DEMO MANUAL DC2306A LT3753 Active Clamp Forward Converter Description Demonstration circuit 2306A is an active clamp forward converter featuring the LT®3753. This circuit was designed to demonstrate the high level of performance and efficiency that can be attained with the LT3753. It operates at 100kHz and produces a regulated 54V, 1.5A output from a wide input voltage range of 10V to 54V, making it suitable for telecom, industrial, and other applications. The output voltage of this circuit is jumper selectable between 54V and 48V. The DC2306 circuit features soft-start which prevents output voltage overshoot during startup or when recovering from overload condition. Performance Summary SYMBOL PARAMETER VIN Input Supply Range The DC2306 also has precise overcurrent protection circuit that allows for continuous operation under short circuit conditions. The low power dissipation under short circuit conditions insures high reliability even during short circuits. Please refer to LT3753 data sheet for design details and applications information. Design files for this circuit board are available at http://www.linear.com/demo/DC2306A 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. Specifications are at TA = 25°C CONDITIONS MIN TYP 10 VOUT Output Voltage 53 IOUT Maximum Output Current, Continuous 1.5 fSW Switching (Clock) Frequency VOUT P-P Output Ripple VIN = 12V, IOUT = 1.5A (20MHz BW) IREG Output Regulation Line and Load (10VIN to 54VIN, 0A to 1.5AOUT) POUT /PIN Efficiency (See Figure 2) VIN =12V, IOUT = 1.5A 54 MAX UNITS 54 V 55 V A 100 kHz 40 mVP–P ±0.1 % 93 % dc2306af 1 DEMO MANUAL DC2306A Quick Start Procedure Demonstration circuit 2306A is easy to set up to evaluate the performance of the LT3753. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE: When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor as shown in Figure 1. 1.Set an input power supply that is capable of 10V to 54V to 10V. Then turn off the supply. 2.With power off, connect the supply to the input terminals +VIN and –VIN. a. Input voltages lower than 10V can keep the converter from turning on due to the undervoltage lockout feature of the LT3753. b.If efficiency measurements are desired, an ammeter capable of measuring 9Adc can be put in series with the input supply in order to measure the DC2306A’s input current. c. A voltmeter with a capability of measuring at least 54V can be placed across the input terminals in order to get an accurate input voltage measurement. 2 3.Turn on the power at the input. NOTE: Make sure that the input voltage does not exceed 100V. 4.Check for the proper output voltage of 54V. Turn off the power at the input. 5.Once the proper output voltages are established, connect a variable load capable of sinking 1.5A at 54V to the output terminals +VOUT and –VOUT. Set the current for 0A. a. If efficiency measurements are desired, an ammeter that is capable of handling 1.5Adc can be put in series with the output load in order to measure the DC2306A’s output current. b.A voltmeter can be placed across the output terminals in order to get an accurate output voltage measurement. 6.Turn on the power at the input. NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 7.Once the proper output voltage is again established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other desired parameters. dc2306af DEMO MANUAL DC2306A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup 100 95 PERCENTAGE (%) 90 85 80 75 70 VIN = 10V VIN = 12V VIN = 24V VIN = 36V VIN = 48V VIN = 54V 65 60 55 50 0 0.3 0.6 0.9 LOAD CURRENT(A) 1.2 1.5 DC2306A F02 Figure 2. Efficiency vs Load Current dc2306af 3 DEMO MANUAL DC2306A Quick Start Procedure 500mA/DIV 20mV/DIV 500mV/DIV 5µs/DIV DC2306A F03 Figure 3. Output Ripple at 12VIN and 1.5AOUT (20MHz BW) Figure 5. Thermal Map, Front Side at 12VIN and 1.5AOUT (TA = 25°C) 4 500µs/DIV DC2306A F04 Figure 4. Transient Response Waveform at 12VIN and 0.75AOUT to 1.5AOUT Figure 6. Thermal Map, Backside at 12VIN and 1.5AOUT (TA = 25°C) dc2306af DEMO MANUAL DC2306A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 8 CIN1-CIN6, CO1, CO2 CAP., X7S, 4.7µF, 100V, 10%, 1210 TDK, CGA6M3X7S2A475K 2 1 CIN7 CAP., ALUM, 56µF, 63V SUN ELEC., 63HVH56M 3 1 CSYS CAP., ALUM, 47µF, 63V SUN ELEC., 63HVH47M 4 1 CY1 CAP., X7R, 2200pF, 250V, 10%, 1812 MURATA, GA343QR7GD222KW01L 5 1 C1 CAP., X7R, 1µF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D 6 1 C2 CAP., X7R, 4.7µF, 25V, 10%, 0805 MURATA, GRM21BR61E475KA12L 7 1 C3 CAP., X7R, 22nF, 25V, 10%, 0603 MURATA, GRM188R71E223KA01D 8 1 C4 CAP., X7S, 1µF, 100V, 10%, 0805 TDK, C2012X7S2A105K 9 1 C5 CAP., X7R, 100pF, 50V, 10%, 0603 AVX, 06035C101KAT2A 10 1 C7 CAP., X7R, 2200pF, 50V, 10%, 0603 MURATA, GRM188R71H222KA01D 11 1 C8 CAP., U2J, 2200pF, 630V, 10%, 1206 MURATA, GRM31A7U2J222JW31D 12 1 C12 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D 13 1 C13 CAP., X5R, 2.2µF, 25V, 10%, 0603 TDK, C1608X5R1E225K080AB 14 1 C14 CAP., X7R, 0.22µF, 100V, 10%, 1206 TDK, C3216X7R2A224K115AA 15 1 C18 CAP., C0G, 4.7nF, 50V, 5%, 0603 MURATA, GRM1885C1H472JA01D 16 1 C21 CAP., NP0, 3900pF, 50V, 10%, 0603 MURATA, GRM1885C1H392JA01D 17 1 C22 CAP., X7R, 2.2pF, 50V, 10%, 0805 MURATA, GRM21BR71E225KA73L 18 1 D1 DIODE,SiC SCHOTTKY, DIODE, 600V, 4A, DPAK INFINEON, IDD04SG60C 19 1 D2 DIODE, 600V, 10A, TLM364 CENTRAL SEMI., CTLHR10-06 20 1 D3 DIODE, 600V, 1A, SOD123F CENTRAL SEMI., CMMR1U-06 21 1 D4 DIODE, ZENER, 10V, SOD-123 CENTRAL SEMI., CMHZ4697 22 1 D5 DIODE, HIGH-SPEED DIODE, SOD-523 NXP/PHILLIPS SEMI., BAS516 23 1 L1 INDUCTOR, 330µH CHAMPS, PQA2050-330 24 1 Q1 MOSFET, N-CH, 100V, PG-TDSON-8 INFINEON, BSC040N10NS5 25 1 Q3 MOSFET, P-CH, 100V, 4.2A, DPAK INFINEON, SPD04P10PL G 26 1 RCS1 RES., CHIP, 0.004Ω, 1W, 1%, 0815 SUSUMU, RL3720WT-R004-F 27 1 R1 RES., CHIP, 82.5k, 0.1W, 1%, 0603 VISHAY, CRCW060382K5FKEA 28 1 R2 RES., CHIP, 100k, 0.1W, 1%, 0603 VISHAY, CRCW0603100KFKEA 29 2 R4, R17 RES., CHIP, 0Ω, 0.1W, 1%, 0603 VISHAY, CRCW06030000Z0EA 30 1 R5 RES., CHIP, 44.2k, 0.1W, 1%, 0603 VISHAY, CRCW060344K2FKEA 31 1 R6 RES., CHIP, 187k, 0.1W, 1%, 0603 VISHAY, CRCW0603187KFKEA 32 1 R7 RES., CHIP, 2.55k, 0.1W, 1%, 0603 VISHAY, CRCW06032K55FKEA 33 1 R8 RES., CHIP, 12.7k, 0.1W, 1%, 0603 VISHAY, CRCW060312K7FKEA 34 1 R9 RES., CHIP, 100k, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA 35 3 R10, R11, R23 RES., CHIP, 100Ω, 0.1W, 1%, 0603 VISHAY, CRCW0603100RFKEA 36 2 R12, R13 RES., CHIP, 124k, 1W, 1%, 2512 VISHAY, CRCW2512124KFKEG 37 1 R15 RES., CHIP, 1.5k, 0.1W, 5%, 0603 VISHAY, CRCW06031K50JNEA 38 1 R16 RES., CHIP, 56.2k, 0.1W, 1%, 0603 VISHAY, CRCW060356K2FKEA 39 1 R18 RES., CHIP, 100k, 0.1W, 5%, 0603 VISHAY, CRCW0603100KJNEA 40 1 R19 RES., CHIP, 59k, 0.1W, 1%, 0603 VISHAY, CRCW060359K0FKEA 41 1 R20 RES., CHIP, 196k, 0.1W, 1%, 0603 VISHAY, CRCW0603196KFKEA dc2306af 5 DEMO MANUAL DC2306A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 42 1 R21 RES., CHIP, 3.01k, 0.1W, 1%, 0603 VISHAY, CRCW06033K01FKEA 43 1 R22 RES., CHIP, 2k, 0.1W, 1%, 0603 VISHAY, CRCW06032K00FKEA 44 1 R24 RES., CHIP, 340Ω, 0.1W, 1%, 0603 VISHAY, CRCW0603340RFKEA 45 1 R25 RES., CHIP, 10k, 0.1W, 1%, 0603 VISHAY, CRCW060310K0FKEA 46 1 R27 RES., CHIP, 1.5M, 0.1W, 1%, 0603 VISHAY, CRCW06031M50FKEA 47 1 R28 RES., CHIP, 9.53k, 0.1W, 1%, 0603 VISHAY, CRCW06039K53FKEA 48 1 R29 RES., CHIP, 10k, 0.25W, 1%, 1206 VISHAY, CRCW120610K0FKEA 49 1 T1 TRANSFORMER CHAMPS, P26R2-0322-18R0 50 1 U1 I.C., LT3753EFE#TRPBF, TSSOP-38(31) LINEAR TECH., LT3753EFE#TRPBF 51 1 U2 I.C., PS2801C-1-P-A NEC, PS2801C-1-P-A 52 1 U3 I.C. LT1431CS8, SO8 LINEAR TECH., LT1431CS8#TRPBF Additional Demo Board Circuit Components 1 0 CO3 (OPT) CAP., 1210 2 0 C6 (OPT) CAP., 0603 3 0 C15 (OPT) CAP., X7R, 0.47µF, 100V, 10%, 1206 4 0 C20 (OPT) CAP., 0603 5 0 R3 (OPT) RES., 0603 6 0 R26 (OPT) RES., CHIP, 200, 1/2W, 1%, 1210 Hardware: For Demo Board Only 6 1 2 E1, E2 TESTPOINT, TURRET, .061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0 2 4 E3-E6 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0 3 2 J1, J2 BANANA JACK KEYSTONE, 575-4 4 1 JP1 CONN., HEADER, 1×3, 2mm WURTH ELEKTRONIK, 620 003 111 21 5 1 XJP1 SHUNT, 2mm WURTH ELEKTRONIK, 608 002 134 21 6 4 MH1-MH4 STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON) 7 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2306A 8 2 STENCIL (TOP & BOTTOM) STENCIL DC2306A dc2306af 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 -VIN +VIN 10V - 54V E4 J2 J1 E3 GND SYNC + 5 R22 2K C6 4.7uF 100V 1210 44.2K 11 R5 13 12 8 C2 4.7uF 25V 0805 INTVCC SYNC TBLNK TOS TAS TAO IVSEC OVLO UVLO_VSEC 100KHz R1 82.5K 250V 1812 CY1 2200pF 26 6 100K 14 INTVCC R2 187K R6 10 2.55K R7 9 12.7K 0805 100K C4 1uF 100V 0805 R8 OPT R9 R17 0 EVAL1: EFE PACKAGE (FE38 (31) ) BOARD SIZE: 4.70" BY 2.90" 4 LT3753EFE U1 COMP SOUT AOUT 22nF 1uF 4 NC NC ISENSEN C3 SGND OC OUT ISENSEP C1 NOTE: UNLESS OTHERWISE SPECIFIED: ALL RESISTORS & CAPACITORS ARE 0603 . ALL RESISTORS ARE 1% MULTILAYER RESISTORS. ALL CERAMIC CAPACITORS ARE X7R E1 E2 CIN7 56uF 63V 63HVH56M CIN1 CIN2 CIN3 CIN4 CIN5 CIN6 28 D 37 VIN 34 NC 3 SS1 7 RT 36 NC 1 TEST2 2 TEST1 GND 18 38 39 NC 17 SS2 PGND PGND FB 4 PGND 19 5 5 30 32 20 16 15 21 22 24 100pF C5 0 OPT R18 100K C7 2.2nF R21 3.01K R4 R3 R19 59K INTVCC R11 100 R10 100 C12 0.1uF C13 2.2uF R23 100 Q1 BSC040N10NS5 3 3 R24 340 3 4 C22 2.2uF 25V 0805 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 CO1 4.7uF 100V 1210 DATE: N/A SIZE 5 GND-S TECHNOLOGY 6 GND-F RMID RTOP REF COMP 2 CO3 OPT 1210 COLLECTOR V+ 3 CO2 4.7uF 100V 1210 +VO1 R20 196K +VO1 E6 CSYS 47uF 63V 63HVH47M R28 9.53K R27 1.5M C20 OPT -VOUT JP1 +VOUT +54V / 1.5A 54V 48V 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 7 4 8 + E5 1 1 SHEET LT3753EFE DEMO CIRCUIT 2306A Thursday, July 23, 2015 IC NO. 1 OF 1 4 REV. 10-54VIN, 54VOUT ACTIVE CLAMP FORWARD CONVERTER TITLE: SCHEMATIC U3 LT1431CS8 C21 3.9nF R16 56.2K R13 124K 2512 D4 CMHZ4697 R29 10K 1206 +VO1 CUSTOMER NOTICE C18 4.7nF R12 124K 2512 C8 2.2nF 630V 1206 D3 CMMR1U-06 L1 330uH PQA2050-330 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 1 R15 1.5K Q3 SPD04P10PL G U2 PS2801-1 D5 BAS516 0.004 0815 R26 200 OPT 1210 C15 0.47uF OPT 1206 100V CTLHR10-06 D2 D1 IDD04SG60C C14 220nF 1206 100V 13 6 RCS1 9 2 R25 10K T1 P26R2-0322-18R0 2 A B C D DEMO MANUAL DC2306A Schematic Diagram dc2306af 7 DEMO MANUAL DC2306A 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 dc2306af 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