1 description lt 3752/lt 8311 active clamp forward converter with synchronous rectification demonstration circuit 1994a is an active clamp forward converter with synchronous rectification featuring the lt ? 3752/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 18 to 72v: suitable for telecom, industrial, and other applications. it has an eighth- brick footprint area. synchro - nous rectification helps to attain efficiency exceeding 94%. the dc1994 circuit features soft-start which prevents output voltage overshoot on startup or when recovering from overload condition. the dc1994 also has precise overcurrent protection circuit that allows for continuous operation under short circuit conditions. the low power dissipation under a short circuit 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 condition ensures high reliability even during a prolonged output voltage short circuit. the lt 3752 includes an internal constant frequency flyback controller for creating a housekeeping voltage supply. the housekeeping supply is able to efficiently provide bias for both primary and secondary ics, and eliminates the need to generate bias supplies from auxiliary windings in the main forward transformer. the housekeeping supply also allows bias to any secondary side ic before the main forward converter starts switching. please refer to LT3752 data sheet for design details and applications information. design files for this circuit board are available at http://www .linear.com/demo/dc1994a specifications are at t a = 25c symbol parameter conditions min typ max units v in input supply range 18 72 v v out output voltage 11.76 12.0 12.24 v i out maximum output current, continuous 200lfm 12 a fsw switching (clock) frequency 240 khz v out p-p output ripple v in = 48v, i out = 12a (20mhz bw) 100 mv pCp i reg output regulation line and load (18v in to 72v in , 0a out to 12a out ) 0.08 % p out /p in efficiency (see figure 2) v in = 48v, i out = 12a 94 % dc1994afa demo manual dc1994a
2 quick start procedure demonstration circuit 1994 is easy to set up to evaluate the performance of the LT3752/ lt8311 chipset. 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 200 lfm across the unit for sustained operation at full load. 3. with power off, connect the supply to the input terminals +v in and Cv in . a. input voltages lower than 18 v can keep the converter from turning on due to the undervoltage lockout feature of the LT3752/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 dc1994as 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, con - nect a variable load capable of sinking 12a at 12v to the output terminals +v out and Cv out . 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 dc1994as 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. dc1994afa demo manual dc1994a
3 quick start procedure + ? ? + + ? + ? ? + i in v in v in v out i out ?load + figure 1. proper measurement equipment setup figure 2. efficiency 0.0 70.00 95.00 90.00 85.00 80.00 75.00 100.00 6.0 8.0 10.0 12.0 2.0 4.0 72v in 48v in 24v in 18v in dc1994afa demo manual dc1994a
4 quick start procedure 100mv/div 2s/div 5a/div 200mv/div 100s/div figure 3. output ripple at 48v in and 12a out (20mhz bw) figure 4. transient response waveform at 48v in and 6a out to 12a out dc1994afa demo manual dc1994a
5 quick start procedure figure 5. thermal map, frontside at 48v in and 12a out (t a = 25c, 200lfm) figure 6. thermal map, backside at 48v in and 12a out (t a = 25c, 200lfm) dc1994afa demo manual dc1994a
6 parts list item qty reference part description manufacturer / part number required circuit components 1 3 cin1, cin2, cin3 cap., x7s, 4.7f, 100v, 10%, 1210 tdk, cga6m3x7s2a475k 2 2 co1, co2 cap., x7r, 33f, 16v, 20%, 1812 tdk, c4532x7r1c336m 3 1 csys cap., alum., 470f, 16v, svpe series panasonic , 16svpe470m 4 1 cy1 cap., x7r, 2200pf, 250v, 10%, 1812 murata , ga343qr7gd222kw01l 5 1 c1 cap., x7r, 0.33f, 10v, 5%, 0603 kemet c0603c334j4ractu 6 2 c2, c25 cap., x5r, 4.7f, 25v, 10%, 0805 murata , grm21br61e475ka12l 7 2 c3, c5 cap., x7r, 22nf, 25v, 10%, 0603 avx , 06033c223 kat 2a 8 2 c4, c19 cap., x7s, 1f, 100v, 10%, 0805 tdk, c2012x7s2a105k 9 1 c10 cap., np0, 10pf, 25v, 5%, 0603 avx , 06033a100 jat 2a 10 1 c12 cap., x7r, 0.1f, 25v, 10% 0603 avx , 06033c104 kat 2a 11 1 c13 cap., x7r, 1f, 16v, 10%, 0603 avx , 0603yc105 kat 2a 12 1 c14 cap., x7r, 15nf, 250v, 10%, 1206 murata , grm31br72e153kw01l 13 2 c17, c18 cap., x7r, 2.2f, 25v, 20%, 0805 avx , 08053c225 mat 2a 14 1 c21 cap., npo, 220pf, 25v, 10%, 0603 avx , 06033a221 kat 2a 15 1 c22 cap., np0, 68pf, 25v, 10%, 0603 avx , 06033a680 kat 2a 16 1 c23 cap., x7r, 4.7nf, 25v, 10%, 0603 avx , 06033c472 kat 2a 17 1 c26 cap., x7r, 220 nf, 16v, 5%, 0603 samsung, cl10b224jo8nnnc 18 1 c30 cap., x7r, 2.2nf, 250v, 10%, 0805 murata , grm21ar72e222kw01d 19 3 d1, d2, d5 diode, high-speed diode, sod-523 nxp/phillips semi., bas516 20 1 d8 diode, cmmr1u-02 sod-123 central semi., cmmr1u-02 tr 21 1 l1 inductor, 6.8h champs tech., pqi2050-06r8 22 2 q1, q4 mosfet, n-ch, 120v, pg-tdson-8 infineon, bsc077n12ns3 g 23 1 q2 mosfet, n-ch, 100v, 60a, power 56 fairchild , fdms86101dc 24 1 q3 mosfet, si2325ds, sot-23 vishay , si2325ds-t1-e3 25 1 q5 mosfet, n-ch, 250v, sot23-6 diodes/zetex, zvn4525e6ta 26 1 rcs1 res., chip, 0.008, 1w, 1%, rl3720w susumu, rl3720wt -r008-f 27 1 rcs2 res., chip, 0.15, 0.125w, 1%, 0805 vishay , wsl0805r1500fea 28 1 r1 res., chip, 31.6k, 0.1w, 1%, 0603 vishay , crcw060331k6fkea 29 1 r2 res., chip, 34k, 0.1w, 1%, 0603 vishay , crcw060334k0fkea 30 1 r3 res., chip, 7.32k, 0.1w, 1%, 0603 vishay , crcw06037k32fkea 31 1 r4 res., chip, 22.6k, 0.1w, 1%, 0603 vishay , crcw060322k6fkea 32 1 r5 res., chip, 49.9k, 0.1w, 1%, 0603 vishay , crcw060349k9fkea 33 1 r6 res., chip, 71.5k, 0.1w, 1%, 0603 vishay , crcw060371k5fkea 34 1 r7 res., chip, 1.82k, 0.1w, 1%, 0603 vishay , crcw06031k82fkea 35 1 r8 res., chip, 5.9k, 0.1w, 1%, 0603 vishay , crcw06035k90fkea 36 1 r9 res., chip, 100k, 0.125w, 1%, 0805 vishay , crcw0805100 kfkea 37 1 r13 res., chip, 499, 0.1w, 1%, 0603 vishay , crcw0603499rfkea 38 1 r14 res., chip, 2.8k, 0.1w, 1%, 0603 vishay , crcw06032k80fkea 39 1 r15 res., chip, 1.10k, 0.1w, 1%, 0603 vishay , crcw06031k10fkea 40 2 r16, r25 res., chip, 10k, 0.1w, 5%, 0603 vishay , crcw060310k0jnea dc1994afa demo manual dc1994a
7 parts list item qty reference part description manufacturer / part number 41 7 r17, r39, r49, r50-r53 res., chip, 0, 0.1w, 0603 vishay , crcw06030000z0ea 42 3 r18, r19, r46 res., chip, 100k, 0.1w, 1%, 0603 vishay , crcw0603100kfkea 43 1 r20 res., chip, 15, 0.1w, 1%, 0603 vishay , crcw060315r0fkea 44 2 r21, r22 res., chip, 2k, 0.1w, 1%, 0603 vishay , crcw06032k00fkea 45 1 r23 res., chip, 100, 0.1w, 5%, 0603 vishay , crcw0603100rjnea 46 1 r24 res., chip, 1k, 0.1w, 1%, 0603 vishay , crcw06031k00fkea 47 1 r28 res., chip, 12.4k, 0.1w, 1%, 0603 vishay , crcw060312k4fkea 48 1 r29 res., chip, 20k, 0.1w, 1%, 0603 vishay , crcw060320k0fkea 49 1 r30 res., chip, 3.4k, 0.1w, 1%, 0603 vishay , crcw06033k40fkea 50 1 r31 res., chip, 499k, 0.1w, 1%, 0603 vishay , crcw0603499kfkea 51 1 r33 res., chip, 11.3k, 0.1w, 1%, 0603 vishay , crcw060311k3fkea 52 1 r37 res., chip, 13.7k, 0.1w, 1%, 0603 vishay , crcw060313k7fkea 53 1 r38 res., chip, 560, 0.1w, 5%, 0603 vishay , crcw0603560rjnea 54 1 r41 res., chip, 0, 0.125w, 1%, 0805 vishay , crcw08050000z0ea 55 1 r45 res., chip, 200, 0.1w, 1%, 0603 vishay , crcw0603200rfkea 56 1 r47 res., chip, 200, 0.125w, 1%, 0805 vishay , crcw0805200rfkea 57 1 r48 res., chip, 20k, 0.25w, 1%, 1206 vishay , crcw120620k0fkea 58 1 t1 transformer, smt champs tech., g45ah2-0404-04 59 1 t2 transformer, smt gate drive xfmr pulse, pe-68386nl 60 1 t3 transformer, flyback converter xfmr bh elect., l00-3250 61 1 u1 i.c., lt8311efe#pbf tssop-20 linear tech., lt8311efe#pbf 62 1 u 2 i.c., LT3752efe#pbf tssop-38 linear tech,. LT3752efe#pbf 63 1 u3 i.c., ps2801c-1-p-a nec, ps2801c-1-p-a additional demo board circuit components 1 0 c6, c32 ( opt ) cap., 0603 2 0 c15 (tbd) cap., 1210 3 0 c20 ( opt ) cap., 0805 4 0 r12, r26 ( opt ) res., 0805 5 0 r32, r40, r44 ( opt ) res., chip, 0603 6 0 r42, r43 ( opt ) res., chip, 0805 hardware: for demo board only 1 4 e1 to e4 testpoint, turret, .061" mill-max, 2308-2-00-80-00-00-07-0 2 4 e5 to e8 testpoint, turret, .094" mill-max, 2501-2-00-80-00-00-07-0 3 4 j1 to j4 banana jack keystone, 575-4 4 4 mh1 to mh4 stand -off, nylon 0.25" keystone, 8831(snap on) 5 1 fab , printed circuit board demo circuit 1994a 6 2 stencil (top & bottom) stencil dc1994a dc1994afa demo manual dc1994a
8 simple schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a +vout +12v / 12a -vin 18v - 72v 16svpe470m +vin note: unless otherwise specified: all resistors & capacitors are 0603 . all resistors are 1% multilayer resistors. all ceramic capacitors are x7r eval1: efe package (fe38 (31) ) board size: 2.30 by 1.45 -vout cin1,cin2,cin3: cga6m3x7s2a475k +vo1 sw1 +vo1 cg fg intvcc intvcc vaux intvcc cg fg cs- cs- sgnd sgnd sw1 vaux l1 6.8uh pqi2050-6r8 l1 6.8uh pqi2050-6r8 t3 bh, l00-3250 t3 bh, l00-3250 8 5 7 1 2 4 r19 100k r19 100k c5 22nf c5 22nf q4 bsc077n12ns3 g q4 bsc077n12ns3 g r38 560 r38 560 cy1 2200pf 250v 1812 cy1 2200pf 250v 1812 r21 2k r21 2k r23 100 r23 100 r20 15 r20 15 rcs1 0.008 0815 rcs1 0.008 0815 r25 10k r25 10k r37 13.7k r37 13.7k t1 g45ah2-0404-04 t1 g45ah2-0404-04 3 2 4 5 7 8 10 11 u2 LT3752efe u2 LT3752efe comp 5 f b 4 r t 3 sync 6 tblnk 14 ss1 7 tos 13 gnd 1 8 hcom p 2 ss2 1 7 out 24 aout 32 oc 22 isensen 20 isensep 21 v i n 2 8 hout 3 4 hisense 3 6 h f b 1 tas 12 tao 11 ivsec 8 uvlo_vsec 9 ovlo 10 intvcc 26 sout 30 p g n d 1 9 p g n d 3 8 p g n d 3 9 nc 15 nc 16 nc 37 r33 11.3k r33 11.3k c25 4.7uf 0805 c25 4.7uf 0805 d2 bas516 d2 bas516 r7 1.82k r7 1.82k u3 ps2801-1 u3 ps2801-1 1 3 4 2 c30 2.2nf 250v 0805 c30 2.2nf 250v 0805 r5 49.9k r5 49.9k cin2 100v cin2 100v c13 1uf c13 1uf j3 j3 r9 100k 0805 r9 100k 0805 c23 4.7nf c23 4.7nf r1 31.6k 240khz r1 31.6k 240khz j1 j1 c12 0.1uf c12 0.1uf r48 20k 1206 r48 20k 1206 r30 3.4k r30 3.4k rcs2 0.15 0805 rcs2 0.15 0805 j4 j4 t2 pe-68386nl t2 pe-68386nl 1 2 3 4 6 5 r31 499k r31 499k r47 200 0805 r47 200 0805 r24 1k r24 1k lt8311efe u1 lt8311efe u1 csw 1 fsw 3 fg 5 intvcc 6 vin 7 pmode 8 opto 9 comp 10 fb 11 timer 12 p good 1 3 ss 14 sync 15 cg 16 csn 18 csp 20 gnd 21 r29 20k r29 20k c26 220nf c26 220nf c22 68pf c22 68pf c21 220pf c21 220pf r6 71.5k r6 71.5k d1 bas516 d1 bas516 r13 499 r13 499 c14 1206 250v 15nf c14 1206 250v 15nf r14 2.8k r14 2.8k c1 0.33uf c1 0.33uf d5 bas516 d5 bas516 22uf 16v co1 1812 22uf 16v co1 1812 q5 zvn4525e6 q5 zvn4525e6 cin1 4.7uf 1210 cin1 4.7uf 1210 r18 100k r18 100k c10 10pf c10 10pf r4 22.6k r4 22.6k r8 5.9k r8 5.9k 22uf 16v co2 1812 22uf 16v co2 1812 r15 1.1k r15 1.1k c19 1uf 0805 100v c19 1uf 0805 100v c17 2.2uf 0805 c17 2.2uf 0805 e3 pgood e3 pgood r28 12.4k r28 12.4k c18 2.2uf 0805 c18 2.2uf 0805 r46 100k r46 100k r3 7.32k r3 7.32k c3 22nf c3 22nf + csys 470uf 16v + csys 470uf 16v q2 fdms86101dc q2 fdms86101dc q1 bsc077n12ns3 g q1 bsc077n12ns3 g c4 1uf 100v 0805 c4 1uf 100v 0805 c2 4.7uf 25v 0805 c2 4.7uf 25v 0805 q3 si2325ds q3 si2325ds 1 3 2 cin3 cin3 j2 j2 r2 34k r2 34k r16 10k r16 10k d8 cmmr1u-02 d8 cmmr1u-02 r45 200 r45 200 dc1994afa demo manual dc1994a
9 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 representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. full schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a +vout +12v / 12a -vin 18v - 72v 16svpe470m +vin note: unless otherwise specified: all resistors & capacitors are 0603 . all resistors are 1% multilayer resistors. all ceramic capacitors are x7r eval1: efe package (fe38 (31) ) board size: 2.30 by 1.45 -vout sync gnd cin1,cin2,cin3: cga6m3x7s2a475k 5v/12a sw2 +vo1 vaux sw1 +vo1 cg fg intvcc intvcc vaux intvcc t1-2 t1-4 t1-2 t1-4 sw1 sw2 cg fg sw2 cs+ cs+ sw1 cs- cs- sgnd sgnd sw1 size date: . v e r . o n c i sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 1994a friday, february 21, 2014 1 1 48vin to 12v, 12a isolated dc/dc converter in 1/8 brick n/a LT3752efe / lt8311efe size date: . v e r . o n c i sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 1994a friday, february 21, 2014 1 1 48vin to 12v, 12a isolated dc/dc converter in 1/8 brick n/a LT3752efe / lt8311efe size date: . v e r . o n c i sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 1994a friday, february 21, 2014 1 1 48vin to 12v, 12a isolated dc/dc converter in 1/8 brick n/a LT3752efe / lt8311efe l1 6.8uh pqi2050-6r8 l1 6.8uh pqi2050-6r8 pa2720nl t1(opt 2) pa2720nl t1(opt 2) 10 2 4 7 1 8 6 5 9 r52 0 r52 0 t3 bh, l00-3250 t3 bh, l00-3250 8 5 7 1 2 4 r19 100k r19 100k c5 22nf c5 22nf q4 bsc077n12ns3 g q4 bsc077n12ns3 g r38 560 r38 560 cy1 2200pf 250v 1812 cy1 2200pf 250v 1812 r21 2k r21 2k e5 e5 r23 100 r23 100 r20 15 r20 15 rcs1 0.008 0815 rcs1 0.008 0815 r25 10k r25 10k r40 opt r40 opt r37 13.7k r37 13.7k t1 g45ah2-0404-04 t1 g45ah2-0404-04 3 2 4 5 7 8 10 11 u2 LT3752efe u2 LT3752efe comp 5 f b 4 r t 3 sync 6 tblnk 14 ss1 7 tos 13 gnd 1 8 hcom p 2 ss2 1 7 out 24 aout 32 oc 22 isensen 20 isensep 21 v i n 2 8 hout 3 4 hisense 3 6 h f b 1 tas 12 tao 11 ivsec 8 uvlo_vsec 9 ovlo 10 intvcc 26 sout 30 p g n d 1 9 p g n d 3 8 p g n d 3 9 nc 15 nc 16 nc 37 r33 11.3k r33 11.3k c25 4.7uf 0805 c25 4.7uf 0805 d2 bas516 d2 bas516 r7 1.82k r7 1.82k u3 ps2801-1 u3 ps2801-1 1 3 4 2 c30 2.2nf 250v 0805 c30 2.2nf 250v 0805 r5 49.9k r5 49.9k r22 2k r22 2k cin2 100v cin2 100v c13 1uf c13 1uf j3 j3 r9 100k 0805 r9 100k 0805 c23 4.7nf c23 4.7nf r1 31.6k 240khz r1 31.6k 240khz j1 j1 r53 0 r53 0 c12 0.1uf c12 0.1uf r48 20k 1206 r48 20k 1206 r30 3.4k r30 3.4k rcs2 0.15 0805 rcs2 0.15 0805 r51 0 r51 0 r17 0 r17 0 e6 e6 j4 j4 t2 pe-68386nl t2 pe-68386nl 1 2 3 4 6 5 r31 499k r31 499k r49 0 r49 0 r47 200 0805 r47 200 0805 c15 opt 200v 1210 47nf c15 opt 200v 1210 47nf r42 opt 0805 r42 opt 0805 r24 1k r24 1k lt8311efe u1 lt8311efe u1 csw 1 fsw 3 fg 5 intvcc 6 vin 7 pmode 8 opto 9 comp 10 fb 11 timer 12 p good 1 3 ss 14 sync 15 cg 16 csn 18 csp 20 gnd 21 r29 20k r29 20k c26 220nf c26 220nf c22 68pf c22 68pf c21 220pf c21 220pf r6 71.5k r6 71.5k d1 bas516 d1 bas516 r13 499 r13 499 c14 1206 250v 15nf c14 1206 250v 15nf r14 2.8k r14 2.8k c1 0.33uf c1 0.33uf d5 bas516 d5 bas516 22uf 16v co1 1812 22uf 16v co1 1812 q5 zvn4525e6 q5 zvn4525e6 cin1 4.7uf 1210 cin1 4.7uf 1210 r18 100k r18 100k c10 10pf c10 10pf c32 opt c32 opt r43 opt 0805 r43 opt 0805 e8 e8 r4 22.6k r4 22.6k c20 opt 0805 c20 opt 0805 r8 5.9k r8 5.9k 22uf 16v co2 1812 22uf 16v co2 1812 r15 1.1k r15 1.1k e4 vaux e4 vaux c19 1uf 0805 100v c19 1uf 0805 100v c17 2.2uf 0805 c17 2.2uf 0805 c6 opt c6 opt e3 pgood e3 pgood e2 e2 r28 12.4k r28 12.4k e7 e7 c18 2.2uf 0805 c18 2.2uf 0805 r46 100k r46 100k r3 7.32k r3 7.32k c3 22nf c3 22nf + csys 470uf 16v + csys 470uf 16v q2 fdms86101dc q2 fdms86101dc q1 bsc077n12ns3 g q1 bsc077n12ns3 g r50 0 r50 0 r39 0 r39 0 c4 1uf 100v 0805 c4 1uf 100v 0805 c2 4.7uf 25v 0805 c2 4.7uf 25v 0805 r12 opt 0805 r12 opt 0805 q3 si2325ds q3 si2325ds 1 3 2 r32 opt r32 opt cin3 cin3 j2 j2 r2 34k r2 34k r41 0 0805 r41 0 0805 r16 10k r16 10k r44 opt r44 opt r26 opt 0805 56 r26 opt 0805 56 d8 cmmr1u-02 d8 cmmr1u-02 r45 200 r45 200 e1 e1 dc1994afa demo manual dc1994a
10 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2014 lt 0314 rev a ? printed in usa demonstration board important notice linear technology corporation ( lt c ) 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 lt c 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 lt c 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 . lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c 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 lt c applica- tion engineer . mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc1994afa demo manual dc1994a
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