DEMO MANUAL DC1902B LT4320 Ideal Diode Bridge Controller Description Demonstration circuit 1902B features the ideal diode bridge controller LT®4320 suitable for applications that require low to medium current AC to DC full-wave rectification or DC polarity correction and a small compact solution (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 DC1902B includes low RDS(ON) N-channel MOSFETs (10mΩ typical) to support low to medium 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 (D2) is also included and is recommended for electrically harsh conditions. Design files for this circuit board are available at http://www.linear.com/demo 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 DC1902B at Various Input Voltages DC INPUT VOLTAGE (V) DC OUTPUT VOLTAGE (V) DC LOAD CURRENT (A) EFFICIENCY (%) (TYPICAL) 12.046 11.977 3.500 99.43 20.045 19.972 3.500 99.64 40.025 39.952 3.500 99.82 dc1902bfa 1 DEMO MANUAL DC1902B 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 DC1902B 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 DC1902B output voltage across VOUT+ to VOUT–. The reading should be very close to the input voltage of the DC1902B. 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 (C2). Add additional CLOAD capacitance, if higher output load current is desired. With an oscilloscope in place of the output voltmeter, make sure the lowest point of the output voltage (droop) is above the minimum operating voltage specified in the LT4320 data sheet. Note: Maximum load current with an AC input should be limited to about 3A 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 60VDC 3.5A AC, 60Hz 12VACRMS 0.7A* AC, 60Hz 24VACRMS 1.5A* *Limited by demo board supplied C2. Figure 1. DC1902B Setup 2 dc1902bfa DEMO MANUAL DC1902B Thermal Plot Figure 2. Ideal Diode Bridge Using Four PSMN011-60MS vs Diode Bridge Using Four B360B Passing 3ADC (VIN1 Positive with Respect to VIN2) dc1902bfa 3 DEMO MANUAL DC1902B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP, X7S, 1µF, 100V, 10% 0805 TDK, C2012X7S2A105K 2 1 C2 CAP, ALUM, 680µF 63V, C-SANYO-12.5X35 PANASONIC, EEU-FR1J681L 3 1 U1 IC, LT4320IDD, DFN8DD LINEAR TECHNOLOGY, LT4320IDD#PBF 4 4 Q1 TO Q4 MOSFET, N-CH, 60V, LFPAK33 NXP, PSMN011-60MS Optional Circuit Components 1 1 D1 DIODE, TVS 400W, SMA-DIODE DIODES INC, SMAJ60A-13-F 2 0 D2 DIODE, SMBJ60CA OPT 3 4 E1 TO E4 TP, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0 4 1 J5 CONN, POWER JACK 2.1X5.5MM HI CUR SMD CUI INC, PJ-002A-SMT 5 1 LED1 LED, GREEN SMD ROHM, SML-010FTT86L 6 1 R1 RES, CHIP 3.9k, 5% 2512 VISHAY, CRCW25123K90JNEG 7 4 MH1 TO MH4 STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833 (SNAP ON) 4 dc1902bfa 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 VIN1 VIN2 5 1. ALL CAPACITORS ARE IN MICROFARADS, 0805. 4 IN2 IN1 BG2 1 2 3 CUSTOMER NOTICE Q3 PSMN011-60MS 1 8 U1 LT4320IDD 5 6 7 8 3 2 1 Q1 PSMN011-60MS 3 8 2 7 1 6 5 TG2 TG1 3 5 6 7 8 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 8 7 6 5 C1 1uF 100V 1 2 3 SCALE = NONE KAUGH H. KIM T. APPROVALS D1 SMAJ60A __ ECO 1 VOUT- VOUT+ DATE 09-29-14 DATE: LT4320IDD DEMO CIRCUIT 1902B 2 Monday, September 29, 2014 IC NO. 1 SHEET 1 OF 1 1 REV. COMPACT IDEAL DIODE BRIDGE FULL WAVE RECTIFIER N/A SIZE E4 E3 KAUGH H. APPROVED 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only VOUT- PANASONIC EEU-FR1J681L 63V + C2 680uF VOUT+ REBUILD WITH CHANGE DESCRIPTION REVISION HISTORY TECHNOLOGY LED1 GRN R1 3.9k 2512 REV 2 TITLE: SCHEMATIC AC INPUT = 1.5A DC INPUT = 3.5A 9 5 Q4 PSMN011-60MS BG1 EP OUTN OUTP 6 Q2 PSMN011-60MS 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. D2 SMBJ60A OPT NOTE: UNLESS OTHERWISE SPECIFIED VIN2 E2 J5 PJ-002AH-SMT 3 2 12VAC - 24VAC 9VDC - 60VDC 1 VIN1 E1 1 2 4 4 2 TG2 BG2 3 7 TG1 BG1 4 4 4 5 A B C D DEMO MANUAL DC1902B Schematic Diagram dc1902bfa 5 DEMO MANUAL DC1902B 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 dc1902bfa Linear Technology Corporation LT 1214 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013