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1 dc1822af demo manual dc1822a description LTC3861EUHE high current, dual output synchronous buck converter demonstration circuit 1822a is a dual output synchronous buck converter featuring the ltc ? 3861euhe. the board provides two outputs of 1.5v/25a and 1.2v/25a from an input voltage of 7v to 14v at a switching frequency of 500khz. the power stage consists of a 6mm 6mm drmos and a 13mm 13mm iron powder type inductor. an on-board 5v lt ? 3470 buck regulator provides the 5v bias for the ltc3861 and the drmos. the demo board uses a high density, two sided drop-in layout. the power components, excluding the bulk output and input capacitors, fit within a 1.5" 1.2" area on the top layer. the control circuit fits in a 1.1" 1.0" area on the bottom layer. the package style for the LTC3861EUHE is a 36-lead 5mm 6mm qfn. l , lt, ltc, ltm, module, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. p erformance s ummary the main features of the board are: ? remote sensing for each output, where the divider is placed before a high input impedance differential amplifier. ? clkin and clkout pins. ? optional resistors to tie the two outputs together . ? connector and header to tie two or more boards together for up to 12-phase operation. ? optional footprint for an ltc4449 gate driver and discrete mosfets. ? optional footprint for a dual phase delta power block. design files for this circuit board are available at http://www.linear.com/demo (t a = 25c), no airfow parameter condition value minimum input v oltage 7v maximum input v oltage 14v output voltage v out1 i out1 = 0a to 25a, v in = 7v to 14v 1.5v 2% output voltage v out2 i out2 = 0a to 25a, v in = 7v to 14v 1.2v 2% v out1 maximum output current, i out1 v in = 7v to 14v, v out1 = 1.5v 25a v out2 maximum output current, i out2 v in = 7v to 14v, v out2 = 1.2v 25a nominal switching frequency 500khz efficiency (see figures 2 and 3) v out1 = 1.5v, i out1 = 25a, v in = 12v 91.6% t ypical v out2 = 1.2v, i out2 = 25a, v in = 12v 90.7% t ypical
2 dc1822af demo manual dc1822a quick s tart p roce d ure figure 1. proper measurement equipment setup demonstration circuit 1822a is easy to set up to evaluate the performance of the LTC3861EUHE. please refer to figure 1 for proper measurement equipment setup and follow the procedure below. 1. with power off, connect the input supply, load and meters, as shown in figure 1. preset the load to 0a and v in supply to be 0v. place jumpers in the following positions: jp1 run1 on jp2 run2 on jp3 int bias on 2. adjust the input voltage to be between 7v to 14v. v out1 should be 1.5v 2%.vout2 should be 1.2v 2%. 3. next, apply 25a load to each output and re-measure vout. 4 . once the dc regulation is confirmed, observe the output voltage ripple, load step response, efficiency and other parameters. note 1. use the bnc connectors labeled vout1 or vout2 to measure the output voltage ripple. note 2. do not apply the load from the vos1+ turret to the vos1C turret or from the vos2+ turret to the vos2C turret. these are connected to the sense traces for the output voltage. heavy load currents applied across these turrets may damage these traces. v in supply v out1 * i in a a a v v v + ? + ? v out2 * v out2 load v out1 load i out2 i out1 + ? v in + ? dc1822a f01 monitor voltage across c out5 and c out10 for accurate ef?ciency measurements. + ? + ?
3 dc1822af demo manual dc1822a q uick start proce d ure figure 2. efficiency curves for the 1.5v rail of the dc1822a. f sw = 500khz with the fdmf6820a drmos figure 3. efficiency curves for the 1.2v rail of the dc1822a. f sw = 500khz with the fdmf6820a drmos dynamic load circuit (optional) 1. preset the amplitude of a pulse generator to 0.0v and the duty cycle to 5% or less. 2. connect the scope to the vout bnc connectors for the rail under test with a coax cable. to monitor the load step current, connect the scope probe across the istep turrets for that rail. 3. connect the output of the pulse generator to the pulse gen turret for the rail under test and connect the return to one of the gnd turrets. 4. with the converter running, slowly increase the ampli- tude of the pulse generator output to provide the desired load step pulse height. the scaling for the load step signal is 10mv/amp. see figures 4 and 5 for transient response curves with a 50% load change. 70 75 80 85 90 95 0 5 10 15 20 25 30 ef?ciency (%) load current (amps) v in = 7v v in = 12v v in = 14v parameters and conditions: r boost = 2.2 l = wrth 744355147 (0.47h, dcr = 0.67m 10%) external 5v bias applied power from the external 5v bias included in the ef?ciency measurements 1.2v rail disabled no air?ow dc1822a f02 (r2, r25) dc1822a f03 70 75 80 85 90 95 0 5 10 15 20 25 30 ef?ciency (%) load current (amps) v in = 7v v in = 12v v in = 14v parameters and conditions: r boost = 2.2 l = wrth 744355147 (0.47h, dcr = 0.67m 10%) external 5v bias applied power from the external 5v bias included in the ef?ciency measurements 1.5v rail disabled no air?ow (r2, r25)
4 dc1822af demo manual dc1822a single output /dual phase operation a single output /dual phase converter may be preferred for higher output current applications. the optional com- ponents required to tie the phases together are found on the bottom of the schematic shown in figure 8. to tie the two outputs together, make the following modifications: 1. stuff 0 at r36 and r47 to tie the two outputs together. 2. select one rail to be the master. ? if vout1 is the master, then stuff 0 at r51 to disable the error amplifier for phase 2. also stuff 0 at r52. ? if vout2 is the master, then stuff 0 at r49 to disable the error amplifier for phase 1. also stuff 0 at r50. 3. remove the 0 jumper at r13 and stuff a 100pf capacitor at c14 for the ia vg signal. 4. stuff 0 at r53, r48 and r54 to tie the comp, trk/ss and run pins together . 5. remove the redundant compensation components. p aralleling boards the dc1822a demo boards can be tied together to form a converter with up to 12 phases. to tie the boards together, place the boards side-by-side and then connect the boards by connecting j8 of one board to j9 of the other. this will connect the iavg, comp, trk/ss and signal ground signals together . next, use copper strips to tie the vout planes, the vin planes and gnd planes of the two adjacent boards together. the board has exposed copper along the edges of the board for this purpose. figure 6 shows how to set up a 4-phase converter and figure 7 shows how to set up a 3-phase plus single phase converter. figure 4. load step response of the dc1822a 1.5v rail at v in = 12v. c out = 3 sanyo 2r5tpe330m9 || 2 100f x5r 6.3v 1210, l = 0.47h, f sw = 500khz figure 5. load step response of the dc1822a 1.2v rail at v in = 12v. c out = 3 sanyo 2r5tpe330m9 || 2 100f x5r 6.3v 1210, l = 0.47h, f sw = 500khz q uick start proce d ure 1.5vo(ac) 50mv/div load step 5a/div dc1822a f04 20s/div 12.5a 25a 88mv 1.2vo(ac) 50mv/div load step 5a/div dc1822a f05 20s/div 12.5a 25a 91mv
5 dc1822af demo manual dc1822a q uick start proce d ure cu cu board 1?top layer board 2?top layer note: tie gnd shapes together on the bottom layer by using the exposed copper along the edge of the board. vout vout vin vin vout vout vin r50 r17 r52 r24 r49 r51 r48 r53 r54 r41 r42 c14 r13 fb1 t o vcc iavg pin ilim2 r ilim2 t o vcc ilim1 r r36 & r47 vout1 t o vout2 trk/ss1 to trk/ss2 comp1 to comp2 run1 t o run2 ilim1 t o vcc fb2 t o vcc phase mode setting board #1 0.0m ns stuff 0 ns ns 0 0 0 0 ns ns 100pf ns board #2 0.0m ns stuff 0 ns 0 0 0 0 0 ns ns 100pf ns dc1822a f06 figure 6. setup of a 4-phase converter; phase 1 of board 1 is the master
6 dc1822af demo manual dc1822a q uick start proce d ure note: tie gnd shapes together on the bottom layer by using the exposed copper along the edge of the board. r50 r17 r52 r24 r49 r51 r48 r53 r54 r41 r42 c14 r13 fb1 t o vcc iavg pin ilim2 r ilim2 t o vcc ilim1 r r36 & r47 vout1 t o vout2 trk/ss1 to trk/ss2 comp1 to comp2 run1 t o run2 ilim1 t o vcc fb2 t o vcc phase mode setting board #1 0.0m ns stuff 0 ns ns 0 0 0 0 ns ns 100pf ns board #2 ns ns stuff ns stuff 0 ns ns ns ns 0 ns 100pf ns cu cu triple phase rail single phase rail vout1 vout1 vin vin vout1 vout2 vin dc1822a f07 board 1?top layer board 2?top layer figure 7. setup of a 3-phase plus single phase converter; phase 1 of board 1 is the master of the 3-phase rail
7 dc1822af demo manual dc1822a p arts list item qty reference part description manufacturer/part number dc1822a required circuit components 1 4 c1, c7, c8, c9 cap , 0.22f , 10%, 25v , x7r, 0603 a vx 06033c224ka t2a 2 2 c1-1, c1-2 cap, 1500pf, 10%, 50v, gog, 0603 murata,grm1885c1h152ja01d 3 2 c2-1, c2-2 cap, 100pf, 5%, 25v, npo, 0603 avx 06033a101jat2a 4 2 c28, c29 cap , 10f , 20%, 6.3v , x5r, 0805 a vx 08056d106mat2a 5 4 c3, c11, c34, c35 cap, 2.2f , 10%, 16v , x7r, 0603 mura ta grm188r61c225ke15d 6 2 c3-1, c3-2 cap, 3300pf , 10%, 50v x7r, 0603 a vx 06035c332ka t2a 7 1 c6 cap, 1 f, 20%, 25v , x5r, 0603 a vx 06033d105mat2a 8 1 cin2 cap, 180f, 20%, 16v, oscon sanyo 16svp180mx 9 4 cin3, cin4, cin5, cin6 cap , 22f , 20%, 16v , x5r, 1210 a vx 1210yd226mat2a 10 6 cout1-cout3, cout6-cout8 cap, 330f, 20%, 2.5v poscap 7343 sanyo 2r5tpe330m9 11 4 cout4, cout5, cout9, cout10 cap, 100f , 20%, 6.3v , x5r, 1210 a vx 12106d107mat2a 12 2 l1,l2 ind, 0.47h, 20% wur th 744355147 13 2 r1, r45 res, 18.2k, 1%, 1/10w , 0603 visha y crcw060318k2fkea 14 4 r11, r18, r39, r43 res, 10, 1%, 1/10w , 0603 visha y crcw060310r0fkea 15 2 r17, r24 res, 53.6k, 1%, 1/10w , 0603 visha y crcw060353k6fkea 16 2 r2, r25 res, 2.2, 1%, 1/16w , 0603 visha y crcw06032r20fkea 17 2 r20, r38 res, 2.87k, 1%, 1/10w , 0603 visha y crcw06032k87fkea 18 1 r2-1 res, 9.76k, 1%, 1/16w , 0603 visha y crcw06039k76fkea 19 1 r2-2 res, 9.31k, 1%, 1/16w , 0603 visha y crcw06039k31fkea 20 3 r3, r16, r26 res, 1, 1%, 1/10w , 0603 y ageo rc0603fr-071rl 21 2 r3-1, r3-2 res, 280, 1%, 1/10w , 0603 visha y crcw0603280rfkea 22 1 r37 res, 34k, 1%, 1/10w , 0603 visha y crcw060334k0fkea 23 2 r8, r44 res, 100k, 1%, 1/10w , 0603 visha y crcw0603100kfkea 24 9 r9, r12, r13, r19, r21-r23, r32, r73 res, 0, jumper, 0603 visha y crcw06030000z0ea 25 11 rb-1, rb-2, r t-2, r1-1, r1-2, r4-r6, r29, r30, r46 res, 10k, 1%, 1/10w , 0603 visha y crcw060310k0fkea 26 1 rt- 1 res, 15k, 1%, 1/10w , 0603 y ageo rc0603fr-0715kl 27 1 u1 i.c., l tc3861euhe linear tech. l tc3861euhe#pbf 28 2 u2, u3 mosfet, drmos, dc-dc, 3.3v, pwm fairchild fdmf6820a additional circuit components 1 1 c17 cap, 0.22f , 10%, 25v , x7r, 0603 a vx 06033c224ka t2a 2 1 c18 cap, 1 f, 20%, 25v , x5r, 0603 a vx 06033d105mat2a 3 1 c19 cap, 22f , 20%, 16v , x5r, 1210 a vx 1210yd226mat2a 4 2 c2, c4, c5, c10, c12-c16, c20, c22-c25, c27, c30-c33 cap, 0603 opt 5 1 c21 cap, 22pf, 10%, 25v, npo, 0603 avx 06033a220ka t2a 6 1 c26 cap, 1 f, 20%, 25v , x5r, 0603 a vx 06033d105mat2a 7 0 cin1 cap, svp, f8 opt 8 0 cin7-cin14, cout11-cout17 cap , 1210 opt 9 0 cout15-cout17, cout22-cout24 cap, 7343 opt 10 0 d1 diode, ba v170, sot23 o pt
8 dc1822af demo manual dc1822a parts l ist item qty reference part description manufacturer/part number 11 0 d2, d3 cmdsh-3 opt 12 1 l3 ind, 33h, C53dlc toko a914by w-330m=p3 13 0 l4 inductor, C53ldc o pt 14 0 pb1 dc/dc converters, d12s1r845a o pt 15 2 q1, q2 mosfet, 30v n-channel, dp ak vishay sud50n03-12p-e3 16 0 q3, q4, q7, q8 bsc050ne2ls opt 17 0 q5, q6, q9, q10 bsc010ne2ls o pt 18 0 r10, r14, r15, r27, r28, r31, r33-r35, r41, r42, r47-r55, r62, r64-r67, r69, r71, r72, r74-r81 res, 0603 o pt 19 2 r56, r58 res, 10k, 1%, 1/10w , 0603 visha y crcw060310k0fkea 20 2 r57, r60 res, 0.010, 1%, 1w , 2010 irc lrc-lrf2010lf-01-r010-f 21 1 r59 res, 0, jumper, 1206 vishay crcw12060000z0ea 22 1 r61 res, 604k, 1%, 1/16w , 0603 visha y crcw0603604kfkea 23 1 r63 res, 200k, 1%, 1/16w , 0603 visha y crcw0603200kfkea 24 1 u4 buck regula tor, l t3470ets8 linear technology l t3470ets8 25 0 u5 buck regula tor, l t3470ets8 opt 26 0 u8, u9 n-channel mosfet driver, l tc4449 opt hardware 1 27 e1-e27 testpoint, turret , 0.095" mill-max 2501-2-00-80-00-00-07-0 2 6 j1-j6 stud, test pin pem kfh-032-10 3 12 j1-j6 nut, brass pl #10-32 any #10-32m/s 4 6 j1-j6 ring, lug #10 keystone 8205 5 6 j1-j6 washer, tin, pla ted brass any 6 2 j7, j10 con, bnc, 5 pins connex 112404 7 1 j8 header, dobl row , r t angle, 24, 8 pin mill-max 802-10-008-20-001000 8 1 j9 socket, dbl row , r t angle, 24, 8 pin mill-max 803-43-008-20-001000 9 4 jp1, jp2, jp3, jp4 header, 3 pin, 0.079" single row samtec tmm-103-02-l-s 10 4 mtgs a t 4 corners st and-off, nylon 0.5" keystone 8833 (snap-on) 11 4 xjp1, xjp2, xjp3, xjp4 shunt, 0.079" center samtec 2sn-bk-g
9 dc1822af demo manual dc1822a s chematic diagram figure 8. dc1822a demo circuit schematic a a b b c c d d e e 4 4 3 3 2 2 1 1 ???????????????????????? ????????????????????????????????????????????????????????????? ?????????????????????????? ? ?????????? ???????? ????? ??? ?????? ??? ???? ??? ????? ????? ????? ????? ???? ????? ????? ??? ????? ??? ????? ??? ???? ????? ?????? ????? ??? ??????? ??? ??? ????? ??????? ??? ??? ??? ????? ??????? ??? ????? ??? ????? ??? ?????? ??????? ????? ????? ????? ????? ????? ???? ???? ??????? ??????? ????? ????? ????? ????? ???? ???? ??? ????? ??? ??? ????? ????? ???? ?????? ????? ??? ??? ??? ????? ????? ??? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? 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??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ???????????????????? ?? ????????????????????????? ???? ??????? ??? ??????????? ?????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ???????????????????? ?? ????????????????????????? ???? ??????? ??? ??????????? ?????????????????? ???????????????? ??????????? ???? ???????? ??? ??? ??????? ?? ???????????????? ??????????? ???? ???????? ??? ??? ??????? ?? ???????????????? ??????????? ???? ???????? ??? ??? ??????? ?? ?? ??? ?? ??? ????? ????? ?? ????? ?? ????? ????????? u2 ?? ????????? u2 ?? ????? ? ???? ? ???? ? ???? ? ???? ? ?? ? ????? ? ?? ? ??? ? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ?? ?? ???? ?? ???? ?? ????? ?? ??? ?? ???? ?? ??? ?? ??? ?? ???? ???? ??? ???? ???? ???? ??? ???? ???? ??? ???? ??? ?? ??????????? ?? ??????????? ????? ? ?????? ? ?????? ? ???????? ? ???????? ? ?????? ? ?????? ? ????? ? ????? ?? ???? ?? ???? ?? ?????? ?? ?????? ?? ?????? ?? ???? ?? ????? ?? ???? ?? ???? ?? ?????? ?? ????? ?? ?????? ?? ????? ?? ?????? ?? ?????? ?? ?????? ?? ?????? ?? ?????? ?? ?????? ?? ????????? ?? ??? ?? ??? ? ??? ?? ???? ?? ???? ?? ???? ?? ????????? ?? ??? ?? ???? ????? ???? ????? ??? ?? ??? ???? ??? ?? ??? ???? ? ? ? ??? ? ??? ? ??? ??? ??? ??? ?? ? ?? ? + ????? + ????? ??? ??? ??? ??? ??? ??? ??? ??? ?? ?????? ????????? ????????? ?? ?????? ????????? ????????? ?? ?????? ?? ?????? ????????? ?? ????????? ?? ????? ? ???? ? ???? ? ???? ? ???? ? ?? ? ????? ? ?? ? ??? ? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ???? ?? ?? ?? ???? ?? ???? ?? ????? ?? ??? ?? ???? ?? ??? ?? ??? ?? ??? ??? ??? ??? ?? ??? ?? ??? ??? ????? ?? ??? ????? ?? ????? ????? ???? ???? ????? ????? ???? ???? ???? ????? ???? ????? ??? ?????? ??? ?????? ??? ????? ?? ??? ????? ?? ?? ????? ?? ????? ?????? ?????? ?? ????? ?? ????? + ???? ??? ?????? + ???? ??? ?????? ??? ? ??? ? ??? ??? ??? ??? ????? ????? ???? ???? ????? ????? ???? ???? ??? ??? ??? ??? + ????? + ????? ??? ????? ?? ??? ????? ?? ??? ??? ??? ??? ??? ?????? ??? ?????? ?? ????? ??? ?? ????? ??? ??? ??? ??? ??? ???? ????? ???? ????? ??? ??? ??? ??? ?? ??? ?? ?? ??? ?? ??? ??? ??? ??? ??? ????? ?? ??? ????? ?? ??? ??? ??? ??? ??? ????? ??? ??? ????? ??? ??? ????? ??? ??? ????? ??? ??? ??? ??? ??? ??? ?? ??? ?? + ????? ????? ???? + ????? ????? ???? ??? ??? ??? ??? ??? ? ??? ? ??? ??? ??? ??? ???? ????? ???? ????? ??? ??? ??? ??? ?? ??? ?? ??? ?? ? ?? ? ??? ????? ?? ??? ????? ?? ?? ??? ?? ??? ???? ????? ???? ????? ??? ????? ?? ??? ????? ?? ?? ??? ?? ??? ?? ?????? ?????????? ?? ?????? ?????????? ?? ????? ?? ????? ??? ?? ??? ?? ??? ??? ??? ??? ?? ?????? ?? ?????? ??? ???? ??? ??? ???? ??? ?? ???? ?? ???? ??? ??? ??? ??? ??? ??? ???? ??? ??? ???? ?? ?????? ?? ?????? ?? ?????? ?? ?????? ???? ??? ???? ??? ???? ????? ???? ????? ?? ??? ?? ??? ??? ??? ??? ??? + ????? + ????? ??? ??? ??? ??? ??? ??? ??? ??? ?? ?????? ?? ?????? ?? ????????? ?? ????????? ???? ???? ??? ???? ???? ???? ??? ???? ??? ??? ??? ??? ??? ? ??? ? ???? ????? ???? ????? ???? ??? ???? ??? ?? ??? ?? ??? ??? ? ??? ? ??? ??? ??? ??? ??? ? ??? ? ?? ?????? ????????? ????????? ?? ?????? ????????? ????????? ?? ??? ?? ??? ?? ?????? ?????????? ?? ?????? ?????????? + ????? + ????? ??? ? ??? ? ??? ??? ??? ??? ??? ?? ??? ?? ??? ?? ??? ???? ??? ?? ??? ???? ? ? ? ?? ????? ?? ????? ?? ?????? ?? ?????? ??? ? ??? ? ???? ???? ??? ???? ???? ???? ??? ???? + ????? ????? ???? + ????? ????? ???? ???? ????? ???? ????? + ???? ????? ??? + ???? ????? ??? ??? ?? ??? ?? ?? ?????? ?? ?????? ?? ????????? ?? ????????? ??? ???? ??? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?? ???? ???????? ?? ???? ???????? ??? ? ??? ? ???? ????? ???? ????? ?? ???? ?? ???? ?? ???? ?? ???? ???? ????? ???? ????? ??? ??? ??? ??? ???? ???? ??? ???? ???? ???? ??? ???? ???? ????? ???? ????? ??? ????? ??? ??? ????? ??? ??? ? ??? ? ???? ????? ???? ????? ??? ????? ??? ????? ??? ??? ?? ??? ??? ?? ??? ??? ??? ??? ?? ???? ?? ???? ???? ????? ???? ?????
10 dc1822af demo manual dc1822a s chematic diagram figure 9. dc1822a demo circuit schematic a a b b c c d d e e 4 4 3 3 2 2 1 1 ?????????????????????????????? ????????? ?????????? ?????????????????????????????? ????????? ?????????? ????????????????????????????????? ???????????? ???????????????????????????????????????????????????? ??????????? ?????? ?????????????????? ?????????? ???????????????????????????????????? ?????????? ????? ???????????????? ????????????????? ???????????????????? ?????????????????????????? ????? ???????????????? ????????????????? ????? ???????????????? ????????????????? ????? ????? ???? ??????? ????? ???? ????? ????? ?????? ????? ???? ?????? ????? ???? ??????? ??? ?????? ???? ??? ?????? ?????? ?????? ??? ?????? ????? ????? ????? ????? ????? ????? ???? ???? ????? ????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? 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??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ????????????????????????? ?? ????????????????????????? ???? ??????? ??? ??????????? ?????????????????? ??? ??? ??? ??? ??? ??? ??? ??? ???? ???? ??? ???? ???? ???? ??? ???? ??? ???????? ??? ???????? ??? ? ??? ? ??? ??????? ??? ??????? ??? ? ???? ??? ? ???? ??? ????? ?? ???? ??? ????? ?? ???? ?????? ????? ???? ???? ?????? ????? ???? ???? ??? ??? ??? ??? ?? ???? ?? ???? ??? ???? ??? ???? + ?????? ????? ???? + ?????? ????? ???? ??? ??????? ??? ??????? + ?????? ????? ???? + ?????? ????? ???? ?????? ????? ???? ???? ?????? ????? ???? ???? ??? ?????? ??? ?????? ??? ???? ??? ???? ???? ???? ??? ???? ???? ???? ??? ???? ??? ???? ??? ???? ??? ?????????? ??? ?????????? ??? ??? ??? ??? ??? ??? ?? ??? ??? ?? ??? ??? ??? ??? ??? ??? ??? ??? ?? ?????????? ?? ?????????? ?? ? ?? ? ???? ? ?? ? ??? ? ????? ? ??? ? ???? ? ?? ???????????? ?? ???????????? ??? ???? ??? ???? ??? ???? ??? ???? ??? ???? ???? ??? ???? ???? ??? ??? ?? ??? ??? ?? ??? ??? ??? ??? ??? ?????? ??? ?????? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?????? ??? ??? ?????? ??? ??? ???? ??? ???? ??? ??????? ??? ??????? ??? ? ???? ??? ? ???? ??? ??? ??? ??? + ?????? ????? ???? + ?????? ????? ???? ??? ?????????? ??? ?????????? ???? ???? ??? ???? ???? ???? ??? ???? ?? ?????????? ?? ?????????? ?? ? ?? ? ???? ? ?? ? ??? ? ????? ? ??? ? ???? ? ??? ??? ??? ??? ??? ?? ??? ???????? ??? ?? ??? ???????? ? ? ? ?? ???? ?? ???? + ?????? ????? ???? + ?????? ????? ???? ??? ? ??? ? ??? ??? ??? ??? ?????? ????? ???? ???? ?????? ????? ???? ???? ????? ???? ??? ???? ????? ???? ??? ???? ?? ?????? ????? ?? ?????? ????? ? ? ? + ?????? ????? ???? + ?????? ????? ???? ????? ??? ????? ??? ??? ???? ??? ???? ??? ??? ??? ??? ??? ? ??? ? ??? ??????? ??? ??????? ??? ????? ?? ???? ??? ????? ?? ???? ????? ?? ????? ?? ?? ???????????? ?? ???????????? ?? ???????????????????? ????????? ?? ???????????????????? ????????? ???? ? ????? ? ????????? ? ???? ? ???? ? ???? ? ???? ? ????? ? ?? ???????????????????? ????????? ?? ???????????????????? ????????? ???? ? ????? ? ????????? ? ???? ? ???? ? ???? ? ???? ? ?????? ? ??? ?????? ??? ?????? + ?????? ????? ???? + ?????? ????? ???? ??? ?? ??? ???????????? ??? ?? ??? ???????????? ? ? ? ?????????? ??? ???????????????? ?????????? ??? ???????????????? ??? ? ???? ? ???? ? ???? ?? ????? ? ???? ? ??? ? ????? ? ??? ? ???? ? ??? ?? ???? ?? ???? ?? ???? ?? ????? ?? ????? ?? ??? ? ??? ? ??? ???????????? ??? ???????????? ??? ???? ??? ???? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?????? ??? ??? ?????? ??? ??? ??? ??? ??? ??? ?????? ??? ?????? ??? ????? ???? ??? ????? ???? ??? ???? ???? ??? ???? ???? ?????? ????? ???? ???? ?????? ????? ???? ???? ??? ???? ??? ???? ??? ???? ??? ????
11 dc1822af demo manual dc1822a 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. s chematic diagram figure 2. proper measurement equipment setup figure 10. dc1822a demo circuit schematic
12 dc1822af demo manual dc1822a linear technology corporation 1630 mccarthy bl vd., mi lpitas, ca 95 035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2012 lt 0612 ? printed in usa demonstration board important notice linear technology corporation (l tc) 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 ev aluation 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 warrant y is the exclusive warrant y made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or sta tutory, including any warrant y of merchantabilit y or fitness for any par ticular purpose. except to the extent of this indemnity , neither par ty shall be liable to the other for any indirect , special, incident al, 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 users 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 applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear t echnology corporation

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