DEMO MANUAL DC2018A LT8330 Low IQ Boost/SEPIC/Inverting Converter with 1A, 60V Switch DESCRIPTION Demonstration circuit 2018A features the LT®8330, a low IQ boost/SEPIC/inverting converter with a 1A, 60V switch. The LT8330 allows higher input and output voltages than comparable converters and also significantly reduces input current at light loads and no load. The LT8330 regulates either positive or negative outputs and has an internally programmed switching frequency of 2MHz. DC2018A consists of two circuits: one circuit is a boost converter with an operating input voltage range from 10V to 36V and an output voltage of 48V. With a 12V input, the maximum output current for the boost is 135mA and the efficiency is 89%. The second circuit is an inverting converter which demonstrates a negative output. The operating input voltage range of the inverting converter is from 4V to 36V and the output voltage is –12V. With a 12V input, the maximum output current for the inverting converter is 270mA and the efficiency is 87%. For each DC2018A circuit, the output voltage is programmed by resistor divider feedback. The voltage divider uses high resistance values that minimize current leakage, and the feedback network also includes a 4.7pF feedforward capacitor. Each DC2018A circuit also uses a low leakage rectifier diode to further minimize input current at light loads and no load. The input supply for power to the inductor can be separated from the LT8330 VIN pin to allow operation from two input sources. A resistor divider from the input to the EN/UVLO pin programs the boost to turn off when the input falls below 9V and the inverting converter to turn off when the input falls below 3.6V. The position of the EN/UVLO CONTROL jumper either connects the EN/UVLO pin to the input supply through a resistor divider, shorts EN/UVLO to ground, or allows the EN/UVLO pin to be driven directly by a signal applied to the EN/UVLO terminal. A 50V tantalum polymer capacitor protects the input from ringing that may occur when the input is hot-plugged using long leads. Low input current at light loads, a high voltage rating and negative output capability make the LT8330 attractive for battery-powered and extended voltage range regulator circuits. DC2018A features the LT8330ES6 in a small 6-lead TSOT-23 package. The LT8330 data sheet must be read in conjunction with this demo manual to properly use or modify DC2018A. Design files for this circuit board are available at http://www.linear.com/demo/DC2018A 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 – BOOST CONVERTER PARAMETERS FOR BOOST CONVERTER CONDITIONS Specifications are at TA = 25°C MIN TYP MAX 10V Minimum Input Voltage, VIN 36V Maximum Input Voltage, VIN Maximum Output Current, IOUT VIN = 10V VIN =12V VIN = 24V VIN = 36V Input EN/UVLO Turn-On Voltage, VIN R5 =1M 1%, R6 = 215k 1%, VIN Rising Input EN/UVLO Turn-Off Voltage, VIN R5 = 1M 1%, R6 = 215k 1%, VIN Falling Output Voltage, VOUT R1 = 1M 1%, R2 = 34.8k 1% Efficiency VIN =12V, IOUT = 135mA 89% Switching Frequency VIN =12V, IOUT = 135mA 2MHz 110mA 135mA 210mA 400mA 9.5V 9.0V 45.8V 49.4V dc2018af 1 DEMO MANUAL DC2018A PERFORMANCE SUMMARY – INVERTING CONVERTER PARAMETERS FOR INVERTING CONVERTER CONDITIONS MIN Specifications are at TA = 25°C TYP MAX 4 Minimum Input Voltage, VIN 36V Maximum Input Voltage, VIN Maximum Output Current, IOUT VIN = 4V VIN = 12V VIN = 24V VIN = 36V Input EN/UVLO Turn-On Voltage, VIN R7 = 1M 1%, R8 = 806k 1%, VIN Rising 3.8V Input EN/UVLO Turn-Off Voltage, VIN R7 = 1M 1%, R8 = 806k 1%, VIN Falling 3.6V 170mA 270mA 280mA 280mA Output Voltage, VOUT R1 = 1M 1%, R2 = 71.5k 1% Efficiency VIN = 12V, IOUT = 270mA –12.5V 87% –11.5V Switching Frequency VIN = 12V, IOUT = 270mA 2MHz QUICK START PROCEDURE To evaluate the performance of the LT8330 using either the boost or inverting circuits of DC2018A, refer to Figure 1 for the proper measurement equipment setup, the Performance Summary for the maximum output current versus input voltage and then follow the procedure below. 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 terminals. See Figure 2 for proper scope probe technique. 1.Make sure the EN/UVLO CONTROL jumper JP1 or JP2 is in the ON position. 2.Connect the EN/UVLO terminal to GND with a clip-on lead. Connect the power supply (with power off), load, and meters as shown in Figure 1. 2 3.After all connections are made, turn on the input power and verify that the input voltage is between 10V and 36V for the boost or between 4V and 36V for the inverting circuit. 4.Remove the clip-on lead from EN/UVLO. Verify that the output voltage is 48V for the boost or –12V for the inverting circuit. NOTE: If the output voltage is low, temporarily disconnect the load to make sure that it is not set too high. Once the proper output voltage is established, adjust the input voltage and load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other parameters. dc2018af DEMO MANUAL DC2018A QUICK START PROCEDURE EQUIPMENT SETUP FOR INVERTING CIRCUIT EQUIPMENT SETUP FOR BOOST CIRCUIT DC2018A F01 + – – + – + – + – + – – + – + + + – REMOVABLE CONNECTION IS OPTIONAL TO ASSIST PROPER STARTUP 48VDC LOAD 400mA + – + 0V TO 36V INPUT SUPPLY 1A + – 0V TO 36V INPUT SUPPLY 1A REMOVABLE CONNECTION IS OPTIONAL TO ASSIST PROPER STARTUP – 12VDC LOAD 300mA Figure 1: Proper Measurement Equipment Setup for DC2018A dc2018af 3 DEMO MANUAL DC2018A QUICK START PROCEDURE VIN OR VOUT GND 100 100 90 90 EFFICIENCY (%) EFFICIENCY (%) Figure 2: Proper Scope Probe Technique 80 70 60 50 80 70 60 BOOST: VOUT = 48V VIN = 12V 0 40 80 120 LOAD CURRENT (mA) 160 50 INVERTING: VOUT = –12V VIN = 12V 0 60 120 180 240 LOAD CURRENT (mA) DC2018A F03a 300 DC2018A F03b Figure 3: VIN = 12V Boost and Inverting Converter Efficiencies 4 dc2018af DEMO MANUAL DC2018A QUICK START PROCEDURE BOOST CONVERTER VOUT 200mV/DIV IOUT 50mA/DIV DC2018A F04 100μs/DIV Figure 4. Output Voltage Load Transient Response for Boost Converter, VIN = 12V, VOUT = 48V, IOUT = 50mA to 100mA to 50mA INVERTING CONVERTER VOUT 200mV/DIV IOUT 100mA/DIV DC2018A F05 100μs/DIV Figure 5. Output Voltage Load Transient Response for Inverting Converter, VIN = 12V, VOUT = –12V, IOUT = 100mA to 200mA to 100mA dc2018af 5 DEMO MANUAL DC2018A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components – Boost 1 2 C1, C2 CAP., X7R, 4.7μF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L 2 1 C3 CAP., X5R, 1.0μF, 6.3V, 10% 0402 TDK, C1005X5R0J105K 3 1 C8 CAP., X7R, 4.7pF, 50V, ±0.1pF 0603 MURATA, GRM1885C1H4R7BA01D 4 1 D1 60V, 1A, SCHOTTKY RECTIFIER, SOD323 NXP, PMEG6010CEJ 5 1 L1 INDUCTOR, 6.8μH WURTH ELEKTRONIK, 74438335068 6 2 R1, R5 RES., CHIP, 1MΩ, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA 7 1 R2 RES., CHIP, 34.8k, 1/10W, 1% 0603 VISHAY, CRCW060334K8FKEA 8 1 R6 RES., CHIP, 215k 1/10W, 1% 0603 VISHAY, CRCW0603215KFKEA 9 1 U1 IC., BOOST/INVERTING CONVERTER, TSOT-23 LINEAR TECH., LT8330ES6#PBF Required Circuit Components – Inverting 1 2 C4, C6 CAP., X7R, 4.7μF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L 2 1 C7 CAP., X5R, 1.0μF, 6.3V, 10% 0402 TDK, C1005X5R0J105K 3 1 C5 CAP., X7R, 1.0μF, 100V, 10% 1206 MURATA, GRM31CR72A105KA01L 4 1 C9 CAP., X7R, 4.7pF, 50V, ±0.1pF 0603 MURATA, GRM1885C1H4R7BA01D 5 1 D2 60V, 1A, SCHOTTKY RECTIFIER, SOD323 NXP, PMEG6010CEJ 6 1 L2 INDUCTOR, COUPLED, 4.7μH, LPD5030 COILCRAFT, LPD5030-472MEC 7 2 R3, R7 RES., CHIP, 1MΩ, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA 8 1 R4 RES., CHIP, 71.5k, 1/10W, 1% 0603 VISHAY, CRCW060371K5FKEA 9 1 R8 RES., CHIP, 806k 1/10W, 1% 0603 VISHAY, CRCW0603806KFKEA 10 1 U2 IC., BOOST/INVERTING CONVERTER, TSOT-23 LINEAR TECH., LT8330ES6#PBF Optional Demo Circuit Components 1 2 C10, C11 CAP., TANT. POLYMER, 10μF, 50V, 7343 AVX., TCJD106M050R0120 2 2 C12, C13 CAP., X7R, 0.1μF, 50V, 10% 0603 MURATA, GRM188R71H104KA93D 1 10 E1-E10 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 HEADER, 4-PIN 0.079 SINGLE ROW SULLINS, NRPN041PAEN-RC 3 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G Hardware 6 dc2018af 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. E6 E5 E4 E3 E2 ON GNDB JP2 EN/UVLO OFF CONTROL EXT. GNDA 4 3 2 4 3 2 1 R7 1M 1. ALL RESISTORS ARE 0603 1%. NOTE: UNLESS OTHERWISE SPECIFIED GND EN/UVLO VIN 4V - 36V GND EN/UVLO JP1 EN/UVLO CONTROL OFF EXT. ON R5 1M 50V 7343 C10 + 10uF 50V 7343 C11 + 10uF C4 4.7uF 50V 1206 C3 1uF 6.3V 0402 R8 806K C7 1uF 6.3V 0402 U2 LT8330ES6 TP4 GND TP2 R6 215K 5 4 5 C1 GND 4.7uF TP3 50V U1 1206 LT8330ES6 4 TP1 2 INTVCC EN/UVLO L2A 4.7uH LPD5030 6 INTVCC EN/UVLO VIN 1 3 1206 C5 1uF 3 100V FBX 1 D1 R2 34.8K R1 1M L2B 4.7uH LPD5030 3 PMEG6010CEJ D2 4 PMEG6010CEJ FBX L1 6.8uH 74438335068 SW 10V - 36V E1 1 SW 6 VIN 2 GND 1 GND 2 VIN R4 71.5K R3 1M C8 4.7pF 0603 50V C9 4.7pF 0603 50V * C2 4.7uF 50V 1206 * E8 * GND BOOST VOUT 48V C6 4.7uF 50V 1206 E10 C13 0.1uF 50V 0603 GND INVERTING SEE PERFORMANCE SUMMARY FOR MAX. IOUT VERSUS VIN VOUT -12V * E9 C12 0.1uF 50V 0603 E7 SEE PERFORMANCE SUMMARY FOR MAX. IOUT VERSUS VIN DEMO MANUAL DC2018A SCHEMATIC DIAGRAM dc2018af 7 DEMO MANUAL DC2018A 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 dc2018af Linear Technology Corporation LT 0815 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015