DEMO MANUAL DC1733A LT3669 Industrial Transceiver with Integrated Step-Down Regulator and LDO DESCRIPTION Demonstration circuit 1733A is an industrial transceiver with integrated step-down regulator and LDO featuring the LT®3669. The board operates from 7.5V to 40V when JP7 is set to L+. When the JP7 is set to RES, the minimum input voltage is 16.5V. The board withstands transients up to 60V. The step-down regulator output is 5V. The LDO output is 3.3V. There are two assembly versions. DC1733A-A is for the LT3669 and DC1733A-B is for the LT3669-2. The difference is the LT3669 has an integrated catch diode. The LT3669-2 requires an external catch diode. Table 1 shows the differences between the two versions. PERFORMANCE SUMMARY SYMBOL L+ Input Supply VBUCK The LT3669 data sheet gives complete descriptions of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for working on or modifying the demo circuit 1733A. Design files for this circuit board are available. Call the LTC Factory. L, LTC, LTM, LT, Burst Mode are registered trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products.. Specifications are at TA = 25°C CONDITIONS MIN Output Voltage Step-Down Regulator VLDO Output Voltage LDO IBUCK Maximum Buck Output Current LT3669, Step-Down Regulator VBUCK = 5V 100 mA LT3669-2, Step-Down Regulator VBUCK = 5V 300 mA LT3669, VLDO = 3.3V 100 mA LT3669-2, VLDO = 3.3V 150 mA ILDO FSW EFF PARAMETER The board also provides various interfaces for line drivers and receivers. JP8 to JP11 set the signal sources or levels for TXEN1, TXEN2, TXD1 and TXD2. TYP MAX 40 V 4.75 5 5.25 V 3.135 3.3 3.465 V 7.5 Maximum LDO Output Current Switching Frequency 600 LT3669, L+ = 12V, V Efficiency BUCK = 5V, IBUCK = 100mA LT3669-2, L+ = 12V, VBUCK = 5V, IBUCK = 300mA TRST Reset Timeout Period C5=100nF UNITS kHz 65 % 76 % 12.5 ms Table 1. Version Table ASSY TYPE U1 ILDO IBUCK C8 DC1733A-A DC1733A-B LT3669EUFD 0.1A 0.1A 10µF LT3669EUFD-2 0.15A 0.3A 22µF C9 D6 L1 0.1µF OPEN 82µH, CDRH4D22HPNP-820MC 0.22µF DFLS160 33µH, CDRH50D28RNP-330MC dc1733af 1 DEMO MANUAL DC1733A QUICK START PROCEDURE Demonstration circuit 1733A is easy to set up to evaluate the performance of the LT3669 or the LT3669-2. 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 terminals of the input or output capacitors. See Figure 2 for proper scope probe technique. 1. Place jumpers in the proper positions. 2. With power off, connect an input power supply to L+ and L–/GND. The input supply can be a bench power supply or can be from the respective output from a master controller. 3. With power off, connect the load to VBUCK and GND. 5. Turn on the power at the input. 6. Check for the proper output voltages. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high or is shorted. 7. Once the proper output voltage is established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. 8. To test driver and receiver functions, use JP8 to JP11 to set up the proper signal sources or levels for TXEN1, TXEN2, TXD1, and TXD2. 9. Set up or monitor other signals as needed. 10.Once the above signals are set up, observe driver’s outputs and receiver’s inputs and outputs. 4. With power off, connect another load to VLDO and GND. 2 dc1733af DEMO MANUAL DC1733A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup Figure 2. Measuring Input or Output Ripple dc1733af 3 DEMO MANUAL DC1733A PARTS LIST ITEM QTY REFERENCE Required Circuit Components 1 1 C1 2 1 C5 3 2 C6, C11 4 1 C7 5 1 C12 6 3 C13, C15, C16 7 4 D1, D2, D3, D4 8 2 R9, R21 9 5 R10, R11, R14, R18, R25 10 1 R12 11 1 R13 12 5 R15, R16, R26, R27, R28 13 1 R17 14 1 R19 15 1 R20 16 1 R22 17 1 R23 18 1 R24 DC1733A-A Version Specific Components 1 1 C8 2 1 C9 3 0 D6(OPEN) 4 1 L1 5 1 U1 DC1733A-B Version Specific Components 1 1 C8 2 1 C9 3 1 D6 4 1 L1 5 1 U1 Additional Demo Board Circuit Components 1 0 C10(OPT) 2 0 C14(OPT) 3 0 D5(OPT) Hardware: For Demo Board Only 1 21 E1-E21 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., C0G, 10pF, 25V, 5% 0402 CAP., X7R, 100nF, 25V, 10% 0402 CAP., C0G, 470pF, 50V, 5% 0402 CAP., X7R, 1µF, 6.3V, 10% 0603 CAP., X7R, 4.7µF, 50V, 10% 1206 CAP., X5R, 0.1µF, 25V, 10% 0603 TVS, SMCJ36A SMC RES., CHIP, 10K, 1/16W, 1% 0402 RES., CHIP, 100K, 1/16W, 1% 0402 RES., CHIP, 42.2K, 1/16W, 1% 0402 RES., CHIP, 0Ω, 1/16W, 0402 RES., CHIP, 1K, 1/16W, 5% 0402 RES., CHIP, 1M, 1/16W, 1% 0402 RES., CHIP, 14K, 1/16W, 1% 0402 RES., CHIP, 4.42K, 1/16W, 1% 0402 RES., CHIP, 53.6K, 1/16W, 1% 0402 RES., CHIP, 10.2K, 1/16W, 1% 0402 RES., CHIP, 38.3K, 1/16W, 1% 0402 AVX, 04023A100JAT2A AVX, 04023C104KAT2A AVX, 04025A471JAT2A AVX, 06036C105KAT2A MURATA, GRM31CR71H475KA88L AVX, 06033D104KAT2A Diodes Inc., SMCJ36A VISHAY, CRCW040210K0FKED VISHAY, CRCW0402100KFKED VISHAY, CRCW040242K2FKED VISHAY, CRCW04020000Z0ED VISHAY, CRCW04021K00JKED VISHAY, CRCW04021M00FKED VISHAY, CRCW040214K0FKED VISHAY, CRCW04024K42FKED VISHAY, CRCW040253K6FKED VISHAY, CRCW040210K2FKED VISHAY, CRCW040238K3FKED CAP., X5R, 10µF, 6.3V, 10% 0805 CAP., X7R, 0.1µF, 10V, 10% 0402 DIODE, POWER-DI-123 INDUCTOR, 82µH IC., LT3669EUFD QFN 4X5, 29 PIN MURATA, GRM219R60J106KE19D TDK, C1005X7R1A104K CAP., X5R, 22µF, 6.3V, 10% 0805 CAP., X7R, 0.22µF, 10V, 10% 0402 DIODE, POWER-DI-123 INDUCTOR, 33µH IC., LT3669EUFD-2 QFN 4X5, 29 PIN MURATA, GRM21BR60J226M TDK, C1005X7R1A224K Diodes Inc., DFLS160-7 SUMIDA, CDRH50D28RNP-330MC LINEAR TECHNOLOGY CORPORATION, LT3669EUFD-2#PBF SUMIDA, CDRH4D22HPNP-820MC LINEAR TECH., LT3669EUFD#PBF CAP., 1206 CAP., 0402 DIODE, POWER-DI-123 TESTPOINT, TURRET, .094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0 2 7 JP1-JP7 3 PIN 0.079 SINGLE ROW HEADER SULLINS, NRPN031PAEN-RC 3 4 JP8-JP11 2X4, 0.079 DOUBLE ROW HEADER SULLINS, NRPN042PAEN-RC 4 11 xJP1-xJP11 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 5 1 J1 M12 CONNECTOR, 5 PIN BINDER, 09 3441 500 05 6 1 J2 CONNECTOR, OSTTV041150 On shore tech., OSTTV041150 7 1 J3 2X8, 0.079 DOUBLE ROW HEADER SULLINS, NRPN082PAEN-RC 8 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON) 4 dc1733af 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 J3 9 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 TXD2-J TXD1-J TXEN2-J DC1733A-B 5 0.15A I LDO 0.1A LT3669EUFD LT3669EUFD-2 DC1733A-A HEADER 2X8 2MM E20 E19 E18 TXEN1-J VERSION TABEL ASSY TYPE U1 * TXD2 TXD1 TXEN2 E17 5V 8 2 4 6 8 2 4 6 8 GND 1 3 5 5V 7 GND 1 3 5 5V 7 0.3A 0.1A I BUCK SYNC RST SC1 SC2 WAKE RXD1 TXEN1-J TXD1-J TXEN2-J 5V 3.3V 6 5 5V 7 TXD2-J 4 8 3 6 5 2 4 3 5V 7 GND 1 2 GND 1 C8 22uF 10uF E4 E3 E2 R10 100K R13 0 5V RXD1 RES GND 5V GND 0.22uF C9 0.1uF 4 OPEN DFLS160 D6 L1 SYNC 10pF 24 25 26 27 * SYNC SR ILIM CPOR RST SC2 SC1 RXD1 TXD2 TXD1 TXEN2 TXEN1 U1 3 3 E7 PAD EXPOSED WAKE WAKE EN/UVLO CQ1 Q2 L+ RT DIO FB_OUT DA SW BST BD LDO_IN FB_LDO LDO R21 10K 5V 12 10 9 11 22 13 21 14 15 16 17 18 20 19 * PAR 1 D6 3 * L1 C14 OPT C11 470pF 50V 2 R18 100K R17 1M D5 OPT RES L+ 50V 1206 R23 10.2K R22 53.6K JP7 EN/UVLO 2 DIO 2 C13 0.1uF VOUT 6.3V 0603 C7 1uF 6.3V 0603 2 C6 470pF 50V C12 4.7uF C10 OPT 1206 6.3V 0805 OPEN JP3 CQ1-2 38.3K R24 * * C9 C8 R20 4.42K R19 14K Figure 3. DC1733A Demo Circuit Schematic 82uH, CDRH4D22HPNP-820MC 33uH, CDRH50D28RNP-330MC 1. ALL RESISTORS ARE 0402 ALL CAPACITORS ARE 0402. 2 28 1 4 SC2 RXD1 8 6 7 5 SC1 C1 R14 100K SR 5V JP2 2 5V RST E1 R9 10K C5 100nF 5V R11 100K E13 ILIM JP1 SC1 R25 100K PAR OPEN 1 3 JP5 TXD1-2 PAR OPEN 1 3 JP6 TXEN1-2 R12 42.2K 2 5V R27 1K R26 1K R16 1K R15 1K NOTE: UNLESS OTHERWISE SPECIFIED SYNC RST SC2 JP11 TXD2 JP10 TXD1 JP9 TXEN2 JP8 TXEN1 2 2 1 3 4 1 3 3 WAKE GND 29 AGND 23 3 1 2 3 1 TXEN1 5 JP4 E11 SMCJ36A D2 1K R28 D1 E9 C15 0.1uF 6.3V 0603 CQ1 E10 D4 SMCJ36A E12 L-/GND C16 0.1uF 6.3V 0603 5V D3 L+ 7.5V - 40V Q2 LDOIN 3.3V V LDO J1 3 2 1 GND GND GND CQ1 4 1 E16 EN/UVLO CON-OSTTV041150 3 2 L+ Q2 L-/GND J2 1 * * 5V / I BUCK V BUCK GND 3.3V / I LDO 4 S1 5 S2 M12-MALE-5PIN E21 E8 E15 E6 E14 E5 1 A B C D DEMO MANUAL DC1733A SCHEMATIC DIAGRAM dc1733af 5 DEMO MANUAL DC1733A 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 6 dc1733af Linear Technology Corporation LT 0614 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014