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1 description ltc 3892efe-1 polyphase high v out synchronous buck converter demonstration circuit 2190 a is a high output voltage, high efficiency synchronous polyphase ? buck converter featuring the lt c ? 3892 efe- 1 . this demo circuit is available in two versions. the input voltage range of both versions is from 16v to 55v. the dc 2190a-a is configured using two each LTC3892EFE-1 devices with 4-phase interleav - ing operation which provides a 12v/60 a output, while the dc 2190a-b is configured using one LTC3892EFE-1 device with 2-phase interleaving operation which provides a 12v/30a output. both boards have a mode selection jumper that allows the converter to run in forced ccm mode , pulse-skip mode or burst mode ? operation. synchronization to an external clock ( frequency range 100 khz to 300khz) is also possible on this board. l, lt , lt c , lt m , linear technology and the linear logo, polyphase and burst mode are registered trademarks of linear technology corporation . all other trademarks are the property of their respective owners. performance summary the demo circuit senses inductor current with a sense resistor but also has an optional dcr sense circuit that allows using the inductor s dcr as the current sensing element to save cost, footprint and improve efficiency. the ltc 3892 efe- 1 data sheet gives a complete description of these parts , operation and application information and must be read in conjunction with this quick start guide for dc2190a. design files for this circuit board are available at http://www .linear.com/demo/dc2190a specifications are at t a = 25c dc2190a-b symbol parameter conditions min typ max units v in input supply range 16 55 v v out output voltage range v in =16v to 55v, i out = 0a to 30a/2-phase 11.8 12 12.2 v f sw typical free running switching frequency 140 khz efficiency 2-phase efficiency see figure 3 for efficiency curves v in = 48v, v out1 = 12v, i out = 30a 97.2 % dc2190a-a symbol parameter conditions min typ max units v in input supply range 16 55 v v out output voltage range v in =16v to 55v, i out = 0a to 60a/4-phase 11.8 12 12.2 v f sw typical free running switching frequency 140 khz efficiency 4-phase efficiency see figure 4 for efficiency curves v in = 48v, v out1 = 12v, i out = 60a 97.2 % dc2190afa demo manual dc2190a-a/dc2190a-b
2 quick start procedure demonstration circuit dc 2190a is easy to set up to evalu - ate the performance of the ltc3892-1. refer to figure 1 for proper measurement equipment setup and follow the procedure below. note: when measuring the input or output voltage ripple , care must be taken to avoid a long ground lead on the oscilloscope probe. measure the input or output voltage ripple by touching the probe tip directly across the v in or v out and gnd terminals or directly across relevant capacitor. see figure 2 for proper scope probe technique . 1. place jumpers in the following positions: jp1: int. sync jp2: on jp3: int. (dc2190a-a only) 2. with power off , connect the input power supply to v in and gnd. connect the load to the output. the load current should be smaller than 60a for dc2190a-a and smaller than 30a for dc2190a-b. 3. turn on the power at the input . note: make sure that the input voltage is between 16v?and 55v. 4. check for the proper output voltages. v out = 11.8v to 12.2v note: if there is no output, temporarily disconnect the load to make sure that the load is not set too high. 5. once the proper output voltages ? are established , adjust the loads within the operating range and observe the output voltage regulation , ripple voltage , efficiency and other parameters. frequency synchronization and mode selection the dc2190as mode selector allows the converter to run in fcc operation , pulse-skip operation, burst mode or be synchronizing to an external clock by changing the position of jp1 and jp3. for synchronizing to an external clock source , apply the external clock from sync turret to gnd. refer to table 1 and to the data sheet for more details. table 1. mode selection and synchronizing operation options configuration jp1 jp3 (dc2190 a-a only) forced continuous conduction operation int. sync int. pulse-skip mode operation ext.sync/ pulse-skip. ext./pulse-skip burst mode operation burst ext./pulse-skip synchronize to ext. clock (ext. clock apply to sync turret ) ext. sync/ pulse-skip ext./pulse-skip optional inductor dcr current sensing demonstration circuit 2190 a provides an optional circuit for inductor dcr current sensing . inductor dcr current sensing uses the dcr of the inductor to sense the inductor current instead of discrete sense resistors. the advantages of dcr sensing are lower cost , reduced board space and higher efficiency, but the disadvantage is a less accurate current limit. if dcr sensing is used , be sure to select an inductor with sufficiently high saturation current or use an iron powder type material. refer to table 2 for optional inductor dcr current sensing setup and to the data sheet for more details. power the extv cc from external supply the dc2190 a extv cc turret is tied to the 12v v out by default. to power the extv cc from external supply: 1. remove the r7. 2. solder a 16v, 1 f mlcc between extv cc and gnd turret. 3. apply a dc voltage (<14v) between the extv cc and gnd turret , after the input voltage is established . ensure that extv cc v in . dc2190afa demo manual dc2190a-a/dc2190a-b
3 figure 1. proper measurement equipment setup ? + i out v v out load a v in supply ? + v v in i in a ? + quick start procedure table 2. optional inductor dcr current sensing configuration channel1 rs1 r18 r20 c13 c29 r23 r26 r24 channel2 rs2 r17 r19 c12 c28 r22 r25 r21 channel3 rs3 r63 r64 c63 c45 r77 r79 r65 channel4 rs4 r66 r67 c57 c48 r53 r54 r55 current sense resistor (default) ref. sch. ref. sch. ref. sch. ref. sch. open open open open inductor dcr current sensing 0? copper open open ref. sch. calculated value from data sheet 0? dc2190afa demo manual dc2190a-a/dc2190a-b
4 figure?2. measuring input or output ripple across terminals or directly across bulk capacitor quick start procedure + ? v out gnd c out gnd vin figure ?3. typical efficiency vs load current (dc2190a-b, 2-phase solution, v in = 48v) figure ?3. typical efficiency vs load current (dc2190a-a, 4-phase solution, v in = 48v) dc2190afa demo manual dc2190a-a/dc2190a-b 14 16 18 20 22 24 26 28 30 50 i out (a) 55 60 65 70 75 80 85 90 95 100 0 1 2 3 4 5 6 7 8 9 10 2 11 efficiency (%) power loss (w) dc2190a f03 efficiency power loss i out (a) 0 5 10 4 15 20 25 30 35 40 45 50 55 60 6 70 75 80 85 70 90 95 100 0 3 8 6 9 12 15 18 21 efficiency (%) power loss (w) dc2190a f04 efficiency 10 power loss 12
5 item qty reference part description manufacturer / part number dc2190a-a required circuit components 1 10 c1, c14, c15, c16, c17, c53, c54, c55, c61, c75 cap, 1812 2.2f 10% 100v x7r tdk c4532x7r2a225k 2 2 c2, c60 cap, 100f 20% 63v elec sun elect. 63ce100kx 3 2 c3, c49 cap, 0805 0.1f 10% 100v x7r tdk c2012x7r2a104k 4 2 c4, c64 cqp, 0805 4.7f 10% 16v x7r avx , 0805yc475 kat 2a 4 8 c 5, c 32, c 33, c 39, c 67, c 78, c 79, c 80 cap, 0603 0.1f 10% 50v x7r tdk c1608x7r1h104k 6 1 c6 cap, 0603 470pf 10% 50v x7r murata grm 188r71h471ka01d 7 1 c7 cap, 0603 10pf 5% 50v npo avx , 06035a100 jat 2a 8 3 c8, c46, c62 cap, 0603 47pf 5% 100v npo avx 06031a470 jat 2a 9 2 c9, c34 cap, 0603 10nf 10% 100v x7r avx , 06031c103 kat 2a 10 2 c11, c68 cap, 0603 0.1f 10% 100v x7r murata grm 188r72a104ka35d 11 4 c12, c13, c57, c63 cap, 0603 2.2pf 10% 100v npo avx , 06031a2r2 kat 2a 12 4 c18, c27, c59, c71 cap, 0603 1f 10% 16v x7r avx , 0603yc105 kat 2a 13 4 c20, c25, c73, c76 cap, 150f 20% 16v alum panasonic 16svpc150m 14 4 c22, c23, c66, c72 cap, 1206 10f 10% 16v x7r avx , 1206yc106 kat 2a 15 4 c30, c31, c51, c58 cap, 0603 0.22f 10% 25v x5r avx 06033d224 kat 2a 16 2 c35, c36 cap, 0603 1nf 10% 25v x7r avx 06033c102 kat 2a 17 1 c37 cap, 0603 100pf 10% 100v npo avx , 06031a101 kat 2a 18 2 c40, c100 cap, 33f 20% 63v elec sun elect., 63hvh 33m 19 1 c69 cap, 0603 4.7nf 10% 25v x7r avx , 06033c472 kat 2a 20 27 r7, r12, r16, r17, r18, r27, r28, r44, r45, r49, r51, r57, r60, r64, r67, r74, r76, r80, r81, c81, r82, c82, r83, r84, r85, r89, r90 res, 0603 0? jumper vishay crcw 06030000z0ea 21 4 l1, l2, l5, l6 ind, 10h coilcraft ser 2918h-103 22 8 q 1, q 2, q 3, q 4, q 17, q 20, q 22, q 24 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc123n08ns3 g 23 8 q 5, q 6, q 7, q 8, q 18, q 19, q 21, q 23 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc042ne7ns3 24 4 rs1, rs2, rs3, rs4 res, 2010 0.003? 1% 1w vishay wsl 20103l000fea18 25 2 r_prg1, r_prg res, 0603 29.4k 1% 1/10w vishay , crcw060329k4fkea 26 2 r1, r62 res. 1206 2.2? 1% 1/4w vishay crcw 12062r20fkea 27 1 r 8 res, 0603 100k 5% 1/10w vishay crcw 0603100kjnea 28 1 r9 res, 0805 499k 1% 1/8w vishay , crcw0805499kfkea 29 3 r10, r33, r37 res, 0603 10? 1% 1/10w vishay crcw 060310r0fkea 30 1 r11 res, 0603 35.7k 1% 1/10w vishay crcw 060335k7fkea 31 1 r14 res, 0603 1.5k 1% 1/10w vishay crcw 06031k50fkea 32 4 r19, r20, r63, r66 res, 0603 100? 5% 1/10w vishay , crcw0603100rjnea 33 2 r30, r48 res , 0603 90.9k 1% 1/10w vishay crcw 060390k9fkea 34 5 r32, r35, r38, r39, r40 res, 0603 10k 1% 1/10w vishay crcw 060310k0fkea 35 4 r34, r43, r52, r86 res, 2010 0.001?1% 1w vishay , wsl20101l000fea18 36 2 r36, r41 res, 0603 392k 1% 1/10w vishay crcw 0603392kfkea parts list dc2190a-a dc2190afa demo manual dc2190a-a/dc2190a-b
6 parts list dc2190a-a item qty reference part description manufacturer / part number 37 1 r42 res, 0603 3.3k 5% 1/10w vishay crcw 06033k30jnea 38 2 u1, u4 ic, dual output high voltage step-down converter linear tech. LTC3892EFE-1#pbf 39 0 c70 cap, 100f 20% 63 v elec option sun elect., 63ce100 kx option dc2190a-a additional demo board circuit components 40 1 u2 ic, high voltage bidirectional current sense amp linear tech. lt1999cs8-10#pbf 41 1 u5 ic, op amp, comparator and reference linear tech. ltc1541cms8#pbf 42 1 u6 ic, dual and quad, single supply , precision op amps linear tech. lt2078cs8#pbf 43 1 u7 ic, low power dual comparators with reference linear tech. ltc1843cs 8#pbf 44 1 u8 ic, multiphase oscillator with spread spectrum frequency modulation linear tech. ltc6902cms#pbf 45 0 q9, q10, q11, q12, q13, q14, q15, q16, q25, q26, q27, q28, q29, q30, q31, q32 xstr, mosfet option option 46 1 q33 xstr, small signal, npn diodes inc. mmbt3904 47 0 q34, r50, r59, r61 do not stuff none 48 0 r2, r3, r4, r5, r13, r21, r22, r23, r24, r25, r26, r29, r31, r46, r53, r54, r55, r56, r65, r71, r72, r73, r77, r78, r79 res, 0603 option option 49 0 d1, d2, d3 diode, schottky 30v, 100 ma option central semi cmdsh-3 -tr option 50 1 d4 diode, zener 5.1v diodes inc. mmsz5231bs 51 0 l3, l4, l7, l8 ind, option option 52 0 c28, c29, c45, c48, c50, c52, c56, c65, c77, c88, c89, c90, c91, c92, c93, c94, c95, c96, c97, c98, c99 cap, 0603 option option 53 0 c10, c19, c26, c38, c83, c84, c85, c86, c87 cap, 1210 option option 54 0 c21, c24, c41, c42, c43, c44, c47, c74 cap, 150f 20% 16 v alum option panasonic 16svpc150 m option 55 0 r47, r58 res, 0603 10k 1% 1/10 w option vishay crcw 060310k0 fkea option dc2190a-a hardware 56 5 e1, e2, e3, e4, e5 turret miil-max 2501-2-00-80-00-00-07-0 57 1 jp1 header, 3-pin, dbl row 2mm sullins, nrpn032 paen-rc 58 2 jp2, jp3 header, 2mm, 3-pin sullins, nrpn031 paen-rc 59 10 j1, j2, j3, j4, j5, j7, j8, j9, j12, j13 stud, testpin pem kfh-032-10 60 10 lug ring, #10 keystone 8205 61 3 xjp1, xjp2, xjp3 shunt, 2mm samtec 2sn-bk-g 62 10 washer , #10 tin plated brass any #10 ext bz tn 63 4 mh1, mh2, mh3, mh4 standoff , snap on keystone_8831 64 20 nut, brass 10-32 any #10-32 dc2190afa demo manual dc2190a-a/dc2190a-b
7 item qty reference part description manufacturer / part number dc2190a-b required circuit components 1 5 c1, c14, c15, c16, c17 cap, 1812 2.2f 10% 100v x7r tdk c4532x7r2a225k 2 1 c2 cap, 100f 20% 63v elec sun elect. 63ce100kx 3 1 c3 cap, 0805 0.1f 10% 100v x7r tdk c2012x7r2a104k 4 1 c4 cqp, 0805 4.7f 10% 16v x7r avx , 0805yc475 kat 2a 5 7 c5, c32, c33, c39, c78, c79, c80 cap, 0603 0.1f 10% 50v x7r tdk c1608x7r1h104k 6 1 c6 cap, 0603 470pf 10% 50v x7r murata grm 188r71h471ka01d 7 1 c7 cap, 0603 15pf 5% 50v c0g avx 06035a150 jat 4a 8 1 c8 cap, 0603 47pf 5% 100v npo avx 06031a470 jat 2a 9 2 c9, c34 cap, 0603 10nf 10% 100v x7r avx , 06031c103 kat 2a 10 1 c11 cap, 0603 0.1f 10% 100v x7r murata grm 188r72a104ka35d 11 2 c12, c13 cap, 0603 2.2pf 10% 100v npo avx , 06031a2r2 kat 2a 12 2 c18, c27 cap, 0603 1f 10% 16v x7r avx , 0603yc105 kat 2a 13 2 c20, c25 cap, 150f 20% 16v alum panasonic 16svpc150m 14 2 c22, c23 cap, 1206 10f 10% 16v x7r avx , 1206yc106 kat 2a 15 2 c30, c31 cap, 0603 0.22f 10% 25v x5r avx 06033d224 kat 2a 16 2 c35, c36 cap, 0603 1nf 10% 25v x7r avx 06033c102 kat 2a 17 1 c37 cap, 0603 100pf 10% 100v npo avx , 06031a101 kat 2a 18 2 c40, c100 cap, 33f 20% 63v elec sun elect., 63hvh33m 19 1 c69 cap, 0603 4.7nf 10% 25v x7r avx , 06033c472 kat 2a 20 19 r7, r12, r16, r17, r18, r27, r28, r44, r45, r49, r81, c81, r82, c82, r83, r84, r85, r89, r90 res, 0603 0? jumper vishay crcw 06030000z0ea 21 4 q1, q2, q3, q4 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc123n08ns3g 22 4 q5, q6, q7, q8 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc042ne7ns3 33 2 l1, l2 ind, 10h coilcraft ser 2918h-103 24 2 rs1, rs2 res, 2010 0.003? 1% 1w vishay wsl 20103l000fea18 25 1 r_prg res, 0603 29.4k 1% 1/10w vishay , crcw060329k4fkea 26 1 r1 res. 1206 2.2? 1% 1/4w vishay crcw 12062r20fkea 27 1 r8 res, 0603 100k 5% 1/10w vishay crcw 0603100kjnea 28 1 r9 res, 0805 499k 1% 1/8w vishay , crcw0805499kfkea 29 3 r10, r33, r37 res, 0603 10? 1% 1/10w vishay crcw 060310r0fkea 30 1 r11 res, 0603 35.7k 1% 1/10w vishay crcw 060335k7fkea 31 1 r14 res, 0603 4.02k 1% 1/10 w vishay crcw 06034k02fkea 32 2 r19, r20 res, 0603 100? 5% 1/10w vishay , crcw0603100rjnea 33 1 r30 res, 0603 90.9k 1% 1/10w vishay crcw 060390k9fkea 34 5 r32, r35, r38, r39, r40 res, 0603 10k 1% 1/10w vishay crcw 060310k0fkea 35 4 r34, r43, r52, r86 res, 2010 0.001? 1% 1w vishay , wsl20101l000fea18 36 2 r36, r41 res, 0603 392k 1% 1/10w vishay crcw 0603392kfkea 37 1 r42 res, 0603 3.3k 5% 1/10w vishay crcw 06033k30jnea 38 1 u1 ic, dual output high voltage step-down converter linear tech. LTC3892EFE-1#pbf parts list dc2190a-b dc2190afa demo manual dc2190a-a/dc2190a-b
8 item qty reference part description manufacturer / part number dc2190a-b additional demo board circuit components 39 0 c10, c19, c26, c38, c83, c84, c85, c86, c87 cap, 1210 option option 40 0 c28, c29, c56, c77, c88, c89, c90, c91, c92, c93 cap, 0603 option option 41 0 l3, l4, l7, l8 ind, option option 42 0 d1, d2, d3 diode, schottky 30v, 100 ma option central semi cmdsh-3 -tr option 43 1 d4 diode, zener 5.1v diodes inc. mmsz5231bs 44 0 c21, c24, c41, c42, c43, c44 cap, 150f 20% 16 v alum option panasonic 16svpc150 m option 45 0 q9, q10, q11, q12, q13, q14, q15, q16, q25, q26, q27, q28, q29, q30, q31, q32 xstr, mosfet option option 46 1 q33 xstr, small signal, npn diodes inc. mmbt3904-7-f 47 0 q34, r50, r59, r61 do not stuff none 48 0 r2, r3, r4, r5, r13, r21, r22, r23, r24, r25, r26, r29, r31, r46 res, 0603 option option 49 0 r47, r58 res, 0603 10k 1% 1/10 w option vishay crcw 060310k 0 fkea option 50 1 u2 ic, high voltage bidirectional current sense amp linear tech. lt1999cs8-10#pbf 51 1 u5 ic, micropower op amp, comparator and reference linear tech. ltc1541cms8#pbf 52 1 u6 ic, dual and quad, single supply, precision op amps linear tech. lt2078cs8#pbf 53 1 u7 ic, low power dual comparators with reference linear tech. ltc1843cs8#pbf 54 1 u8 ic, multiphase oscillator w/spread spectrum frequency modulation linear tech. ltc6902cms#pbf dc2190a-b hardware 55 7 washer , #10 tin plated brass any #10 ext bz tn 56 2 xjp1, xjp2 shunt, 2mm samtec 2sn-bk-g 57 4 mh1, mh2, mh3, mh4 standoff , snap on keystone_8831 58 14 nut, brass 10-32 any #10-32 59 5 e1, e2, e3, e4, e5 turret miil-max 2501-2-00-80-00-00-07-0 60 1 jp1 header, 3-pin, dbl row 2mm sullins, nrpn032 paen-rc 61 1 jp2 header, 2mm, 3-pin sullins, nrpn031 paen-rc 62 7 j1, j2, j3, j4, j5, j7, j8 stud, testpin pem kfh-032-10 63 7 lug ring, #10 keystone 8205 parts list dc2190a-b dc2190afa demo manual dc2190a-a/dc2190a-b
9 schematic diagram a a b b c c d d e e 4 4 3 3 2 2 1 1 burst ext. sync/p.s. int. sync ser2918h-103 ser2918h-103 sht 2 pcb no. sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 2 sht 2 sht 2 sht 2 sht 2 sht 2 sht 2 sht 3 sht 3 sns1+ sns2+ sw1 s1- run1 bg2 s2- tg2 ith1 tr/ss1 s1- s1+ s2+ s2- ith2 s2+ sw2 bg1 s1+ tg1 run2 vfb2 tr/ss2 sw2 tg2 bg2 sns2+ sns1+ sw1 tg1 bg1 vfb1 ith1 tr/ss1 run1 vfb1 vin vin vout intvcc vout intvcc vin intvcc vout intvcc vout intvcc vin vin ith sw2 tg2 bg2 sns2+ sns1+ sw1 tg1 bg1 vfb3 ith3 run3 tr/ss3 extvcc drvuv ph1 mode run1 vfb1 size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 friday, november 21, 2014 13 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 friday, november 21, 2014 13 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 friday, november 21, 2014 13 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply c27 1uf c3 0.1uf r1 2.2 1% c1 2.2uf 100v r82 0 q2 bsc123n08ns3 g 3 1 2 4 5 q8 bsc042ne7ns3 3 1 2 4 5 r30 90.9k 1% c5 0.1uf r22 opt c23 10uf r90 0 c13 2.2pf q3 bsc123n08ns3 g 3 1 2 4 5 r_prg 29.4k c88 opt q1 bsc123n08ns3 g 3 1 2 4 5 c18 1uf r21 opt r19 100 e2 gnd c29 opt r83 0 c90 opt jp1 mode 1 2 3 4 5 6 r10 10 1% c9 10nf l2 10uh r25 opt c7 10pf j4 vout 12v / 60a + c2 100uf 63v e3 drvuv c77 opt u1 LTC3892EFE-1 tk/ss1 28 ith1 1 vfb1 2 vfb2 12 ith2 13 tk/ss2 16 sense2- 10 sense2+ 11 run2 9 extvcc 22 drvuv 14 sw2 18 tg2 17 boost2 19 drvcc 21 bg2 20 intvcc 7 vbias 23 bg1 24 boost1 25 tg1 27 sw1 26 mode/pllin 6 freq 5 run1 8 sense1+ 3 sense1- 4 gnd 29 drvset 15 r8 100k + c100 33uf 63v r84 0 r17 0 + c25 150uf r12 0 r18 0 c22 10uf + c20 150uf j5 gnd c11 0.1uf c93 opt r23 opt + c21 opt r11 35.7k 1% r44 0 r14 1.5k 1% r45 0 r27 0 c12 2.2pf l1 10uh r16 0 c89 opt j3 vout 12v / 60a j2 gnd rs2 3m r13 opt r7 0 r24 opt e4 extvcc c6 470pf r46 opt r4 opt c15 2.2uf r28 0 j1 vin 16v up to 55v q6 bsc042ne7ns3 3 1 2 4 5 r20 100 c56 opt r26 opt c92 opt r2 opt r81 0 q7 bsc042ne7ns3 3 1 2 4 5 c31 0.22uf + c40 33uf 63v q5 bsc042ne7ns3 3 1 2 4 5 c4 4.7uf 16v c8 47pf c16 2.2uf 100v e1 sync jp2 on off run 1 3 2 r5 opt c14 2.2uf c30 0.22uf c28 opt rs1 3m + c24 opt c17 2.2uf 100v r9 499k 1% r29 opt c91 opt r89 0 r3 opt q4 bsc123n08ns3 g 3 1 2 4 5 dc2190afa demo manual dc2190a-a/dc2190a-b
10 a a b b c c d d e e 4 4 3 3 2 2 1 1 ser2918h-103 ser2918h-103 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 1 sht3 sht 1,3 sht 1,3 sht 1,3 sht 1,3 sht 1,3 sht 1,3 ith4 sw3 sns3+ s4+ s4- sw4 sns4+ sw4 tg4 bg4 s3- s3+ bg3 s3+ tg3 s4- sns4+ vfb4 tr/ss3 sns3+ sw3 tr/ss4 tg3 bg3 bg4 tr/ss3 s4+ s3- run3 run3 run4 tg4 ith3 vfb3 vfb3 ith3 vin vin vin vout vout intvcc2 intvcc2 intvcc2 vin sns3+ sw3 sns4+ sw4 tg4 bg4 tg3 bg3 extvcc drvuv run3 ith3 ph2 mode vfb3 tr/ss3 size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 23 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 23 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 23 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply c55 2.2uf 100v r74 0 r72 opt r54 opt c62 47pf c45 opt c97 opt r78 opt r65 opt r55 opt c98 opt c46 47pf rs4 3m c63 2.2pf r56 opt q17 bsc123n08ns3 g 3 1 2 4 5 c99 opt c50 opt c64 4.7uf 16v j13 gnd c71 1uf r62 2.2 1% j9 vout 12v / 60a r57 0 q20 bsc123n08ns3 g 3 1 2 4 5 c59 1uf + c47 opt r73 opt r79 opt c52 opt j12 vout 12v / 60a l6 10uh c67 0.1uf r_prg1 29.4k c57 2.2pf + c74 opt r51 0 r64 0 q23 bsc042ne7ns3 3 1 2 4 5 c68 0.1uf l5 10uh + c60 100uf 63v c51 0.22uf c53 2.2uf 100v rs3 3m c75 2.2uf r63 100 c49 0.1uf r60 0 r66 100 u4 LTC3892EFE-1 tk/ss1 28 ith1 1 vfb1 2 vfb2 12 ith2 13 tk/ss2 16 sense2- 10 sense2+ 11 run2 9 extvcc 22 drvuv 14 sw2 18 tg2 17 boost2 19 drvcc 21 bg2 20 intvcc 7 vbias 23 bg1 24 boost1 25 tg1 27 sw1 26 mode/pllin 6 freq 5 run1 8 sense1+ 3 sense1- 4 gnd 29 drvset 15 c58 0.22uf c72 10uf c65 opt r76 0 r67 0 + c76 150uf r71 opt r48 90.9k 1% q24 bsc123n08ns3 g 3 1 2 4 5 q18 bsc042ne7ns3 3 1 2 4 5 c94 opt c61 2.2uf jp3 ext./p.s. int. clk 1 3 2 r80 0 + c73 150uf c48 opt + c70 opt q22 bsc123n08ns3 g 3 1 2 4 5 c95 opt c54 2.2uf 100v q19 bsc042ne7ns3 3 1 2 4 5 q21 bsc042ne7ns3 3 1 2 4 5 r53 opt c66 10uf c96 opt r77 opt schematic diagram dc2190afa demo manual dc2190a-a/dc2190a-b
11 schematic diagram a a b b c c d d e e 4 4 3 3 2 2 1 1 sht1 charge/discharging current control sht1 sht1 sht1 sht1 sht1 sht1 sht2 sht2 sht2 sht2 sht2 sht2 sht2 sht2 input uv/ov protection sht1 sht1 charge/discharge mode fb switch over sht1 sht2 on board pwm generator this page is for bi-directional charger only. vin opt sht 1 sht 1 (optional) vcontrol sw3 sw4 sw1 sw2 vref vcontrol vcc vout intvcc vin vin vout vin vin vcc vin vcc intvcc vout vcc vcc vin intvcc ith sw2 tg2 bg2 sw1 tg1 bg1 sns3+ sns4+ sw4 sw3 tg3 tg4 bg3 bg4 vref run1 sns1+ sns2+ ph2 ph1 vfb1 size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 33 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 33 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 33 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-a step-down supply + c44 opt r32 10k 1% + c43 opt q15 opt 3 1 2 4 5 + c42 opt + c41 opt c10 opt 1210 r42 3.3k - + u6a lt2078cs8 1 2 3 4 8 q30 opt 3 1 2 4 5 c33 0.1uf r47 opt r34 1m c69 4.7nf l4 opt l7 opt c34 10nf r50 do not stuff q11 opt 3 1 2 4 5 r58 opt c83 opt 1210 c38 opt r39 10k 1% u8 ltc6902cms out4 7 6 out3 out2 5 out1 4 ph 3 div 2 v+ 1 gnd 8 mod 9 set 10 c86 opt 1210 j8 vbatt e5 refin r43 1m r33 10 1% d4 5.1v q34 do not stuff 3 1 2 d3 opt c32 0.1uf d2 opt c81 0 r40 10k 1% q32 opt 3 1 2 4 5 c39 0.1uf c19 opt 1210 c80 0.1uf c84 opt 1210 r52 1m q9 opt 3 1 2 4 5 q33 mmbt3904 r59 do not stuff q10 opt 3 1 2 4 5 q25 opt 3 1 2 4 5 c79 0.1uf q13 opt 3 1 2 4 5 c87 opt 1210 l3 opt c37 100pf l8 opt r86 1m d1 opt r41 392k 1% q16 opt 3 1 2 4 5 r49 0 c78 0.1uf c35 1nf r37 10 1% r36 392k 1% u7 ltc1843cs8 vcc 7 ref 6 hyst 5 inb- 4 ina+ 3 v- 2 outa 1 outb 8 q12 opt 3 1 2 4 5 q31 opt 3 1 2 4 5 q26 opt 3 1 2 4 5 q27 opt 3 1 2 4 5 u5 ltc1541cms8 compout 7 ref 6 compin+ 5 vss 4 ampin+ 3 ampin- 2 ampout 1 vcc 8 c26 opt 1210 q14 opt 3 1 2 4 5 r85 0 c36 1nf r31 opt r35 10k 1% c85 opt 1210 j7 vbatt r61 do not stuff r38 10k 1% - + u2 lt1999cs8-10 2 3 7 1 4 5 8 6 q28 opt 3 1 2 4 5 c82 0 q29 opt 3 1 2 4 5 dc2190afa demo manual dc2190a-a/dc2190a-b
12 schematic diagram a a b b c c d d e e 4 4 3 3 2 2 1 1 burst ext. sync/p.s. int. sync ser2918h-103 ser2918h-103 sht 2 pcb no. sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 3 sht 2 sht 2 sht 2 sht 2 sht 2 sht 2 sht 2 sht 3 sht 3 sns1+ sns2+ sw1 s1- run1 bg2 s2- tg2 ith1 tr/ss1 s1- s1+ s2+ s2- ith2 s2+ sw2 bg1 s1+ tg1 run2 vfb2 tr/ss2 sw2 tg2 bg2 sns2+ sns1+ sw1 tg1 bg1 vfb1 ith1 tr/ss1 run1 vfb1 vin vin vout intvcc vout intvcc vin intvcc vout intvcc vout intvcc vin vin ith sw2 tg2 bg2 sns2+ sns1+ sw1 tg1 bg1 vfb3 ith3 run3 tr/ss3 extvcc drvuv ph1 mode run1 vfb1 size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 12 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 12 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 12 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply c27 1uf c3 0.1uf r1 2.2 1% c1 2.2uf 100v r82 0 q2 bsc123n08ns3 g 3 1 2 4 5 q8 bsc042ne7ns3 3 1 2 4 5 r30 90.9k 1% c5 0.1uf r22 opt c23 10uf r90 0 c13 2.2pf q3 bsc123n08ns3 g 3 1 2 4 5 r_prg 29.4k c88 opt q1 bsc123n08ns3 g 3 1 2 4 5 c18 1uf r21 opt r19 100 e2 gnd c29 opt r83 0 c90 opt jp1 mode 1 2 3 4 5 6 r10 10 1% c9 10nf l2 10uh r25 opt c7 10pf j4 vout 12v / 60a + c2 100uf 63v e3 drvuv c77 opt u1 LTC3892EFE-1 tk/ss1 28 ith1 1 vfb1 2 vfb2 12 ith2 13 tk/ss2 16 sense2- 10 sense2+ 11 run2 9 extvcc 22 drvuv 14 sw2 18 tg2 17 boost2 19 drvcc 21 bg2 20 intvcc 7 vbias 23 bg1 24 boost1 25 tg1 27 sw1 26 mode/pllin 6 freq 5 run1 8 sense1+ 3 sense1- 4 gnd 29 drvset 15 r8 100k + c100 33uf 63v r84 0 r17 0 + c25 150uf r12 0 r18 0 c22 10uf + c20 150uf j5 gnd c11 0.1uf c93 opt r23 opt + c21 opt r11 35.7k 1% r44 0 r14 1.5k 1% r45 0 r27 0 c12 2.2pf l1 10uh r16 0 c89 opt j3 vout 12v / 60a j2 gnd rs2 3m r13 opt r7 0 r24 opt e4 extvcc c6 470pf r46 opt r4 opt c15 2.2uf r28 0 j1 vin 16v up to 55v q6 bsc042ne7ns3 3 1 2 4 5 r20 100 c56 opt r26 opt c92 opt r2 opt r81 0 q7 bsc042ne7ns3 3 1 2 4 5 c31 0.22uf + c40 33uf 63v q5 bsc042ne7ns3 3 1 2 4 5 c4 4.7uf 16v c8 47pf c16 2.2uf 100v e1 sync jp2 on off run 1 3 2 r5 opt c14 2.2uf c30 0.22uf c28 opt rs1 3m + c24 opt c17 2.2uf 100v r9 499k 1% r29 opt c91 opt r89 0 r3 opt q4 bsc123n08ns3 g 3 1 2 4 5 dc2190afa demo manual dc2190a-a/dc2190a-b
13 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 . schematic diagram a a b b c c d d e e 4 4 3 3 2 2 1 1 sht1 charge/discharging current control sht1 sht1 sht1 sht1 sht1 sht1 sht2 sht2 sht2 sht2 sht2 sht2 sht2 sht2 input uv/ov protection sht1 sht1 charge/discharge mode fb switch over sht1 sht2 on board pwm generator this page is for bi-directional charger only. vin opt sht 1 sht 1 (optional) vcontrol sw3 sw4 sw1 sw2 vref vcontrol vcc vout intvcc vin vin vout vin vin vcc vin vcc intvcc vout vcc vcc vin intvcc ith sw2 tg2 bg2 sw1 tg1 bg1 sns3+ sns4+ sw4 sw3 tg3 tg4 bg3 bg4 vref run1 sns1+ sns2+ ph2 ph1 vfb1 size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 22 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 22 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply size date: ic no. rev. sheet of title: approvals pcb des. app eng. 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. scale = none www.linear.com 2 monday, november 24, 2014 22 high power 60v, 4-phase synchronous ` \ ding l. n/a LTC3892EFE-1 demo circuit 2190a-b step-down supply - + u6a lt2078cs8 1 2 3 4 8 r42 3.3k c10 opt 1210 + c41 opt + c42 opt q15 opt 3 1 2 4 5 + c43 opt r32 10k 1% + c44 opt r34 1m r47 opt c33 0.1uf q30 opt 3 1 2 4 5 q11 opt 3 1 2 4 5 r50 do not stuff c34 10nf l7 opt l4 opt c69 4.7nf r39 10k 1% c38 opt c83 opt 1210 r58 opt e5 refin j8 vbatt c86 opt 1210 u8 ltc6902cms out4 7 6 out3 out2 5 out1 4 ph 3 div 2 v+ 1 gnd 8 mod 9 set 10 r43 1m q34 do not stuff 3 1 2 r33 10 1% d4 5.1v q32 opt 3 1 2 4 5 r40 10k 1% c81 0 d2 opt c32 0.1uf d3 opt c19 opt 1210 c80 0.1uf c39 0.1uf c79 0.1uf q25 opt 3 1 2 4 5 q10 opt 3 1 2 4 5 r59 do not stuff q9 opt 3 1 2 4 5 q33 mmbt3904 r52 1m c84 opt 1210 c87 opt 1210 q13 opt 3 1 2 4 5 c35 1nf c78 0.1uf r49 0 q16 opt 3 1 2 4 5 r41 392k 1% d1 opt r86 1m l8 opt c37 100pf l3 opt u7 ltc1843cs8 vcc 7 ref 6 hyst 5 inb- 4 ina+ 3 v- 2 outa 1 outb 8 r36 392k 1% r37 10 1% q27 opt 3 1 2 4 5 q26 opt 3 1 2 4 5 q31 opt 3 1 2 4 5 q12 opt 3 1 2 4 5 r85 0 q14 opt 3 1 2 4 5 c26 opt 1210 u5 ltc1541cms8 compout 7 ref 6 compin+ 5 vss 4 ampin+ 3 ampin- 2 ampout 1 vcc 8 j7 vbatt c85 opt 1210 r35 10k 1% r31 opt c36 1nf q29 opt 3 1 2 4 5 c82 0 q28 opt 3 1 2 4 5 - + u2 lt1999cs8-10 2 3 7 1 4 5 8 6 r38 10k 1% r61 do not stuff dc2190afa demo manual dc2190a-a/dc2190a-b
14 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2015 lt 0516 rev a ? printed in usa 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 whatsoeve r . 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 dc2190afa demo manual dc2190a-a/dc2190a-b

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