DEMO MANUAL DC1533A LTM8045 Inverting/SEPIC Module Converter with Up to 700mA Output DESCRIPTION Demo circuit DC1533A features the LTM(R)8045, an inverting/ SEPIC Module converter delivering up to 700mA of output current. DC1533A is configured as an inverting converter, but can be easily changed to a SEPIC configuration for non-inverting step-up or step-down functionality. The user adjustable features of the LTM8045 such as output voltage, switching frequency, soft-start period and undervoltage lockout can be changed on DC1533A simply by PERFORMANCE SUMMARY PARAMETER modifying or installing the appropriate resistors or capacitor. The LTM8045 data sheet must be read in conjunction with this demo manual to properly use or modify demo circuit DC1533A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25C) CONDITIONS MIN TYP MAX 2.8 Minimum Input Voltage, VIN 18 Maximum Input Voltage, VIN UNITS V V Regulator Output Voltage, VOUT- Maximum Output Current, IOUT- R2 = 60.4k -4.83 VIN = 5V VIN = 12V 430 580 Efficiency VIN = 5V, IOUT- = 400mA 80 % Switching Frequency R1 = 130k 700 kHz -5.19 V mA mA BOARD PHOTO dc1533af 1 DEMO MANUAL DC1533A QUICK START PROCEDURE Demo circuit DC1533A is an easy way to evaluate the performance of the LTM8045. Refer to Figure 1 for the proper measurement equipment setup and Figure 2 for the maximum output current versus input voltage, then follow the procedure below: NOTE: Do not hot-plug the VIN terminal at high input voltages. Hot-plugging a power supply through wire leads to the demonstration circuit can cause the voltage on the extremely low ESR ceramic input capacitor to ring to twice its DC value. In order to protect the LTM8045, an aluminum electrolytic capacitor with higher ESR is placed at the input terminals. This may protect against some, but not all, input transients due to a hot-plugged power supply. See Application Note 88 for more details. 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 VIN or VOUT and GND terminals. See Figure 3 for proper scope probe technique. 1. Place JP1 in the ON position. 2. Connect the power supply (with power off), load, and meters as shown in Figure 1. 3. After all connections are made, turn on the input power and verify that the output voltage is -5V. NOTE: If the output voltage is too low, temporarily disconnect the load to make sure that the load is not set too high. 4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. NOTE: See the section that follows for instructions to convert DC1533A to a 5VOUT SEPIC with a positive VOUT. Figure 1. Proper Measurement Equipment Setup dc1533af 2 DEMO MANUAL DC1533A QUICK START PROCEDURE 650 OUTPUT CURRENT (mA) 600 550 500 450 400 350 300 2 4 6 8 10 12 14 INPUT VOLTAGE (V) 16 18 DC1533A F02 Figure 2. Maximum Output Current vs Input Voltage for VOUT = -5V VIN OR VOUT GND DC1533A F03 Figure 3. Proper Scope Probe Technique dc1533af 3 DEMO MANUAL DC1533A Instructions to Convert DC1533A to a 5VOUT SEPIC with a Positive VOUT 1. Start with DC1533A. Disconnect all supplies and loads. 2. Remove R2 and install R3 = 45.3k as shown in Figure 4. R3 MUST BE PRESENT BEFORE OPERATION OTHERWISE THE LTM8045 MAY BE DAMAGED. Figure 4 3. Make three cuts on the top copper to separate the terminal labeled GND from the ground plane, as shown in Figure 5. The terminal labeled GND is now VOUT+. Figure 5 dc1533af 4 DEMO MANUAL DC1533A 4. Solder the exposed copper together with braid to connect the terminal labeled VOUT- to the ground plane, as shown in Figure 6. The terminal labeled VOUT- is now GND. Figure 6 5. Change C2 to 100F 6.3V 1206 or 1210. Change R1 to 115k to optimize the switching frequency. dc1533af 5 DEMO MANUAL DC1533A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., X7R, 4.7F, 25V, 10%, 1206 NIC, NMC1206X7R475K25TRPLPF 2 1 C2 CAP., X5R, 22F, 16V, 10%, 1206 AVX, 1206YD226KAT2A 3 1 C3 CAP., X7R, 10nF, 16V, 10%, 0603 AVX, 0603YC103KAT2A 4 1 R1 RES., CHIP, 130k, 1% ,0603 VIAHSY, CRCW0603130KFKEA 5 1 R2 RES., CHIP, 60.4k, 1% , 0603 VISHAY, CRCW060360K4FKED 6 1 U1 I.C., LTM8045EY#PBF, BGA LINEAR TECH., LTM8045EY#PBF SUNCON, 50CE47BS Optional Demo Circuit Components 1 0 CIN1 CAP., SMT, 47F, 50V 2 0 C4 CAP., X7R, 47F, 16V, 20%, 1210 3 0 C5 CAP., X7R, 4.7F, 25V, 10%, 1206 4 0 L1, L2 IND., 1.0H, 20%,1812 5 0 R3 RES., 0603 6 0 R4 RES., CHIP, 0, 0603 7 0 R5, R6 RES., CHIP, 0603 1 6 E1-E6 TESTPOINT, TURRET, .095" MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 2MM SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S 3 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 4 4 (STAND-OFF) STAND-OFF, NYLON 0.375" TALL KEYSTONE, 8832(SNAP ON) MURATA, LQH43CN1R0M03 VISHAY, CRCW06030000Z0EA Hardware dc1533af 6 VIN GND SYNC GND E1 E6 E4 E3 CIN1 + 47uF 50V 6.3mm DIA 2.8V - 18V C5 4.7uF 25V OPT C1 4.7uF 25V 1.0uH OPT R4 0 Ohm C3 10nF 0603 OFF3 RUN CONTROL JP1 1 ON 2 G1 F1 E1 RT SS SYNC RUN H1 GND R1 130k 700kHz G2 GND R6 OPT G3 R5 OPT G4 VIN LQH43CN1R0M03 C1 GND C2 GND C3 GND C4 GND C5 U1 LTM8045EY GND D2 GND G5 VIN GND D3 GND D1 VIN H4 GND D4 GND D5 H5 GND E2 VIN GND E3 GND E4 GND E5 GND F2 GND F3 GND F4 GND GND VOUT- VOUT- VOUT- VOUT- FB VOUT+ VOUT+ VOUT+ VOUT+ GND F5 GND B3 H3 H2 B5 B4 A5 A4 A3 B2 B1 A2 A1 VOUT* -5V GND SEE FIGURE 2 FOR THE MAXIMUM OUTPUT CURRENT VERSUS VIN. VOUTE5 E2 1. ALL RESISTORS ARE 0603 1%. 2. ALL CAPACITORS ARE 1206. NOTE: UNLESS OTHERWISE SPECIFIED * R2 60.4k C2 22uF 16V C4 47uF 16V 1210 OPT LQH43CN1R0M03 R3 OPT 1.0uH OPT L1 VOUT- L2 DEMO MANUAL DC1533A SCHEMATIC DIAGRAM dc1533af 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. 7 DEMO MANUAL DC1533A 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 dc1533af 8 Linear Technology Corporation LT 0113 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2013