DEMO MANUAL DC1739A-B LTC3765/LTC3766 150W High Efficiency Active Clamp Forward Converter DESCRIPTION Demonstration circuit 1739A-B is a 150W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766. This circuit demonstrates a high level of performance, efficiency, and small solution size attainable using these parts in an active-clamp-reset forward converter power supply. It operates at 240kHz and produces a regulated 12V, 12.5A output from an input voltage range of 18V to 72V, making it well suited for telecom, industrial, and other applications. It has an eighth-brick footprint size of 0.90" × 2.3". PERFORMANCE SUMMARY Synchronous rectification helps to attain efficiency exceeding 94%. Secondary-side control eliminates complex opto-coupler feedback, providing fast transient response with minimum output capacitance. The proprietary Direct Flux Limit™ scheme guarantees no transformer saturation. For other output requirements, see the LTC3766 data sheet or contact the LTC factory. 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 and Direct Flux Limit is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) SYMBOL PARAMETER CONDITIONS VIN Input Supply Range VOUT Output Voltage IOUT Output Current Range, Continuous 200LFM IOUT Output Current , Peak 200LFM fSW Switching (Clock) Frequency MIN TYP 18 MAX 72 12.0 0 UNITS V V 11 12.5 A A 240 kHz mVP–P VOUT P-P Output Ripple VIN = 48V, IOUT = 12A (20MHz BW) 60 IREG Output Regulation Line and Load (18-72VIN, 0-12AOUT) ±0.08 % POUT/PIN Efficiency (see Figure 3) VIN = 48V, IOUT = 10A 93.6 % Isolation Basic Approximate Size Component Area × Top Component Height 1500 2.3 × 0.9 × 0.47 VDC Inches OPERATING PRINCIPLES The LTC3765 active clamp forward controller and gate driver is used on the primary and provides start-up, gate drive, and protection functions. Once start-up is accomplished, the LTC3766 high efficiency, secondary-side synchronous forward controller takes over, and provides the LTC3765 with timing information and bias power through a small pulse transformer. When input voltage is applied, the LTC3765 commences soft-start of the output voltage. When the secondary bias source reaches the undervoltage threshold, the LTC3766 comes alive and takes control by sending encoded PWM gate pulses to the LTC3765 through T3. These pulses also provide primary bias power efficiently over a wide input voltage range. dc1739afb 1 DEMO MANUAL DC1739A-B OPERATING PRINCIPLES The transition from primary to secondary control occurs at some fraction of the nominal output voltage. From then on, operation and design is simplified to that of a simple buck converter. Secondary control eliminates delays, tames large-signal overshoot, and reduces output capacitance needed to meet transient response requirements. An optional LC filter stage on the input lowers RMS input current. The filter must have output impedance that is less than the converter input impedance to assure stability. This may require a damping impedance. (See Linear Technology Application Note AN19 for a discussion of input filter stability.) A source with a 300mΩ or higher ESR at the filter resonant frequency (~100kHz) is one way of providing damping for the filter elements provided on the DC1739A-B. For bench testing, an electrolytic capacitor has been added at the input terminals to provide suitable damping and ripple current capability. The values selected have a filter resonant frequency that is below the converter switching frequency, thus avoiding high circulating currents in the filter. QUICK START PROCEDURE Demonstration circuit 1739 is easy to set up to evaluate the performance of the LTC3765/LTC3766. 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 18V to 72V to 18V. 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 18V can keep the converter from turning on due to the undervoltage lockout feature of the LTC3765/LTC3766. b. If efficiency measurements are desired, an ammeter capable of measuring 10ADC or a resistor shunt can be put in series with the input supply in order to measure the DC1739A-B’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 never exceeds 75V. 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 12.5A 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 12.5ADC can be put in series with the output load in order to measure the DC1739A-B’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. dc1739afb 2 DEMO MANUAL DC1739A-B QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup DC1739A-B Efficiency 95 14 12 10 93 8 6 92 POWER DISSIPATION (W) EFFICIENCY ( %) 94 4 Eff, 24VIN Eff, 48VIN PD, 24VIN PD, 48VIN 91 90 2 0 2 4 6 8 10 12 IOUT (A) dc1739a F02 Figure 2. Efficiency and Power Dissipation dc1739afb 3 DEMO MANUAL DC1739A-B QUICK START PROCEDURE Figure 3. Output Ripple at 48VIN and 11AOUT (50mV, 2μs/DIV, 20MHz) IOUT VOUT Figure 4. Transient Response Waveform at 48VIN and 6 – 12AOUT (5A, 500mV, 100μs/DIV) dc1739afb 4 DEMO MANUAL DC1739A-B Figure 5. Thermal Map, Frontside at 48VIN and 11AOUT (TA = 25°C, 200LFM) Figure 6. Thermal Map, Backside at 48VIN and 11AOUT (TA = 25°C, 200LFM) dc1739afb 5 DEMO MANUAL DC1739A-B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., AL., TH, 33μF, 100V, ME-PX series SUNCON, 100ME33PX 2 4 C2, C3, C4, C5 CAP., X7R, 2.2μF, 100V, 20%, 1210 MURATA, GRM32ER72A225MA35 3 1 C6 CAP., C0G, 47pF, 200V, 5%, 1206 AVX, 12062A470JAT2A 4 2 C8, C9 CAP., POSCAP, 68μF, 16V, 20%, 7343 SANYO, 16TQC68M 5 1 C10 CAP., X7R, 1.0nF, 630V, 10%, 1206 MURATA, GRM31A7U2J102J 6 2 C11, C12 CAP., X7R, 22μF, 16V, 1210 MURATA, GRM32ER71C226ME20 7 1 C13 CAP., X7R, 1.0μF, 100V, 10%, 1206 MURATA, GRM31CR72A105KA01 8 1 C14 CAP., X7R, 0.1μF, 250V, 10%, 1206 MURATA, GRM31CR72E104KW03 9 1 C16 CAP., C0G, 1000pF, 25V, 5%, 0402 TDK, C1005C0G1E102J 10 3 C17, C20, C35 CAP., X7R, 0.1μF, 25V, 10%, 0603 AVX, 06033C104KAT2A 11 1 C18 CAP., C0G, 470pF, 25V, 5%, 0603 AVX, 06033A471JAT2A 12 2 C21, C23 CAP., X7R, 1.0uF, 16V 10%, 0805 MURATA, GRM21BR71C105KA01L 13 1 C22 CAP., C0G, 220pF, 25V, 5%, 0603 AVX, 06033A221JAT2A 14 1 C24 CAP., X7R, 2200pF, 250V, 10%, 1812 MURATA, GA343QR7GD222KW01L 15 1 C25 CAP., COG, 0.033μF, 25V, 5%, 0805 TDK, C2012C0G1E333J 17 1 C27 CAP., X7R, 10μF, 16V, 1206 MURATA, GRM31CR61C106MA88 18 1 C28 CAP., X7R, 0.010μF, 50V, 10%, 0603 AVX, 06035C103KAT2A 19 1 C29 CAP., X7R, 0.033μF, 25V, 10%, 0603 AVX, 06033C333KAT2A 20 3 C30, C31, C37 CAP., C0G, 1000pF, 25V, 5%, 0603 AVX, 06033A102JAT2A 21 1 C32 CAP., C0G, 47pF, 25V, 5%, 0603 AVX, 06033A470JAT2A 22 1 C33 CAP., C0G, 2200pF, 25V, 5%, 0603 TDK, C1608C0G1E222J 24 2 D1, D4 DIODE ULTRA FAST 1A 200V SMP VISHAY, ES1PD-M3 / 84A 25 2 D3, D5 DIODE SCHOTTKY 40V 0.4A SOD323 DIODES INC., ZHCS400TA 26 1 L1 INDUCTOR, 1.5μH 20% VISHAY, IHLP2525EZER1R5M01 27 1 L4 INDUCTOR, 8.0μH PULSE PA2729.802NL 28 1 Q1 MOSFET, N-CH 120V POWERPAK-SO-8 FAIRCHILD, FDMS86201 29 1 Q3 MOSFET, N-CH 80V POWERPAK-SO-8 FAIRCHILD, FDMS86322 30 1 Q4 MOSFET, N-CH 150V POWERPAK-SO-8 FAIRCHILD, FDMS86200 31 1 Q5 MOSFET, P-CH, IRF6217, SO-8 IR, IRF6217TR 32 1 Q6 MOSFET, N-CH, SUPER SOT-6 FAIRCHILD, FDC2512-NL 33 1 Q7 Transistor, NPN, SOT23 DIODES, FMMT491A 34 1 Q8 Transistor, NPN, SOT323 DIODES, MMST3904 35 1 R1 RES., CHIP, 51.1, 1/4W, 1%, 1206 VISHAY, CRCW120651R1FKEA 36 2 R4, R5 RES., CHIP, 68.1k, 1/4W, 1%, 1206 VISHAY, CRCW120668K1FKEA 37 1 R7, R37 RES., CHIP, 909, 1/8W, 1%, 0805 VISHAY, CRCW0805909RFKEA 39 1 R10 RES., CHIP, 0.004, 1W, 1%, 2512 Panasonic, ERJ-M1WTF4M0U 40 1 R11 RES., CHIP, 75, 1/8W, 1%, 0805 VISHAY, CRCW080575R0FKEA 42 1 R14 RES., CHIP, 0.006, 1W, 1%, 2512 Panasonic, ERJ-M1WSF6M0U ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER RES., CHIP, 61.9k, 1/8W, 1%, 0805 VISHAY, CRCW080561K9FKEA Required Circuit Components 44 1 R17 dc1739afb 6 DEMO MANUAL DC1739A-B PARTS LIST 45 1 R18 RES., CHIP, 100k, 1/8W, 5%, 0805 VISHAY, CRCW0805100KJNEA 46 4 R19, R20, R23, R24 RES., CHIP, 100, 1/32W, 1%, 0402 VISHAY, CRCW0402100RFKEA 47 1 R22 RES., CHIP, 1.82k, 1/4W, 1%, 1206 VISHAY, CRCW12061K82FKEA 48 1 R25 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA 49 1 R27 RES., CHIP, 0.750, 1/8W, 1%, 0805 SUSUMU, RL1220S-R75-F 50 1 R29 RES., CHIP, 19.1k, 1/16W, 1%, 0603 VISHAY, CRCW060319K1FKEA 51 1 R35 RES., CHIP, 1.82k, 1/16W, 1%, 0603 VISHAY, CRCW06031K82FKEA 52 1 R36 RES., CHIP, 11.5k, 1/16W, 1%, 0603 VISHAY, CRCW060311K5FKEA 53 2 R38, R39 RES., CHIP, 100, 1/16W, 1%, 0603 VISHAY, CRCW0603100RFKEA 55 1 R41 RES., CHIP, 4.12k, 1/16W, 1%, 0603 VISHAY, CRCW06034K12FKEA 56 1 R44 RES., CHIP, 56.2k, 1/16W, 1%, 0603 VISHAY, CRCW060356K2FKEA 57 1 R46 RES., CHIP, 60.4k, 1/16W, 1%, 0603 VISHAY, CRCW060360K4FKEA 58 1 R47 RES., CHIP, 15.0k, 1/16W, 1%, 0603 VISHAY, CRCW060315K0FKEA 59 1 R48 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA 60 1 R49 RES., CHIP, 1.87k, 1/16W, 1%, 0603 VISHAY, CRCW06031K87FKEA 61 1 R50 RES., CHIP, 604, 1/16W, 1%, 0603 VISHAY, CRCW0603604RFKEA 62 1 R51 RES., CHIP, 13.3k, 1/16W, 1%, 0603 VISHAY, CRCW060313K3FKEA 63 1 R52 RES., CHIP, 22k, 1/16W, 5%, 0603 VISHAY, CRCW060322KJNEA 64 1 R53 RES., CHIP, 8.25k, 1/16W, 1%, 0603 VISHAY, CRCW06038K25FKEA 65 1 R56 RES., CHIP, 1.00k, 1/16W, 1%, 0603 VISHAY, CRCW06031K00FKEA 66 1 T1 TRANSFORMER, 4T:4T:4T PULSE, PA0801NL 67 1 T3 TRANSFORMER, 1.25T:1T PULSE, PA3493NL 68 1 U1 I.C. LTC3765EMSE, MSOP-16PIN LINEAR TECH., LTC3765EMSE 69 1 U2 I.C. LTC3766EGN28, SSOP-GN28 LINEAR TECH., LTC3766EGN Additional Demo Board Circuit Components 70 0 C7 CAP., OPT, 0805 71 0 C15 CAP., OPT, 0603 72 0 C36 CAP., OPT, 0402 16 1 C26 0Ω Jumper 0603 72 0 C34 CAP., OPT, 1206 73 0 D6 DIODE OPT SOT23 74 0 L5 INDUCTOR, OPT 1608 75 0 Q2 MOSFET OPT POWERPAK-SO-8 VISHAY, CRCW06030000Z0EA 0 Q8 TRANSISTOR OPT NPN SOT323 38 8 R9, R21, R30-R33, R45, R54 0Ω Jumper 0402 76 0 R12, R13, R28, R43 RES., OPT, 0402 77 0 R15, R26, R42 RES., OPT, 0603 54 1 R40 0Ω Jumper 0603 VISHAY, CRCW06030000Z0EA VISHAY, CRCW04020000Z0ED Hardware For Demo Board Only 78 4 E1, E2, E3, E4 TESTPOINT, TURRET, .090" pbf MILL-MAX, 2501-2-00-80-00-00-07-0 79 4 J1, J2, J3, J4 Connector, Banana Jack KEYSTONE, 575-4 80 4 MTGS at 4 Corners STANDOFF, NYLON .5 1/2" KEYSTONE, 8833(SNAP-ON) dc1739afb 7 A B C 5 R48 4.99K R17 61.9K 0805 -VIN 18 to 72 VIN C1 33uF 100V C28 10nF + C23 1uF 0805 11 RCORE 13 SSFLT 12 RUN 3 VCC C3,C4,C5 2.2uF x3 100V 1210 C29 R51 33nF 13.3K Q6 FDC2512 D3 ZHCS400 C2 2.2uF 100V 1210 VIN R18 100K 0805 1nF C16 R19 100 U1 LTC3765EMSE R52 22K R20 100 R14 0.006 2512 4 C30 1nF C31 1nF 100 R39 R38 100 C22 220pF AS C20 0.1uF R25 10K Q5 IRF6217 Unless otherwise specified: All resistors are in ohms 0603. All capacitors are in microfarads 0603. All capacitors are 25V. 1/16W = 0603, 1/8W = 0805, 1/4W = 1206. R53 8.25K AG 4 ISMAG 5 IN- 16 IN+ 15 C17 0.1uF D5 ZHCS400 Q1 FDMS86201 C13 1.0uF 100V 1210 C24 T3 1T 4 6 R29 RS- FG C6 47pF 200V 1206 1.82K 1206 R22 0.004 2512 R10 R1 51.1 1206 RS+ R37 909 0805 R7 909 0805 3 FG 2 1 0.1uF C35 C10 1nF 630V 1206 C25 33nF COG 0805 2 Fsw=240KHz R44 56.2K VCC LTC3766EGN VCC + C18 470pF R46 R47 60.4K 15.0K C32 47pF 1 FB 6 VS- 13 VS+ 12 C33 2.2nF R41 4.12K -VOUT 1 -VOUT R50 R49 1.87K 604 R56 1.00K C37 1.0nF 12V / 12.5A +VOUT R35 R36 1.82K 11.5K -VOUT C8,C9 68uF x2 16V +VOUT RSRS+ R24 R23 100 100 0402 0402 C11,C12 22uF x2 16V 1210 10uF 16V 1206 C27 R4,R5 68.1K x2 = 34K 1206 +VOUT Q7 FMMT491A Q4 FDMS86200 ES1PD D1 L4 8.0uH U2 NOTE: 2.2uF 100V Murata GRM32ER72A225MA35 (X7R 1210) 22uF 16V Murata GRM32ER61C226ME20 (X7R 1210) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 68uF 16V Sanyo 16TQC68M 33uF 100V Suncon 100ME33PX (10x12mm) L1 Vishay IHLP2525EZER1R5M01 L4 Pulse PA2729.802NL T1 PA0801NL T3 PA3493NL +VOUT 25 PT- 19.1K -VOUT C21 26 PT+ 1uF 0805 2.2nF -VOUT 250V 1812 1.25T 3 1 5 4T 3 4 4T 2 Q3 FDMS86322 D4 ES1PD R11 75 0805 R27 0.75 AS 0805 C14 0.1uF 1206 7 4T T1 RUN 8 11 9 VIN 2 SS L1 1.5uH FGD/SWB 20 REGSD 16 3 SW 23 GND 14 +VIN NDRV 14 FS/UV 10 VSEC 3 27 FG 2 PGND SG 1 PHASE 5 VAUX 24 10 VIN 22 IPK D GND2 1 NDRV 21 MODE 4 4 FS/SYNC 15 PG 2 GND 17 9 19 VCC 28 SGD IS- 7 PGND IS- 17 ITH 7 IS+ 8 DELAY 6 IS+ 18 VSOUT 8 11 5 A B C D DEMO MANUAL DC1739A-B SIMPLE SCHEMATIC DIAGRAM dc1739afb 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 E2 J2 18 to 72 VIN + 5 R48 4.99K R17 61.9K 0805 C1 33uF 100V C2 2.2uF 100V 1210 PG C28 10nF PGNDP C23 1uF 0805 3 OPT 0402 R12 R18 100K 0805 PG R13 OPT 0402 0603 1nF C16 R19 100 0 0402 R9 SGNDP 4 PGNDP Q8 OPT 4 R20 100 R14 0.006 2512 U1 LTC3765EMSE R52 22K R15 OPT SGNDP SGNDP C36 OPT 0402 R51 13.3K 11 RCORE 13 SSFLT 12 RUN VIN C5 2.2uF 100V 1210 3 VCC C4 2.2uF 100V 1210 C29 33nF Q6 FDC2512 D3 ZHCS400 C3 2.2uF 100V 1210 VIN C31 1nF SGNDP C30 1nF 100 R39 R38 100 C22 220pF C14 0.1uF 1206 Q5 IRF6217 AS C20 0.1uF R25 10K 4 Unless otherwise specified: All resistors are in ohms 0603. All capacitors are in microfarads 0603. All capacitors are 25V. 1/16W = 0603, 1/8W = 0805, 1/4W = 1206. R53 8.25K ISMAG 5 IN- 16 IN+ 15 D5 ZHCS400 SGNDP PGNDP C17 0.1uF 123 Q1 FDMS86201 Q2 OPT 5678 AG 4 J1 6 5 2 1 4 5 6 7 8 C13 1.0uF 100V 1210 7 4T 11 5 4T 3 4 4T 2 6 C24 T3 1T 4 6 PGND R29 0 R40 R1 RS+ R30 0 0402 R37 909 0805 R7 909 0805 51.1 1206 3 321 8765 RS- R31 0 0402 FG R32 0 0402 2 ES1PD D1 L4 8.0uH 1 R33 0 0402 PGND VAUX R28 OPT 0402 C15 OPT 50V Q4 4 FDMS86200 SGND PGND R42 OPT C25 C26 33nF 0ohms COG 0805 PGND 2 VA OPT D6 Fsw=240KHz R44 56.2K R43 OPT 0402 C11 22uF 16V 1210 C12 22uF 16V 1210 OPT L5 VCC R46 R47 60.4K 15.0K PGND C34 OPT 1206 VAUX + C8 68uF 16V C18 470pF R26 OPT 0603 C32 47pF VPK C33 2.2nF R41 4.12K VCC 1 0 0402 R54 E4 J4 J3 E3 +VOUT SGND R56 1.00K C37 1.0nF -VOUT 12V / 12.5A +VOUT R50 R49 1.87K 604 R35 R36 1.82K 11.5K 68uF 16V + C9 +VOUT 1 C27 10uF 16V 1206 PGND FB 6 VS- 13 VS+ 12 RSRS+ R24 R23 100 100 0402 0402 PGND C35 0.1uF VCC VPK R45 0 0402 LTC3766EGN R5 68.1K 1206 C10 1nF 630V 1206 0402 Q7 FMMT491A R21 0 R4 68.1K 1206 U2 NOTE: 2.2uF 100V Murata GRM32ER72A225MA35 (X7R 1210) 22uF 16V Murata GRM32ER61C226ME20 (X7R 1210) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 68uF 16V Sanyo 16TQC68M 33uF 100V Suncon 100ME33PX (10x12mm) L1 Vishay IHLP2525EZER1R5M01 L4 Pulse PA2729.802NL T1 PA0801NL T3 PA3493NL +VOUT 25 PT- 1.82K 1206 R22 0.004 2512 RS- R10 4 FG C7 OPT 0805 C6 47pF 200V 1206 19.1K SGND C21 26 PT+ 1uF 0805 321 8765 PGNDP 2.2nF PGND 250V 1812 1.25T 3 1 VA Q3 FDMS86322 D4 ES1PD R11 75 0805 R27 0.75 AS 0805 1 2 3 1 8 T1 RUN L1 1.5uH SS 9 E1 REGSD 16 +VIN VSEC 3 2 FS/SYNC 15 3 SGD 19 4 IS- 17 ITH 7 D FS/UV 10 NDRV 14 17 FGD/SWB 20 14 PG 2 GND 9 SW 23 GND FG 2 PGND 27 SG 1 PHASE 5 VAUX 24 10 VIN 22 IPK IS+ 8 GND2 PGND 1 NDRV 21 MODE 4 IS- 7 DELAY 6 VCC 28 IS+ 18 VSOUT 11 5 A B C D DEMO MANUAL DC1739A-B FULL SCHEMATIC DIAGRAM dc1739afb 9 DEMO MANUAL DC1739A-B 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 dc1739afb 10 Linear Technology Corporation LT 0612 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 2011