 3 DEMO MANUAL DC2244A QUICK START PROCEDURE (a) (b) Figure 3. Change the Boards to (a) Two Negative Outputs, (b) Two Positive Outputs 4 dc2244afa DEMO MANUAL DC2244A QUICK START PROCEDURE (a) VIN = 12V (b) VIN = 20V Figure 4. DC2244A Thermal Performance (12VIN, IOUT1 = IOUT2 = 0.7A, TA = 25C) 84 VIN = 12V 82 EFFICIENCY (%) 80 78 76 74 72 70 FSW =1MHz, CHANNEL 1 FSW = 1.5MHz, CHANNEL 1 68 66 0 0.2 0.4 0.6 0.8 1.0 1.2 LOAD CURRENT, CHANNEL 1 (A) 1.4 DC2244A F05 Figure 5. DC2244A Efficiency vs Load Current (TA = 25C) 0 OUT2: -12V AT 0.7A -10 -20 -20 -30 -30 INTENSITY (dBm) INTENSITY (dBm) 0 OUT1: 12V AT 0.7A -10 -40 -50 -60 -70 -80 -40 -50 -60 -70 -80 -90 -90 -100 -100 0 0.5 1.0 1.5 2.0 2.5 3.0 FREQUENCY (MHz) 3.5 4.0 4.5 5.0 DC2244A F06a (a) VOUT1 Noise Spectrum, IOUT1 = 0.7A 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (MHz) 4.0 4.5 5.0 DC2244A F06b (b) VOUT2 Noise Spectrum, IOUT2 = 0.7A Figure 6. Output Noise Spectrum with 0.7A Load Current (VIN = 12V, Short Output Ferrite Beads) dc2244afa 5 DEMO MANUAL DC2244A QUICK START PROCEDURE 50 45 40 AMPLITUDE (dBV/m) 35 30 25 20 15 10 5 0 -5 DATA -10 -15 CLASS 5 PEAK 0 100 200 300 400 500 600 700 800 900 FREQUENCY (MHz) 1000 DC2244A F07 Figure 7. Radiated EMI CISPR25- Class 5 Peak Limit (Vertical Polarization) with 0.7A Load Current. (VIN = 14V) PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C1, C2, C9, C10 CAP., X7R, 10F, 25V, 10%, 1206 MURATA, GRM31CR71E106KA12L 2 2 C3, C4 CAP., X7R, 22nF, 25V, 10%, 0603 MURATA, GRM188R71E223KA01D 3 1 C5 CAP, X7R, 22F, 16V, 10% , 1210 MURATA, GRM32ER71C226KE18L 4 1 C6 CAP, X5R, 47F, 16V, 10%, 1210 MURATA, GRM32ER61C476KE15K 5 2 C13, C14 CAP, X5R, 10F, 16V, 10%, 0603 MURATA, GRM188R61C106KAALD 6 2 C7, C8 CAP, X5R, 1F, 16V, 10%, 0402 MURATA, GRM155R61C105KE01D 7 1 C11 CAP, X7R, 0.1F, 25V,10%, 0402 MURATA, GRM155R71E104KE14D 8 1 C12 CAP., ALUM, 27F, 25V SUN ELECT., 25HVH27M 9 2 R1, R3 RES., CHIP., 100k, 1/10W, 1% , 0603 VISHAY, CRCW0603100KFKEA 10 3 R5, R6, R7 RES., CHIP., 80.6k, 1/10W, 1%, 0603 VISHAY, CRCW060380K6FKEA 11 1 R9 RES., CHIP., 130k, 1/10W, 1%, 0603 VISHAY, CRCW0603130KFKEA 12 1 R12 RES., CHIP., 143k, 1/10W, 1%, 0603 VISHAY, CRCW0603143KFKEA 13 2 R13, R14 RES, CHIP., 200k, 1/10W, 1%, 0603 VISHAY, CRCW0603200KFKEA 14 3 FB1, FB2, FB3 Ferrite Bead, 220 MPZ2012 TDK Corp. MPZ2012S221AT000 15 1 U1 IC., LTM8049EY BGA LINEAR TECH., LTM8049EY#PBF Additional Demo Board Circuit Components 1 2 C15, C16 (OPT) CAP, X5R, 1F, 25V, 10%, 0402 MURATA, GRM155R61E105KA12D 2 2 C17, C18 (OPT) CAP, X5R,0.47F, 16V, 10%, 0402 TDK Corporation,C1005X5R1C474K050BC 3 0 R2, R4, R8, R10, R11(OPT) RES., OPT, 0603 Hardware for Demo Board Only 1 12 E1-E12 TESTPOINT, TURRET, .094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 3 PIN 0.079 SINGLE ROW HEADER SULLIN, NRPN031PAEN-RC 3 2 XJP1, XJP2 SHUNT, .079" CENTER WURTH, 608 002 134 21 4 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON) 6 dc2244afa 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 CLKOUT2 SYNC1 EN DIS RUN2 EN DIS RUN1 GND VEMI 2.8V - 18V C10 10uF 25V 1206 27uF 25V 25HVH27M + C12 C11 0.1uF 25V 0402 R2 OPT R1 100K R4 OPT R3 100K C1 10uF 25V 1206 * 5 SEE DEMO MANUAL FOR MAXIMUM IOUT. 1. ALL RESISTORS AND CAPACITORS ARE 0603. NOTE: UNLESS OTHERWISE SPECIFIED E7 E6 JP2 1 2 3 E5 JP1 1 2 3 E4 E3 E1 FB1 220 C3 22nF 25V 4 R5 80.6k 4 C4 22nF 25V R7 80.6k R6 80.6k U1 OPT R8 G6 H7 E6 D7 F3 F4 G7 J7 K7 E7 C7 B7 LTM8049EY CLKOUT2 SYNC2 CLKOUT1 SYNC1 SHARE1 SHARE2 RT2 SS2 RUN2 RT1 SS1 RUN1 C2 10uF 25V 1206 C15 OPT 0402 3 A7 A6 A5 VIN1 VIN1 VIN1 C16 OPT 0402 L5 L6 L7 VIN2 VIN3 VIN4 3 PG1 2 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE H6 G1 G2 H1 H2 J2 J1 L1 L2 K1 K2 C2 D1 D2 E1 E2 C1 A1 A2 B1 B2 D6 VIN 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. PG2 VOUT2N VOUT2N VOUT2N VOUT2N VOUT2N FBX2 VOUT2P VOUT2P VOUT2P VOUT2P VOUT1N VOUT1N VOUT1N VOUT1N VOUT1N FBX1 VOUT1P VOUT1P VOUT1P VOUT1P C9 10uF 25V 1206 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND A3 A4 B3 B4 B5 B6 C3 C4 C5 C6 D3 D4 D5 E3 E4 E5 F1 F2 F5 F6 F7 G3 G4 G5 H3 H4 H5 J3 J4 J5 J6 K3 K4 K5 K6 L3 L4 5 R14 200K DATE: N/A SIZE VIN C14 10uF 16V C13 10uF 16V E2 E12 C8 1uF 16V 0402 E11 E10 C7 1uF 16V 0402 E9 E8 * PG2 * VOUT2N -12V VOUT2P VOUT1N VOUT1P +12V PG1 1 SHEET DUAL SEPIC OR INVERTING MODULE DC/DC CONVERTER LTM8049EY DEMO CIRCUIT 2244A 1 OF 1 4 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 220 220 Monday, October 03, 2016 IC NO. FB3 C6 47uF 16V 1210 C5 22uF 16V 1210 FB2 TECHNOLOGY C18 OPT 0402 C17 OPT 0402 TITLE: SCHEMATIC R12 143K R11 OPT R10 OPT R9 130K R13 200K 1 A B C D DEMO MANUAL DC2244A SCHEMATIC DIAGRAM dc2244afa 7 DEMO MANUAL DC2244A 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 (c) 2004, Linear Technology Corporation 8 dc2244afa Linear Technology Corporation LT 1016 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2016