DEMO MANUAL DC1823B LT4320 Ideal Diode Bridge Controller Description Demonstration circuit 1823B features the ideal diode bridge controller LT®4320 suitable for applications that require high current AC to DC full-wave rectification or DC polarity correction (see Table 2). The LT4320 drives four N-channel MOSFETs to perform full-wave rectification functionally similar to a diode bridge but with much lower power dissipation. This topology eases thermal design, and increases usable output voltage. In addition, an all N-channel topology has benefits over a P-channel topology such as a wider selection of MOSFETs, lower cost, lower RDS(ON), and smaller footprint. Only a few essential components are required to operate the LT4320 as an ideal diode bridge: four N-channel MOSFETs, a bypass ceramic capacitor, and an AC smoothing capacitor (CLOAD). The DC1823B includes four very low RDS(ON) N-channel MOSFETs (2.5mΩ typical) to support high current applications. When an AC voltage source is used, the onboard CLOAD (C2) capacitor allows for up to 1.5A of average output current. Add additional CLOAD capacitance to support higher current AC applications. A unidirectional TVS (D1) is included to protect the application from brief overvoltage events up to the part rating. A footprint for bidirectional TVS (D3) is also included and is recommended for electrically harsh conditions. Design files for this circuit board are available at http://www.linear.com/demo/DC1823B 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 Table 1. DC Efficiency of the DC1823B at Various Load Currents DC INPUT VOLTAGE (V) DC OUTPUT VOLTAGE (V) DC LOAD CURRENT (A) EFFICIENCY (%) (TYPICAL) 20.004 19.966 10.008 99.81 20.005 19.906 20.013 99.51 20.006 19.825 30.012 99.10 dc1823bfb 1 DEMO MANUAL DC1823B Quick Start Procedure 1.Connect a DC or AC power supply to VIN1 and VIN2 in any polarity as shown in Figure 1. Make sure the output voltage of the DC or AC power supply is within the input voltage range of the DC1823B as shown in Table 2. 2.Connect a load and a voltmeter across VOUT+ to VOUT– as shown in Figure 1. 3.For a DC input, raise the output voltage of the DC power supply to the desired level. Check the DC1823B output voltage across VOUT+ to VOUT–. The reading should be very close to the input voltage of the DC1823B. 4.For an AC input, raise the output voltage of the AC power supply to the desired level. Make sure the load current is within the current limits as shown in Table 2 with the demo board supplied CLOAD. Add additional CLOAD capacitance, if higher output load current is desired. Refer to the LT4320 data sheet for guidance on selecting CLOAD. With an oscilloscope in place of the output voltmeter, make sure the lowest point of the output voltage (droop) is above minimum operating voltage specified in the LT4320 data sheet. Note: Maximum load current with an AC input should be limited to about 17A due to MOSFET and PCB limitations. Table 2. Maximum Load Current per Input Voltage and Type of Voltage Source VOLTAGE SOURCE INPUT VOLTAGE MAXIMUM LOAD CURRENT DC 9VDC TO 40VDC 30A AC 12VACRMS 0.7A* AC 24VACRMS 1.5A* *Limited by demo board supplied CLOAD. Figure 1. DC1823B Setup 2 dc1823bfb DEMO MANUAL DC1823B Thermal Plots Figure 2. Top View, MOSFET Q2 and Q4 Passing 30ADC (VIN1 Positive with Respect to VIN2) Figure 3. Bottom View, MOSFET Q2 and Q4 Passing 30ADC (VIN1 Positive with Respect to VIN2) Figure 4. Top View, MOSFET Q1 and Q3 Passing 30ADC (VIN2 Positive with Respect to VIN1) Figure 5. Bottom View, MOSFET Q1 and Q3 Passing 30ADC (VIN2 Positive with Respect to VIN1) dc1823bfb 3 DEMO MANUAL DC1823B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP, X7S, 1µF, 100V, 0805 TDK, C2012X7S2A105K 2 1 C2 CAP, ALUM, 560µF, 50V, PANASONIC, EEU-FM1H561 3 4 Q1, Q2, Q3, Q4 MOSFET, BSC031N06NS3 G SO8-POWERPAK INFINEON, BSC031N06NS3 G 4 1 U1 IC, LT4320IDD, DFN8DD LINEAR TECHNOLOGY, LT4320IDD Optional Circuit Components 1 1 D1 DIODE, TVS UNIDIRECT 400W 45V SMA DIODES, SMAJ45A-13-F 2 1 D2 LED, GREEN, LED ROHM-SML-01 ROHM, SML-012P8TT86 3 0 D3 DIODE, OPT SMBJ45CA SMB-DIODE DIODES, OPT SMBJ45CA-13-F 4 4 E1 TO E4 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0 5 0 E5 TO E9 PAD SMT PAD SMT 6 4 J1 TO J4 CONN, BANANA JACK, KEYSTONE 575-4 7 1 J5 CONN, JACK PJ-002AH-SMT CUI INC PJ-002AH-SMT 8 1 R1 RES, CHIP 3k, 5% 2512 VISHAY, CRCW25123K00JNEG 9 4 MH1 TO MH4 STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833 (SNAP ON) 10 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT, DC1823B Note: The DC1823B uses a different green LED D2 as the one on DC1823A was obsoleted. 4 dc1823bfb 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 E1 3 2 1 5 1. ALL RESISTORS ARE IN OHMS ALL CAPACITORS ARE IN MICROFARADS 0805. E2 D3 OPT SMBJ45CA NOTE: UNLESS OTHERWISE SPECIFIED VIN2 VIN2 J2 PJ-002AH-SMT CUI INC. J5 12VAC-24VAC, 9VDC-40VDC VIN1 VIN1 J1 1 2 D Q3 OUTN OUTN OUTP E5 TG1 CUSTOMER NOTICE 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 1 2 3 C1 1uF 100V X5R SCALE = NONE KAUGH H. KIM T. APPROVALS BSC031N06NS3 G 5 6 7 8 Q4 E7 BG1 9 5 6 E9 OUT Q2 BSC031N06NS3 G 3 8 2 7 1 6 5 E6 BG2 1 2 3 IN2 IN1 E8 BSC031N06NS3 G 5 6 7 8 1 8 U1 LT4320 TG2 Q1 BSC031N06NS3 G 3 8 2 7 1 6 5 3 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 4 3 4 4 2 TG2 7 TG1 BG1 4 BG2 4 4 1 D1 SMAJ45A __ ECO 1 E4 J4 VOUT- VOUT- VOUT+ VOUT+ 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C2 560uF 50V PANASONIC E3 DATE 10-05-15 DATE: LT4320IDD DEMO CIRCUIT 1823B 2 Monday, October 05, 2015 IC NO. 1 SHEET 1 1 OF 1 REV. IDEAL DIODE BRIDGE FULL WAVE RECTIFIER N/A SIZE + KAUGH H. J3 APPROVED DESCRIPTION 1 PRODUCTION REVISION HISTORY TECHNOLOGY AB ON D2 GREEN R1 3K 2512 REV 2 TITLE: SCHEMATIC 2 1 2 5 A B C D DEMO MANUAL DC1823B Schematic Diagram dc1823bfb 5 DEMO MANUAL DC1823B 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 dc1823bfb Linear Technology Corporation LT 1215 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2012