DEMO MANUAL DC2015A LT8310/LT8311 48VIN to 12V/12A Forward Converter with Synchronous Rectification DESCRIPTION Demonstration circuit 2015A is a resonant reset forward converter with synchronous rectification featuring the LT®8310/LT8311 chipset. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using these parts. It operates at 240kHz and produces a regulated 12V, 12A output from an input voltage range of 36V to 72V: suitable for telecom, industrial, and other applications. It has an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94%. The DC2015A circuit features soft-start which prevents output voltage overshoot on startup or when recovering from overload condition. The DC2015A takes advantage of the LT8310’s input undervoltage and overvoltage protection to shutdown the system when the input voltage is outside of the set limits. The DC2015A also has precise overcurrent protection that allows for continuous operation under short-circuit conditions. The low power dissipation under a short-circuit condition insures high reliability even during a prolonged output voltage short-circuit. The LT8310/LT8311 data sheets give a complete description of the parts, operation and application information. The data sheets must be read in conjunction with this quick start guide for demo circuit 2015A. Design files for this circuit board are available at http://www.linear.com/demo/DC2015A 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 Specifications are at TA = 25°C SYMBOL PARAMETER VIN Input Supply Range VOUT Output Voltage IOUT Maximum Output Current, Continuous fSW Switching (Clock) Frequency VOUT(P-P) Output Ripple VIN = 48V, IOUT = 12A (20MHz BW) IREG Output Regulation Line and Load (36VIN to 72VIN, 0AOUT to 12AOUT) POUT/PIN CONDITIONS MIN TYP 36 11.7 200LFM Airflow Efficiency (See Figure 3) VIN = 48V, IOUT = 12A Isolation Basic MAX 72 12.0 12 12.3 UNITS V V A 240 kHz 80 mVP-P ±0.1 94 1500 % % VDC dc2015af 1 DEMO MANUAL DC2015A QUICK START PROCEDURE Demonstration circuit 2015A is easy to set up to evaluate the performance of the LT8310/LT8311. 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 2. 1.Set an input power supply that is capable of 36V to 72V. Then turn off the supply. 2.Direct an airflow of 200LFM across the unit for sustained operation at full load. 3.With power off, connect the supply to the input terminals +VIN and –VIN. a. Input voltages lower than 36V can keep the converter from turning on due to the undervoltage lockout feature of the LT8310/LT8311. b.If efficiency measurements are desired, an ammeter capable of measuring 10ADC can be put in series with the input supply in order to measure the DC2015A’s input current. c. A voltmeter with a capability of measuring at least 72V can be placed across the input terminals in order to get an accurate input voltage measurement. 4.Turn on the power at the input. Note. Make sure that the input voltage does not exceed 100V. 5.Check for the proper output voltage of 12V. Turn off the power at the input. 6.Once the proper output voltages are established, connect a variable load capable of sinking 12A at 12V to the output terminals +VOUT and –VOUT. Set the current for 0A. a. If efficiency measurements are desired, an ammeter or a resistor shunt that is capable of handling 12ADC can be put in series with the output load in order to measure the DC2015A’s output current. b.A voltmeter with a capability of measuring at least 12V can be placed across the output terminals in order to get an accurate output voltage measurement. 7.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. 8.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. dc2015af 2 DEMO MANUAL DC2015A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup INPUT OR OUTPUT CAPACITOR Figure 2. Proper Scope Probe Placement for Measuring Input/Output Ripple 100 98 EFFICIENCY (%) 96 94 92 90 88 86 84 48VIN 36VIN 72VIN 82 80 0 1 2 3 4 5 6 7 8 9 10 11 12 LOAD CURRENT (A) dc2015a F03 Figure 3. Typical Efficiency Curve dc2015af 3 DEMO MANUAL DC2015A QUICK START PROCEDURE 50mV/DIV 2µs/DIV Figure 4. Output Ripple at 48VIN and 12AOUT (20MHz BW) 5A/DIV 200mV/DIV 200µs/DIV Figure 5. Load Transient Response Waveform at 48VIN and 6AOUT to 12AOUT dc2015af 4 DEMO MANUAL DC2015A QUICK START PROCEDURE Figure 6. Thermal Map, Frontside at 48VIN and 12AOUT (TA = 25°C, 200LFM) Figure 7. Thermal Map, Backside at 48VIN and 12OUT (TA = 25°C, 200LFM) dc2015af 5 DEMO MANUAL DC2015A PARTS LIST ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER/PART # Cap., X7R 4700pF 250V 20% 1812 Murata GA343DR7GD472KW01L REQUIRED CIRCUIT COMPONENTS 1 1 C1 2 3 C2, C4, C23 3 1 C3 4 3 C5, C6, C24 Cap., X7S 4.7µF 100V 10% 1210 TDK C3225X7S2A475K Cap., Alum 10µF 100V 20% Sun Elect. Ind. Corp. 100HVH10M Cap., X5R 47µF 16V 20% 1210 Taiyo Yuden EMK325BJ476MM 5 1 C7 Cap., U2J 390pF 250V 5% 0805 Murata GRM21A7U2E391JW31D 6 1 C9 Cap., Alum 470µF 16V 20% Sun Elect. Ind. Corp. 16SVPE470M 7 2 C10, C14 Cap., X7R 22nF 25V 10% 0603 AVX 06033C223KAT1A 8 1 C11 Cap., X7S 1µF 100V 10% 0805 TDK C2012X7S2A105K 9 1 C12 Cap., X7R 0.01µF 25V 10% 0603 AVX 06033C103KAT2A 10 3 C13, C17, C19 Cap., X5R 4.7µF 16V 20% 0805 TDK C2012X5R1C475M 11 1 C15 Cap., NPO 100pF 25V 5% 0603 AVX 06033A101JAT2A 12 1 C16 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A 13 1 C18 Cap., X7R 3.9nF 25V 20% 0603 AVX 06033C392MAT2A 14 1 C20 Cap., NPO 220pF 25V 5% 0603 AVX 06033A221JAT1A 15 1 C25 Cap., U2J 3.9nF 250V 5% 0805 Murata GRM21B7U2E392JW32L 16 1 C26 Cap., X5R 1µF 25V 20% 0603 AVX 06033D105MAT2A 17 1 D2 Diode, 1A/200V SOD-123 Central Semi. CMMR1U-02 18 1 ISO1 Opto Iso., 2.5kV TRANS 4SOIC PbF NEC PS2801C-1-P-A 19 1 L1 Inductor, 8µH Champs Tech. PQA2050-08-LTC 20 1 L3 Inductor, 1µH Coilcraft XAL6030-102MEC 21 1 Q1 MOSFET N-Channel, 200V/36A SuperSO8 Infineon BSC320N20NS3G 22 1 Q2 MOSFET, Single N-Chan. 100V/60A POWER-56 Fairchild Semi. FDMS86101 23 1 Q3 MOSFET N-Channel, 75V/100A SuperSO8 Infineon BSC042NE7NS3G 24 1 R1 Res., Chip 86.6k 0.10W 1% 0603 Vishay CRCW060386K6FKEA 25 1 R3 Res., Chip 100k 0.10W 1% 0603 Vishay CRCW0603100KFKEA 26 3 R4, R14, R36 Res., Chip 10k 0.10W 5% 0603 Vishay CRCW060310K0JNEA 27 1 R5 Res., Chip 11.3k 0.10W 1% 0603 Vishay CRCW060311K3FKEA 28 1 R6 Res., Chip 1.74k 0.10W 1% 0603 Vishay CRCW06031K74FKEA 29 4 R7, R17, R34, R35 Res/Jumper, Chip 0Ω 0.25W 5A 0603 Vishay CRCW06030000Z0EA 30 1 R8 Res., Chip 1.43k 0.10W 1% 0603 Vishay CRCW06031K43FKEA 31 1 R10 Res., Chip 10.0Ω 0.10W 1% 0603 Vishay CRCW060310R0FKEA 32 1 R11 Res., RL Vert. 0.010Ω 1W 1% 0815 SSM Thin Film Tech. RL3720WT-R010-F 33 2 R13, R38 Res., Chip 4.02k 0.10W 1% 0603 Vishay CRCW06034K02FKEA 34 1 R16 Res., Chip 3.32k 0.10W 1% 0603 Vishay CRCW06033K32FKEA 35 1 R18 Res., Chip 113k 0.10W 1% 0603 Vishay CRCW0603113KFKEA 36 1 R19 Res., Chip 20.0k 0.10W 1% 0603 Vishay CRCW060320K0FKEA 37 1 R23 Res/Jumper, Chip 0Ω 0.33W 6A Vishay CRCW08050000ZOEA 38 1 R26 Res., Chip 41.2k 0.10W 1% 0603 Vishay CRCW060341K2FKEA 39 1 R27 Res., Chip 100k 0.10W 5% 0603 Vishay CRCW0603100KJNEA 40 1 R28 Res., Chip 178Ω 0.10W 1% 0603 Vishay CRCW0603178RFKEA 41 1 R29 Res., Chip 499k 0.10W 1% 0603 Vishay CRCW0603499KFKEA dc2015af 6 DEMO MANUAL DC2015A PARTS LIST ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER/PART # 42 1 R30 Res., Chip 560Ω 0.10W 5% 0603 Vishay CRCW0603560RJNEA 43 44 1 R32 Res., Chip 178Ω 0.125W 1% 0805 Vishay CRCW0805178RFKTA 1 R33 Res., Chip 20k 0.25W 5% 1206 Vishay CRCW120620K0JNED 45 1 R37 Res., Chip 499Ω 0.10W 1% 0603 Vishay CRCW0603499RFKEA 46 1 R39 Res., Chip 61.9k 0.10W 1% 0603 Vishay CRCW060361K9FKEA 47 1 T1 Transformer, 8:4 / (w/4T Pri. Aux) Pulse PA0423 48 1 T2 Transformer, 1.25:1 Pulse PA3493NL 49 1 U1 I.C., Converter Controller TSSOP20-FE20(16)/CB Linear Tech. Corp. LT8310EFE#PBF 50 1 U2 I.C., Converter Controller TSSOP20-FE20(16)/CB Linear Tech. Corp. LT8311EFE#PBF 51 1 FAB, 2015A_Rev3.pcb Demo Circuit 2015A ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS 1 0 C27,C28 2 0 D1 Schottky Diode SMA Cap., 0603 3 0 D3 Diode, Common Cathode SOT-23 Central Semi. Corp. CMSD2838 Inductor Coilcraft LPS4414 series 4 0 L2 5 0 R9, R12 Res., 0805 6 0 R21, R22 Res., 0603 HARDWARE-FOR DEMO BOARD ONLY 1 8 E1, E2, E3, E4, E5, E6, E7, E8 2 4 MH1-MH4 3 2 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0 Standoff, Nylon 0.25" Keystone, 8831 (Snap-On) Stencil (Top & Bottom) Stencil DC2015A dc2015af 7 8 A B C D SYNC ‐VIN +VIN 36V to 72V R14 10k E5 E3 E1 C15 100pF GND 100V + 10µF C3 Coilcraft E VIN R19 20.0k 1% C4 4.7µF 100V 1210 L3 1µH XAL6030‐102MEC E R39 61.9k 1% C2 4.7µF 100V 1210 R36 10k R27 100k SS FBX VC R38 4.02k 1% R37 499 1% C26 1µF GATE VIN NC 21 GND SOUT INTVCC RDVIN SENSE C18 3.9nF 5 6 INTVcc1 R26 41.2k 1% DFLT RT SYNC OVLO UVLO U1 LT8310EFE#PBF C16 0.1µF 8 10 9 7 3 1 R1 86.6k 1% INTVcc1 R8 1.43k 1% R6 1.74k 1% C23 4.7µF 100V 1210 11 15 16 13 14 18 20 D D R10 INTVcc1 GND C17 4.7µF 16V 0805 R18 113k 1% 10.0 1% C12 0.01µF C11 1µF 100V 0805 GND R11 0.010 1% 0815 Q1 3 1 3 4 T2 PA3493NL ISO1 PS2801C‐1‐P‐A GND 220pF C20 C7 390pF 250V Murata 0805 6 1 5 T1 PA0423 2 SGND 2 1 4 6 11 7 C1 4700pF 250V Murata 1812 CSW C R30 560 CSW Q3 BSC042NE7NS3G C R32 178 1% 0805 178 1% R28 CSW Q2 FDMS86101 SGND SGND 20 16 5 3 16V 0805 C13 4.7µF R33 20k 1206 CSP CG FG FSW CSW SGND 1 2 8µH Champs Tech. PQA2050‐08‐LTC 1 L1 CMMR1U‐02 D2 18 CSN VIN 7 SS 14 22nF C10 SGND PGOOD 13 R29 499k 1% 12 TIMER B C19 4.7µF 16V 0805 6 INTVcc INTVCC SGND 21 GND SYNC OPTO PMODE COMP FB 15 9 8 10 11 R3 100k 1% PGOOD E8 R4 10k LT8311EFE#PBF U2 C25 3.9nF 250V Murata 0805 B C14 4.02k 1% R16 3.32k 1% INTVcc 22nF R5 11.3k 1% R13 SGND SGND C5 47µF 16V 1210 C6 47µF 16V 1210 C24 47µF 16V 1210 A A E2 E6 E7 E4 C9 + 470µF 16V VOUT ‐VOUT +VOUT 12V / 12A A B C D DEMO MANUAL DC2015A SIMPLE SCHEMATIC DIAGRAM dc2015af 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 SYNC ‐VIN +VIN 36V to 72V R14 10k E5 E3 E1 C15 100pF GND 100V C3 + 10µF Coilcraft E VIN R19 20.0k 1% C4 4.7µF 100V 1210 L3 1µH XAL6030‐102MEC E R39 61.9k 1% C2 4.7µF 100V 1210 R36 10k R27 100k SS FBX VC R38 4.02k 1% R37 499 1% C26 1µF GATE VIN NC 21 GND SOUT INTVCC RDVIN SENSE C18 3.9nF 5 6 INTVcc1 R26 41.2k 1% DFLT RT SYNC OVLO UVLO U1 LT8310EFE#PBF C16 0.1µF 8 10 9 7 3 1 R1 86.6k 1% INTVcc1 R8 1.43k 1% R6 1.74k 1% C23 4.7µF 100V 1210 11 15 16 13 14 18 20 D D R10 INTVcc1 GND (Opt) LPS4414 C17 4.7µF 16V 0805 3 R11 0.010 1% 0815 Q1 GND L2 R18 113k 1% 10.0 1% C12 0.01µF 0 Ohm R7 C11 1µF 100V 0805 C20 GND 1 2 3 1 3 4 T2 PA3493NL ISO1 PS2801C‐1‐P‐A GND 220pF (Opt) SOT‐23 D3 C7 390pF 250V Murata 0805 GND 6 1 5 T1 PA0423 2 SGND 2 1 4 6 11 7 C1 4700pF 250V Murata 1812 FSW CSW C R30 560 R23 0 Ohm CSW SGND D2 2 (Opt) 0805 0 Ohm R12 (Opt) 0805 R35 R9 0 Ohm R34 R32 178 1% R28 (Opt) 178 1% 0805 R22 CSW C28 (Opt) 20 16 5 3 16V 0805 C13 4.7µF R33 20k 1206 CSP CG FG FSW CSW SGND 1 8µH Champs Tech. PQA2050‐08‐LTC 1 L1 CMMR1U‐02 Q2 FDMS86101 SGND CSW Q3 BSC042NE7NS3G C 18 CSN VIN 7 SS 14 22nF C10 SGND PGOOD 13 R29 499k 1% 12 TIMER B C19 4.7µF 16V 0805 6 INTVcc INTVCC SGND 21 GND SYNC OPTO PMODE COMP FB 15 9 8 10 11 R3 100k 1% PGOOD E8 R4 10k LT8311EFE#PBF U2 C25 3.9nF 250V Murata 0805 B 22nF C14 SGND SGND R16 3.32k 1% SGND C6 47µF 16V 1210 R21 (Opt) R17 0 Ohm INTVcc 4.02k 1% 11.3k 1% R13 R5 C27 (Opt) C5 47µF 16V 1210 C24 47µF 16V 1210 A A D1 (Opt) SMA E2 E6 E7 E4 C9 + 470µF 16V VOUT ‐VOUT +VOUT 12V / 12A A B C D DEMO MANUAL DC2015A FULL SCHEMATIC DIAGRAM dc2015af 9 DEMO MANUAL DC2015A 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 dc2015af 10 Linear Technology Corporation LT 0914 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014