DEMO MANUAL DC2173A LTC3769 60VIN, Low IQ Synchronous Boost Controller DESCRIPTION Demonstration circuit DC2173A is a DC/DC synchronous boost converter featuring the LTC®3769 constant frequency current mode synchronous boost controller. The DC2173A generates a 48V output voltage and provides 1.5A to 6A of output current. 1.Directly from the input voltage The 150kHz constant switching frequency operation results in a small and efficient circuit. The onboard low power bias supply, based on LTC3630 high efficiency, 65V 500mA synchronous step-down converter provides a stable 10V bias voltage, which increases the overall efficiency at high input voltages. This board operates over a wide 6V to 60V input voltage range, has a 28µA quiescent current during standby mode, and has a low power onboard bias supply along with adjustable current limit. The user can select Burst Mode® operation, pulse skipping, or continuous conduction mode at light loads via an onbourd jumper. This converter provides high output voltage accuracy (typically ±3%) over the entire load and temperature range. The DC2173A supports the following methods for biasing the LTC3769 onboard controller as follows: PERFORMANCE SUMMARY 2.With the onboard low power bias supply 3.From the output voltage after start-up 4.Connecting to an external voltage source The DC2173A has a small circuit footprint and is a high performance, cost effective solution for telecom, automotive and Power over Ethernet applications. Design files for this circuit board are available at http://www.linear.com/demo/DC2173A L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER CONDITIONS Minimum Input Supply Voltage IOUT = 0A to 1.5A 6 V Maximum Input Supply Voltage IOUT = 0A to 6.0A 60 V Output Voltage Range VIN = 6V to 36V, IOUT = 0A to 6.0A Typical Switching Frequency Typical Output Ripple (VOUT, 48V) Efficiency Typical (VOUT, 48V, VIN 12V) ILOAD = 3A MIN TYP 48 ±3% MAX UNITS V 150 kHz 200 mV 96 % dc2173afa 1 DEMO MANUAL DC2173A QUICK START PROCEDURE Demonstration circuit 2173A is easy to set up to evaluate the performance of the LTC3769 controllers. Refer to Figure 1 for proper measurement equipment setup and 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 and GND terminals. See Figure 2 for proper scope probe technique. 1.Place jumper RUN (J2) in ON position, place jumper MODE (JP1) in PULSE SKIP position. 2.Place jumper AUX (JP4) in ON position. 3.Place jumper OVP (JP3) in OFF position. 4.With power off, connect the input power supply to VIN and GND. Turn the input power source on and slowly increase the input voltage. Be careful not to exceed 60V. NOTE: Make sure that the input voltage VIN does not exceed 60V. If higher operating voltage is required, power components with higher voltage ratings should be used. 4.Check for the proper output voltage of 48V. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. To synchronize DC2173A with external clock insert jumper MODE (JP1) in BURST position and apply clock signals to terminal CLKIN (E12). DC2173A Bias Circuits The demo board DC2173A shipped to be biased from the internal low power bias supply based on LTC3630. It’s accomplished by populating R42, which connect output of auxiliary power supply to VBIAS. If input or output voltages are desired as a bias source, then resistors R31 or R32 should be installed, instead of R42. Another possibility is to use external power source, by connecting it to terminal EXTVCC (E13). Please refer to LTC3769 data sheet for details. On board low power converter can be disabled by placing jumper AUX (JP4) in OFF position. Converter Efficiency DC2173A exceeds 96% efficiency at 12V input voltage generating 48V at 3A, see Figure 3. DC2173A delivers 3A of output current at 12V input; however output current changes in a range from 1.5A to 6A depending on input voltage. Figure 4 demonstrates maximum output current, as function of input voltage, assuming 48V output voltage. All measurements were conducted at room temperature, natural convection cooling with no air flow. 5.Once the proper output voltages are established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. dc2173afa 2 DEMO MANUAL DC2173A QUICK START PROCEDURE GND VIN Figure 1. Proper Measurement Equipment Setup Figure 2. Measuring Input or Output Ripple 97.0 7 96.5 6 95.5 5 95.0 IOUT (A) EFFICIENCY (%) 96.0 94.5 94.0 4 3 93.5 14V 12V 10V 6V 93.0 92.5 92.0 0.5 1.0 2.0 1.5 LOAD (A) 2.5 2 1 3.0 dc2173a F03 Figure 3. DC2173A, Efficiency vs Load for Different Input Voltages 5 10 15 VIN (V) 20 25 dc2173a F04 Figure 4. Maximum Output Current vs Input Voltage PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 3 CIN1, COUT6, COUT7 CAP., 33µF, 63V, EP-CAP SUN ELECTRONICS, 63HVH33M 2 8 CIN2-CIN4, COUT1-COUT5 CAP., X7S, 4.7µF 100V, 20%, 1210 TDK, C3225X7S2A475M 3 1 C2 CAP., NPO, 100pF, 25V, 10%, 0603 AVX, 06033A101KAT2A 4 1 C3 CAP., X7R, 15nF, 25V, 10%, 0603 AVX, 06033C153KAT2A dc2173afa 3 DEMO MANUAL DC2173A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 5 4 C4, C15, C16, C17 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A 6 1 C5 CAP., NPO, 1000pF, 25V, 10%, 0603 AVX, 06033A102KAT2A 7 1 C8 CAP., X5R, 4.7µF, 25V, 10%, 0805 AVX, 08053D475KAT2A 8 1 C18 CAP., X7R, 0.1µF, 100V, 10%, 1206 AVX, 12061C104KAT2A 9 1 C20 CAP., X7R, 47nF, 25V, 10%, 0603 AVX, 06033C473KAT2A 10 1 C21 CAP., X5R, 22µF, 16V, 10%, 1206 AVX, 1206YD226KAT2A 11 2 C22, C23 CAP., X7R, 2.2µF, 100V, 10%, 1206 MURATA, GRM31CR72A225KA73 12 1 D1 DIODE, SCHOTTKY 70V 0.07A SOD323-2 INFINEON, BAS 170W E6327 13 1 L1 IND, 10µH COILCRAFT, SER2918H-103KL 14 1 L2 INDUCTOR, POWER 220µH 0.51A SMD WURTH ELEC., 744775222 15 3 Q1, Q2, Q3 MOSFET, N-CH 60V 100A TDSON-8 INFINEON, BSC028N06LS3 G 16 2 RSNS1, RSNS2 RES., 0.006Ω 1/2W 1% 2010 SMD VISHAY, WSL20106L000FEA 17 5 R2, R3, R13, R15, R42 RES., CHIP, 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0EA 18 1 R5 RES., CHIP, 30.1k, 1%, 0603 VISHAY, CRCW060330K1FKEA 19 1 R6 RES., CHIP, 475k, 1%, 0603 VISHAY, CRCW0603475KFKEA 20 1 R8 RES., CHIP, 12.1k, 1%, 0603 VISHAY, CRCW060312K1FKEA 21 1 R9 RES., CHIP, 15k, 1%, 0603 VISHAY, CRCW060315K0FKEA 22 1 R17 RES., CHIP, 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA 23 2 R26, R35 RES., CHIP, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA 24 1 R33 RES., CHIP, 150k, 1%, 0805 VISHAY, CRCW0805150KFKEA 25 1 R34 RES., CHIP, 38.3k, 1%, 0603 VISHAY, CRCW060338K3FKEA 26 1 R39 RES., CHIP, 47k, 1%, 0603 VISHAY, CRCW060347K0FKEA 27 1 R40 RES., CHIP, 523k, 1%, 0603 VISHAY, CRCW0603523KFKEA 28 1 R41 RES., CHIP, 80.6k, 1%, 0603 VISHAY, CRCW060380K6FKEA 29 1 U1 I.C. LTC3769IUFD, QFN24UF-4X4 LINEAR TECH., LTC3769IUFD#PBF 30 1 U2 I.C. LTC3630AEMSE, MSE-16L LINEAR TECH., LTC3630AEMSE#PBF Additional Demo Board Circuit Components 1 1 C19 OPT 2 3 D2, D3, D4 OPT 3 1 Q4 OPT 4 10 R1, R4, R10, R11, R12, R14, R31, R32, R37, R38 OPT Hardware: For Demo Board Only 1 9 E1-E9 TURRET, TESTPOINT, 091" MILL-MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 HEADER, 2X3 6POS 0.100" DUAL GOLD SAMTEC, TSW-103-07-L-D 3 3 JP2, JP3, JP4 HEADER, 2mm SINGLE STR 3POS SULLINS, NRPN031PAEN-RC 4 4 J1, J2, J3, J4 BANANA JACK NON-INSULATED 0.218" KEYSTONE, 575-4 5 1 XJP1 SHUNT, 2POS0 0.100" (2.54mm) CTRS SAMTEC, SNT-100-BK-G 6 3 XJP2, XJP3, XJP4 SHUNT, 2mm CTRS SAMTEC, 2SN-BK-G 7 4 MTGS HEX STANDOFF 6-32 NYLON 3/4" KEYSTONE, 1903D 8 4 MTGS MACHINE SCREW, PAN PHILLIPS 6-32 B & F, PMSSS 632 0038 PH dc2173afa 4 A B C D * R35 JP3 OVP JP2 3 2 1 3 2 1 100K OVMODE INTVCC 6 4 2 MODE JP1 R33 150K 0805 R34 38.3K VIN 5 3 1 INTVCC D2 OPT SGND R5 30.1k R10 OPT INTVCC U1 11 12 RUN SS 8 9 7 LTC3769EUF 5 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. OPT C19 4 INTVCC SS RUN SGND PLLIN / MODE FREQ OPT R11 1000pF C5 C15 0.1uF INTVCC 5 R4 OPT 50mV R1 75mV FLOAT OPT 100mV VOUT FOLLOWS VIN WHEN VIN > REGULATED VOUT ON OFF OFF ON E9 E8 NOTES: RUN CLKIN BURST MODE (SYNC) EXTVCC RUN INTVCC E7 E6 PULSE SKIP CCM GND EXTVCC E5 13 100K 19 R8 12.1K 15K R9 OVMODE PGND INTVCC EXTVCC PGND VBIAS BG BOOST C16 0.1uF R3 0 R6 475K 0805 C3 15nF 0 R2 VBIAS VOUT 0.1uF C17 EXTVCC 0 3 R15 D1 BAS170W 1 2 OPT R31 C8 4.7uF 0805 VBIAS C4 0.1uF C2 100pF 10 22 23 24 1 21 20 SENSE1+ SENSE1- VIN R32 4 OFF ON INTVCC INTVCC 0 OPT R42 VOUT VAUX 5 Q1 OPT 4 JP4 AUX 3 2 1 4 Q2 BSC028N06LS3 1 2 3 R26 3 Q3 BSC028N06LS3 R39 47K R38 OPT 5 3 11 12 C23 2.2uF 100V 1206 COUT1 4.7uF 100V 3225 ISET FBO RUN VIN 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SW 10 6 7 SCALE = NONE VICTOR K. LT APPROVALS SS VPRG2 VPRG1 9 1 COUT3 4.7uF 100V 3225 R12 OPT VFB COUT2 4.7uF 100V 3225 SER2918H-103 L1 10uH R14 OPT U2 LTC3630AEMSE CUSTOMER NOTICE R37 OPT C18 0.1uF 100V 1206 C22 2.2uF 100V 1206 D3 OPT 2 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. D4 OPT VIN Q4 BSC028N06LS3 4 1 2 3 PGOOD 1 2 14 SENSE1- 2 ILIM 3 SENSE1+ 15 VFB 16 ITH 17 SW 5 1 2 3 5 1 2 3 18 PGOOD OVMODE TG PGND 25 5 1 2 3 INTVCC GND 4 GND 8 GND 16 GND 14 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. 17 5 1 VAUX C21 22uF 16V 1206 63HVH33M CIN1 33uF 63V + COUT7 33uF 63V 63HVH33M VOUT + DATE E4 J4 * VOUT GND VOUT- * VOUT+ VIN- GND 6 - 60V VIN VIN+ 48V / 1 - 3.0A J3 E3 E2 J2 J1 E1 VICTOR K. 05-01-2014 APPROVED DATE: N/A SIZE LTC3769EUF SHEET 1 1 DEMO CIRCUIT 2173A Thursday, May 01, 2014 IC NO. 2 OF 1 REV. HIGH VOLTAGE, LOW IQ, SYNCHRONOUS BOOST CONVERTER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only CIN4 4.7uF 100V 3225 + COUT6 33uF 63V 63HVH33M CIN3 4.7uF 100V 3225 VIN PRODUCTION DESCRIPTION REVISION HISTORY TECHNOLOGY R41 80.6K R40 523K COUT5 4.7uF 100V 3225 CIN2 4.7uF 100V 3225 TITLE: SCHEMATIC C20 47nF 220uH L2 COUT4 4.7uF 100V 3225 0.006 2010 RSNS1 0.006 2010 R13 0 2 - RSNS2 R17 10 REV ECO A B C D DEMO MANUAL DC2173A SCHEMATIC DIAGRAM dc2173afa 5 DEMO MANUAL DC2173A 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 dc2173afa 6 Linear Technology Corporation LT 0714 • REV A PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014