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1 description lt c3871 high power polyphase ? bi-directional supply/charger demonstration circuit 2348a is a high power high efficiency bi-directional synchronous buck or boost converter featuring the lt c ? 3871 and is available in two versions. the dc2348 a-a operates with two each LTC3871 devices with four phases and the dc2348a-b utilizes one LTC3871 device with two phases. when operating in buck mode, this demo circuit has an input voltage range of 30v to 75v and produces a 12v output. when operating in boost mode, the input voltage is from 10v to 13v and produces a 48v output voltage. both boards have a switch that allows the converter to run in either buck or boost mode. a dc voltage source can be connected to the setcur turret to set the average inductor current in each phase of the converter. both boards also utilize a mode jumper to select for ced continuous conduction mode, buck-mode only pulse-skipping or full pulse-skipping mode for buck and boost. l , lt, ltc, ltm, linear technology, polyphase 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 synchronization to an external clock (frequency range 100 khz to 300 khz) is also possible on these boards. the demo circuit senses inductor current with a sense resistor. an optional dcr sense circuit utilizes the inductors dcr as the current sensing element further saving cost, footprint and improving efficiency . the LTC3871 data sheet gives a complete description of the parts operation and application information and must be read in conjunction with this quick start guide. design files for this circuit board are available at http://www.linear.com/demo/dc2348a dc2348a-a (4-phase) buck mode symbol parameter conditions min typ max units v high supply range 30 75 v v low output voltage 11.8 12 12.2 v output current 60 a f sw operating frequency 110 khz efficiency 48v to 12v at 60a 97.5 % boost mode symbol parameter conditions min typ max units v low supply range 10 13 v v high output voltage 47 48 49 v output current 15 a f sw operating frequency 110 khz efficiency 12v to 48v at 15a 97 % dc2348aabf demo manual dc2348a-a/dc2348a-b
2 quick s tart p roce d ure p erformance summary demonstration circuit dc2348 a has voltage regulation (cv) and current regulation (cc) modes that can be evaluated. 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 vhigh or vlow and gnd terminals or directly across relevant capacitor. see figure 2 for proper scope probe technique. for cv (constant voltage) buck mode (v high is the input and v low is the output): 1. place jumpers in the following positions: jp1 ilim open jp2 pha se1 open jp3 mode fcm jp4 run off jp6 pha se2 gnd s1 buck/boost buck 2. with the power off, connect the input power supply to vhigh and gnd. connect the load to vlow and gnd. the load current should be less than 60a for dc2348a-a and less than 30a for dc2348a-b. 3. connect the setcur turret according to the buck/ boost setting: buck : setcur = v5 (jp1 pin 2) boost : setcur = gnd 4. turn on the power at the input. note: make sure that the input voltage is between 30v and 75v. 5. change the jp4 to on position. 6. check for the proper output voltage (v low = 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. 7. once the proper output voltage is established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. dc2348-b (2-phase) buck mode symbol parameter conditions min typ max units v high supply range 30 75 v v low output voltage 11.8 12 12.2 v output current 30 a f sw operating frequency 110 khz efficiency 48v to 12v at 30a 97 % boost mode symbol parameter conditions min typ max units v low supply range 10 13 v v high output voltage 47 48 49 v output current 7.5 a f sw operating frequency 110 khz efficiency 12v to 48v at 7.5a 97 % dc2348aabf demo manual dc2348a-a/dc2348a-b
3 quick s tart p roce d ure 8. disconnect the load from the dc2348 a and then turn off the input power. for cv boost mode (v low is the input and v high is the output). 9. change the s1 position from buck to boost . 10. connect the input power supply to vlow and gnd. connect the load to vhigh and gnd. the load cur - rent should be less than 15a for dc2348a-a and less than 7.5a for dc2348a-b. 11. turn on the input power . note: make sure that the input voltage is between 10v and 13v. check for the proper output voltage (v high = 47v to 49v). 12. once the proper output voltage is established, adjust the load within the operating range and obser ve the output voltage regulation, ripple voltage, efficiency and other parameters. for cc (constant current) mode operation: 1. use the same afore mentioned jumpers setting. 2. an electronic load active in cv (constant voltage) mode is required as the current-sinking device. set the electronic load voltage to below 11v or below 46v for buck or boost mode respectively. figure 1. proper measurement equipment setup (buck mode) dc2348aabf demo manual dc2348a-a/dc2348a-b
4 quick s tart p roce d ure 3. with the power off, connect the input power supply and the load according to the buck/boost setting: power supply electronic load buck vhigh vlow boost vlow vhigh 4. connect a dc voltage source between the setcur and gnd turrets. set the initial dc voltage to 1.25v. the valid setcur voltage range is 1.25v to 2v for buck mode and 1.25v to 0.5v for boost mode. turn on the power and then change the jp4 to on position. note: watch closely for the load current, which is pro - portional to the setcur voltage. at setcur = 1.25v the load current may or may not be zero, depending upon the different ilim settings. 5 . observe the imo n1 or imon2 turret voltage. it should be equal to the setcur voltage until the ilim-set current limit is hit. 6. adjust the setcur back to 1.25v . change the jp4 to off position. turn off the input power. for battery charging applications, setcur can be programmed dynamically on-the-fly to set the charging currents to the batteries in either buck or boost mode. the buck/boost mode can also be set dynamically : toggle the s1 switch to the middle position and drive the buck turret by a signal generator. buck : 5v boost : 0v note (constant current mode only): when doing the bidirectional current transition tests, both vhigh and vlow sides need a power supply and an electronic load which is active in the cv mode. in this case, the electronic load functions like a battery which is being charged. make sure the power supply voltages are always below the same side electronic load voltages. see figure 3 for proper equipment setup. figure 2. measuring input or output ripple across terminals or directly across bulk capacitor figure 3. proper equipment setup for bidirectional current transition tests (dc2348a in cc mode) + ? v out gnd c out dc2348 f03 setcur gnd v low supply v low dc2348a (?a or ?b) 0.5v ~ 2v dc voltage ? + + + v high supply v high electronic load (cv) enabled electronic load (cv) enabled dc2348aabf demo manual dc2348a-a/dc2348a-b
5 optiona l in d uctor d cr current sensin g demonstration circuit 2348a 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 table 2. optional inductor dcr current sensing configuration channel1 rs1 r39 r26 c32 channel2 rs2 r40 r25 c33 channel3 rs3 r43 r79 c34 channel4 rs4 r49 r54 c35 current sense resistor (default) ref sch ref sch open open inductor dcr current sensing 0 copper open calculated value from data sheet 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. figure 4. dc2348a-b buck mode typical efficiency vs load current figure 5. dc2348a-a buck mode typical efficiency vs load current i out (a) 0 efficiency (%) 99 97 91 89 87 83 81 79 93 95 85 77 75 15 10 25 dc2348a f04 30 5 20 v in = 36v v in = 75v v in = 48v i out (a) 0 efficiency (%) 99 97 91 89 87 83 81 79 93 95 85 77 75 30 20 50 dc2348a f05 60 10 40 v in = 36v v in = 75v v in = 48v dc2348aabf demo manual dc2348a-a/dc2348a-b
6 figure 6. dc2348a-b thermal image, v high = 75v, v low = 12v, i out = 30a, free air, t a = 25c figure 7. dc2348a-a thermal image, v high = 75v, v low = 12v, i out = 60a, free air, t a = 25c figure 8. mode transition from buck to boost optiona l in d uctor d cr current sensin g dc2348aabf demo manual dc2348a-a/dc2348a-b
7 p arts list d c 2348 a - a item qty reference part description manufacturer/part number required circuit components 1 10 c1, c14, c15, c16, c19, c53, c54, c55, c61, c75 cap, 1210 2.2f 10% 100v x7r avx 12101c225kat2a 2 2 c2, c60 cap, 100f 20% 100v elec sun elect. 100ce100kxt 3 4 c3, c4, c70, c100 cap, 33f 20% 80v elec panasonic eee-fk1k330p 4 1 c5 cap, 0603 47pf 10% 50v c0g avx 06035a470kat2a 5 2 c6, c9 cap, 0603 10nf 10% 100v x7r avx 06031c103kat2a 6 2 c7, c39, c58 cap, 0603 100nf 10% 50v x7r avx 06035c104kat2a 7 8 c8, c13, c28, c29, c45, c46, c48, c63 cap, 0603 0.22f 10% 25v x5r avx 06033d224kat2a 8 5 c10, c31, c51, c64, c107 cap, 0805 4.7f 10% 16v x7r avx 0805yc475kat2a 9 3 c11, c62, c65 cap, 0603 100pf 10% 100v npo avx 06031a101kat2a 10 2 c12, c67 cap, 0603 10pf 10% 100v c0g avx 06031a100kat2a 11 6 c18, c23, c59, c71, c105, c106 cap, 0603 1f 10% 25v x7r murata grm188r71e105ka12d 12 4 c21, c24, c47, c74 cap, 100f 20% 25v alum panasonic eehza1e101xp 13 4 c22, c25, c66, c72 cap, 1206 10f 10% 25v x7r murata grm31cr71e106ka12l 14 4 d1, d2, d3, d4 diode, schottky, rectifier diodes inc. dfls1100-7 15 4 l1, l2, l3, l4 ind, 10h wurth 7443641000 16 8 q1, q2, q3, q4, q17, q20, q22, q24 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc117n08ns5 17 8 q5, q6, q7, q8, q18, q19, q21, q23 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc040n08ns5 18 2 q33, q34 xstr, sipmos, p-channel vishay sud50p08-25l 19 4 rs1, rs2, rs3, rs4 res, 2010 0.001 1% 1w vishay wsl20101l000fea18 20 1 r1 res, 0603 649k 1% 1/10w vishay crcw0603649kfkea 21 1 r2 res, 0603 243k 1% 1/10w vishay crcw0603243kfkea 22 1 r3 res, 0603 200k 1% 0.1w vishay crcw0603200kfkea 23 23 r4, r12, r14, r21, r24, r30, r33, r34, r35, r39, r40, r43, r49, r67, r72, r80, r82 , r85, r86, r87, r88, r89 , r90 res, 0603 0 jumper visha y crcw06030000z0ea 24 1 r5 res, 0603 69.8k 1% 0.1w vishay crcw060369k8fkea 25 1 r6 res, 0603 12.7k 1% 1/10w vishay crcw060312k7fkea 26 8 r7, r8, r9, r17, r27, r36, r46, r48 res, 0603 10k 1% 1/10w vishay crcw060310k0fkea 27 1 r10 res, 0603 3.01k 1% 1/10w vishay crcw06033k01fkea 28 1 r11 res, 0603 4.53k 1% 1/10w vishay crcw06034k53fkea 29 2 r13, r47 res, 0603 20k 1% 1/10w vishay crcw060320k0fkea 30 1 r15 res, 0603 110k 1% 1/10w vishay crcw0603110kfkea 31 1 r16 res, 0805 499k 1% 1/8w vishay crcw0805499kfkea 32 1 r18 res, 0603 100k 5% 1/10w vishay crcw0603100kjnea 33 1 r22 res, 0603 90.9k 1% 1/10w vishay crcw060390k9fkea 34 2 r23, r81 res, 0603 10 1% 1/10w vishay crcw060310r0fkea 35 2 r29, r78 res, 1206 2.2 1% 1/4w vishay crcw12062r20fkea 36 4 r31, r32, r53, r65 res, 0603 4.99k 1% 0.1w vishay crcw06034k99fkea 37 4 r38, r41, r42, r50 res, 0603 300 1% 0.1w vishay crcw0603300rfkea 38 2 r44, r51 res, 0603 34k 1% 0.1w vishay crcw060334k0fkea dc2348aabf demo manual dc2348a-a/dc2348a-b
8 p arts list d c 2348 a - a item qty reference part description manufacturer/part number 39 2 r83, r84 res, 2512 0 jumper vishay crcw25120000z0eg 40 2 u1, u2 ic, high power bidirectional supply linear tech LTC3871hlxe#pbf additional demo board circuit components 1 0 c20, c27, c73, c76 cap, alum option option 2 0 c30, c32, c33, c34, c35, c92, c93, c98, c99, c101, c102, c103, c104 cap, 0603 option option 3 0 c88, c89, c90, c91, c94, c95, c96, c97, c108, c109, c110, c111, c112, c113, c114, c115 cap, 0805 option option 4 0 l1, l2, l3, l4 - alternate ind, 10h coilcraft ser2918h-103 5 0 q9, q10, q11, q12, q13, q14, q15, q16, q25, q26, q27, q28, q29, q30, q31, q32 xstr, mosfet option infineon ipd60n10s4-12 option 6 0 r19, r20 res, 0603 option option 7 0 r25, r26, r54, r79 res, 1206 option option hardware: for demo board only 1 16 e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15, e17 turret miil-max 2501-2-00-80-00-00-07-0 2 3 jp1, jp2, jp6 header, 4pin, dbl row 2mm wurth elektronik 62000821121 3 1 jp3 header, 4pin, 2mm wurth elektronik 62000411121 4 1 jp4 header, 2mm, 3pin wurth elektronik 62000311121 6 8 j1, j2, j3, j4, j5, j8, j9, j13 stud, testpin pem kfh-032-10 7 8 lug ring, #10 keystone 8205 8 16 nut, brass 10-32 any #10-32 9 4 mh1, mh2, mh3, mh4 standoff, snap on keystone 8834 10 8 washer, #10 tin plated brass any #10 ext bz tn 11 1 s1 switch, subminature, slide, spdt c&k-components js202011cqn 12 5 xjp1, xjp3, xjp4, xjp6, xjp7 shunt, 2mm wurth elektronik 60800213421 dc2348aabf demo manual dc2348a-a/dc2348a-b
9 p arts list d c 2348 a -b item qty reference part description manufacturer/part number required circuit components 1 5 c1, c14, c15, c16, c19 cap, 1210 2.2f 10% 100v x7r avx 12101c225kat2a 2 1 c2 cap, 100f 20% 100v elec sun elect. 100ce100kxt 3 2 c3, c4 cap, 33f 20% 80v elec panasonic eee-fk1k330p 4 1 c5 cap, 0603 47pf 10% 50v c0g avx 06035a470kat2a 5 2 c6, c9 cap, 0603 10nf 10% 100v x7r avx 06031c103kat2a 6 2 c7, c39 cap, 0603 100nf 10% 50v x7r avx 06035c104kat2a 7 4 c8, c13, c28, c29 cap, 0603 0.22f 10% 25v x5r avx 06033d224kat2a 8 2 c10, c31 cap, 0805 4.7f 10% 16v x7r avx 0805yc475kat2a 9 1 c11 cap, 0603 100pf 10% 100v npo avx 06031a101kat2a 10 1 c12 cap, 0603 10pf 10% 100v c0g avx 06031a100kat2a 11 3 c18, c23, c105 cap, 0603 1f 10% 25v x7r murata grm188r71e105ka12d 12 2 c21, c24 cap, 100f 20% 25v alum panasonic eehza1e101xp 13 2 c22, c25 cap, 1206 10f 10% 25v x7r murata grm31cr71e106ka12l 14 2 d1, d2 diode, schottky, rectifier diodes inc. dfls1100-7 15 2 l1, l2 ind, 10h wurth 7443641000 16 4 q1, q2, q3, q4 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc117n08ns5 17 4 q5, q6, q7, q8 xstr, mosfet n-ch 80v 100a tdson-8 infineon bsc040n08ns5 18 2 q33, q34 xstr, sipmos, p-channel vishay sud50p08-25l 19 2 rs1, rs2 res, 2010 0.001 1% 1w vishay wsl20101l000fea18 20 1 r1 res, 0603 649k 1% 1/10w vishay crcw0603649kfkea 21 1 r2 res, 0603 243k 1% 1/10w vishay crcw0603243kfkea 22 1 r3 res, 0603 200k 1% 0.1w vishay crcw0603200kfkea 23 11 r4, r12, r14, r21, r24, r30, r33, r34, r35, r39, r40 res, 0603 0 jumper vishay crcw06030000z0ea 24 1 r5 res, 0603 69.8k 1% 0.1w vishay crcw060369k8fkea 25 1 r6 res, 0603 12.7k 1% 1/10w vishay crcw060312k7fkea 26 6 r7, r8, r9, r17, r27, r36 res, 0603 10k 1% 1/10w vishay crcw060310k0fkea 27 1 r10 res, 0603 3.01k 1% 1/10w vishay crcw06033k01fkea 28 1 r11 res, 0603 4.53k 1% 1/10w vishay crcw06034k53fkea 29 1 r13 res, 0603 20k 1% 1/10w vishay crcw060320k0fkea 30 1 r15 res, 0603 110k 1% 1/10w vishay crcw0603110kfkea 31 1 r16 res, 0805 499k 1% 1/8w vishay crcw0805499kfkea 32 1 r18 res, 0603 100k 5% 1/10w visha y crcw0603100kjnea 33 1 r22 res, 0603 90.9k 1% 1/10w vishay crcw060390k9fkea 34 1 r23 res, 0603 10 1% 1/10w vishay crcw060310r0fkea 35 1 r29 res. 1206 2.2 1% 1/4w vishay crcw12062r20fkea 36 2 r31, r32 res, 0603 4.99k 1% 0.1w vishay crcw06034k99fkea 37 1 r44 res, 0603 34k 1% 0.1w vishay crcw060334k0fkea 38 2 r38, r41 res, 0603 300 1% 0.1w vishay crcw0603300rfkea 39 2 r83, r84 res, 2512 0 jumper vishay crcw25120000z0eg 40 1 u1 ic, high power bidirectional supply linear tech LTC3871hlxe#pbf dc2348aabf demo manual dc2348a-a/dc2348a-b
10 p arts list d c 2348 a -b item qty reference part description manufacturer/part number additional demo board circuit components 1 0 c20, c27 cap, alum option option 2 0 c30, c32, c33, c92, c93, c101, c102 cap, 0603 option option 3 0 c88, c89, c90, c91, c108, c109, c110, c111 cap, 0805 option option 4 0 l1, l2 - alternate ind, 10h coilcraft ser2918h-103 5 0 q9, q10, q11, q12, q13, q14, q15, q16 xstr, mosfet option infineon ipd60n10s4-12 option 6 0 r19, r20 res, 0603 option option 7 0 r25, r26 res, 1206 option option 8 1 s1 switch, subminature, slide, spdt c&k-components js202011cqn 9 4 xjp1, xjp4, xjp6, xjp7 shunt, 2mm wurth elektronik 60800213421 hardware: for demo board only 1 13 e1, e2, e3, e4, e5, e8, e9, e10, e11, e12, e13, e14, e15 turret miil-max 2501-2-00-80-00-00-07-0 2 2 jp1, jp2 header, 4pin, dbl row 2mm wurth elektronik 62000821121 3 1 jp3 header, 4pin, 2mm wurth elektronik 62000411121 4 1 jp4 header, 2mm, 3pin wurth elektronik 62000311121 5 5 j1, j2, j3, j4, j5 stud, testpin pem kfh-032-10 6 5 lug ring, #10 keystone 8205 7 10 nut, brass 10-32 any #10-32 8 5 washer, #10 tin plated brass any #10 ext bz tn 9 4 mh1, mh2, mh3, mh4 standoff, snap on keystone 8834 dc2348aabf demo manual dc2348a-a/dc2348a-b
11 s chematic dia g ram a a b b c c d d e e 4 4 3 3 2 2 1 1 7443641000 7443641000 pcb no. phmd clkin clkout ch2 gnd 1/4 v5 3/4 v5 float v5 0 0 0 0 90 60 60 90 45 240 180 180 180 180 120 vin vin vout vout vinp vin vout v5 vout v5 v5 v5 vinp vin v5 v5 v5 vinp vin vinp vin v5 vin run2 run1 drvset clkout ss2 setcur buck ithin2 itho2 mode fbo2 ovin uvin ovout fault_ ilim bg1 sw1 tg1 bg2 tg2 sw2 fbin extvcc vo imon1 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 3 tuesday, june 28, 2016 13 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 13 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 13 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger r7 10k 1% jp4 on off run 1 3 2 r29 2.2 1% 1206 q8 bsc040n08ns5 3 1 2 4 5 r11 4.53k 1% r8 10k 1% r41 300 1% r3 200k 1% + c3 33uf 80v q6 bsc040n08ns5 3 1 2 4 5 e8 run r1 649k 1% c33 opt r44 34k 1% r30 0 e15 gnd r39 0 r9 10k 1% j1 vhigh 30v up to 75v + c21 100uf r84 0 2512 r15 110k 1% j3 vlow q33 sud50p08-25l 2 3 1 q5 bsc040n08ns5 3 1 2 4 5 rs2 1m c32 opt r24 0 e4 buck/boost r32 4.99k 1% c6 10nf r13 20k 1% c16 2.2uf 100v c14 2.2uf r35 0 r25 opt 1206 c39 100nf c18 1uf q34 sud50p08-25l 2 3 1 r17 10k 1% d2 dfls1100 c11 100pf e12 gnd c7 100nf r40 0 r38 300 1% d1 dfls1100 u1 LTC3871hlxe ss 1 ithhigh 4 vfbhigh 5 v5 6 ovhigh 8 uvhigh 9 sgnd 7 ithlow 3 vfblow 2 imon 11 ovlow 10 snsd2+ 15 setcur 12 snsa1+ 48 run 18 fault_ 19 buck 16 ilim 17 snsd1+ 46 sns1- 47 sns2- 14 snsa2+ 13 drvset 20 nc 21 tg2 22 sw2 23 bst2 24 bg2 25 pgnd2 26 extvcc 27 sgnd 28 drvcc 29 nc 30 vhigh 31 nc 32 pgate 33 nc 34 pgnd1 35 bg1 36 bst1 37 sw1 38 tg1 39 nc 40 clkout 41 sync 42 freq 43 mode 44 phsmd 45 c1 2.2uf 100v 1210 e5 setcur r34 0 r23 10 1% r22 90.9k 1% r14 0 l1 10uh q3 bsc117n08ns5 3 1 2 4 5 r26 opt 1206 r2 243k 1% c12 10pf c13 0.22uf e10 clkout1 c19 2.2uf 100v j4 vlow j2 gnd + c24 100uf r83 0 2512 e9 fault r20 opt + c20 opt s1 buck boost 1 2 3 4 5 6 e2 imon1 r36 10k 1% jp1 ilim ilim 1 2 3 4 5 6 7 8 jp3 fcm buck p.s. mode p.s. 1 3 2 4 c22 10uf q4 bsc117n08ns5 3 1 2 4 5 r18 100k e1 extvcc + c2 100uf 100v l2 10uh c31 4.7uf 16v 0805 c105 1uf r12 0 + c27 opt r31 4.99k 1% + c4 33uf 80v e3 sync e11 vhigh r33 0 q2 bsc117n08ns5 3 1 2 4 5 q1 bsc117n08ns5 3 1 2 4 5 c8 0.22uf q7 bsc040n08ns5 3 1 2 4 5 c28 0.22uf r27 10k 1% r5 69.8k 1% c25 10uf c5 47pf e13 vlow r10 3.01k 1% j5 gnd e14 vin jp2 phase1 1 2 3 4 5 6 7 8 c29 0.22uf c9 10nf c30 opt c15 2.2uf c10 4.7uf 0805 rs1 1m c23 1uf r21 0 r19 opt bg2 sw1 sac1 vout sdc1 sw2 tg2 drvcc drvcc drvcc sac2 sac2 sdc2 sdc2 fbout fbout fbin vout ilim ss phmd1 itho ithin ilim mode ovout imon1 setcur buck run1 fault_ ovin uvin sw1 tg1 pgate extvcc bg1 sdc1 sac1 dc2348aabf demo manual dc2348a-a/dc2348a-b
12 s chematic dia g ram a a b b c c d d e e 4 4 3 3 2 2 1 1 7443641000 7443641000 pcb no. vin vin vout vout v5_2 vin v5_2 v5_2 fbin2 ithin2 itho2 fbo2 ss2 mode clkout ovin uvin ovout setcur buck ilim run2 fault_ drvset tg201 sw201 bg201 bg202 sw202 tg202 extvcc vo imon1 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 3 tuesday, june 28, 2016 23 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 23 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 23 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger rs3 1m r53 4.99k 1% r47 20k 1% d4 dfls1100 c71 1uf r88 0 c54 2.2uf 100v c65 100pf l310uh q18 bsc040n08ns5 3 1 2 4 5 j9 vlow c58 100nf d3 dfls1100 q23 bsc040n08ns5 3 1 2 4 5 c48 0.22uf c64 4.7uf 0805 r72 0 c61 2.2uf r78 2.2 1% e7 clkout2 r90 0 r51 34k 1% c106 1uf c63 0.22uf r50 300 1% q20 bsc117n08ns5 3 1 2 4 5 e17 gnd j8 vlow 12v / r87 0 c45 0.22uf c46 0.22uf c62 100pf r67 0 c67 10pf r65 4.99k 1% jp6 phase2 1 2 3 4 5 6 7 8 j13 gnd u2 LTC3871hlxe ss 1 ithhigh 4 vfbhigh 5 v5 6 ovhigh 8 uvhigh 9 sgnd 7 ithlow 3 vfblow 2 imon 11 ovlow 10 snsd2+ 15 setcur 12 snsa1+ 48 run 18 fault_ 19 buck 16 ilim 17 snsd1+ 46 sns1- 47 sns2- 14 snsa2+ 13 drvset 20 nc 21 tg2 22 sw2 23 bst2 24 bg2 25 pgnd2 26 extvcc 27 sgnd 28 drvcc 29 nc 30 vhigh 31 nc 32 pgate 33 nc 34 pgnd1 35 bg1 36 bst1 37 sw1 38 tg1 39 nc 40 clkout 41 sync 42 freq 43 mode 44 phsmd 45 r46 10k 1% r86 0 r54 opt 1206 c72 10uf c75 2.2uf q22 bsc117n08ns5 3 1 2 4 5 c66 10uf r81 10 1% c51 4.7uf 16v 0805 r49 0 r42 300 1% + c76 opt c55 2.2uf 100v q19 bsc040n08ns5 3 1 2 4 5 q21 bsc040n08ns5 3 1 2 4 5 r48 10k 1% r79 opt 1206 + c47 100uf c59 1uf r80 0 l4 10uh r85 0 r82 0 q17 bsc117n08ns5 3 1 2 4 5 c35 opt c107 4.7uf 0805 r89 0 c34 opt + c73 opt q24 bsc117n08ns5 3 1 2 4 5 + c74 100uf r43 0 e6 imon2 rs4 1m sw201 sw202 sac102 vout sdc102 sw202 tg202 drvcc2 drvcc2 sac202 sac202 vout sdc202 phmd2 bg201 bg202 sw201 tg201 extvcc imon2 sdc202 sac102 sdc102 drvcc2 dc2348aabf demo manual dc2348a-a/dc2348a-b
13 s chematic dia g ram a a b b c c d d e e 4 4 3 3 2 2 1 1 vin vin vin vin vinp tg1 bg1 sw1 tg2 bg2 sw2 tg201 bg201 sw201 tg202 sw202 bg202 fbin fbin2 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 3 tuesday, june 28, 2016 33 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 33 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger 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 3 tuesday, june 28, 2016 33 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-a bi-directional supply/charger q32 opt 2 3 1 q31 opt 2 3 1 c103 opt q14 opt 2 3 1 c97 opt 0805 c108 opt 0805 q30 opt 2 3 1 c93 opt r4 0 + c70 33uf 80v q12 opt 2 3 1 c110 opt 0805 c95 opt 0805 q25 opt 2 3 1 c94 opt 0805 c53 2.2uf 100v 1210 c91 opt 0805 q13 opt 2 3 1 c89 opt 0805 c112 opt 0805 r6 12.7k 1% c114 opt 0805 q11 opt 2 3 1 c88 opt 0805 c102 opt q29 opt 2 3 1 q16 opt 2 3 1 q27 opt 2 3 1 c99 opt r16 499k 1% 0805 c104 opt c109 opt 0805 c96 opt 0805 + c100 33uf 80v c92 opt + c60 100uf 100v c111 opt 0805 c98 opt c90 opt 0805 q28 opt 2 3 1 c113 opt 0805 c115 opt 0805 q9 opt 2 3 1 q15 opt 2 3 1 q10 opt 2 3 1 c101 opt q26 opt 2 3 1 fbin sw1 bg1 tg1 sw2 bg2 tg2 sw201 bg201 tg201 sw202 bg202 tg202 dc2348aabf demo manual dc2348a-a/dc2348a-b
14 s chematic dia g ram a a b b c c d d e e 4 4 3 3 2 2 1 1 7443641000 7443641000 pcb no. phmd clkin clkout ch2 gnd 1/4 v5 3/4 v5 float v5 0 0 0 0 90 60 60 90 45 240 180 180 180 180 120 vin vin vout vout vinp vin vout v5 vout v5 v5 v5 vinp vin v5 v5 v5 vinp vin vinp vin v5 vin run2 run1 drvset clkout ss2 setcur buck ithin2 itho2 mode fbo2 ovin uvin ovout fault_ ilim bg1 sw1 tg1 bg2 tg2 sw2 fbin extvcc vo imon1 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 3 tuesday, june 28, 2016 12 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger 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 3 tuesday, june 28, 2016 12 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger 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 3 tuesday, june 28, 2016 12 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger r7 10k 1% jp4 on off run 1 3 2 r29 2.2 1% 1206 q8 bsc040n08ns5 3 1 2 4 5 r11 4.53k 1% r8 10k 1% r41 300 1% r3 200k 1% + c3 33uf 80v q6 bsc040n08ns5 3 1 2 4 5 e8 run r1 649k 1% c33 opt r44 34k 1% r30 0 e15 gnd r39 0 r9 10k 1% j1 vhigh 30v up to 75v + c21 100uf r84 0 2512 r15 110k 1% j3 vlow q33 sud50p08-25l 2 3 1 q5 bsc040n08ns5 3 1 2 4 5 rs2 1m c32 opt r24 0 e4 buck/boost r32 4.99k 1% c6 10nf r13 20k 1% c16 2.2uf 100v c14 2.2uf r35 0 r25 opt 1206 c39 100nf c18 1uf q34 sud50p08-25l 2 3 1 r17 10k 1% d2 dfls1100 c11 100pf e12 gnd c7 100nf r40 0 r38 300 1% d1 dfls1100 u1 LTC3871hlxe ss 1 ithhigh 4 vfbhigh 5 v5 6 ovhigh 8 uvhigh 9 sgnd 7 ithlow 3 vfblow 2 imon 11 ovlow 10 snsd2+ 15 setcur 12 snsa1+ 48 run 18 fault_ 19 buck 16 ilim 17 snsd1+ 46 sns1- 47 sns2- 14 snsa2+ 13 drvset 20 nc 21 tg2 22 sw2 23 bst2 24 bg2 25 pgnd2 26 extvcc 27 sgnd 28 drvcc 29 nc 30 vhigh 31 nc 32 pgate 33 nc 34 pgnd1 35 bg1 36 bst1 37 sw1 38 tg1 39 nc 40 clkout 41 sync 42 freq 43 mode 44 phsmd 45 c1 2.2uf 100v 1210 e5 setcur r34 0 r23 10 1% r22 90.9k 1% r14 0 l1 10uh q3 bsc117n08ns5 3 1 2 4 5 r26 opt 1206 r2 243k 1% c12 10pf c13 0.22uf e10 clkout1 c19 2.2uf 100v j4 vlow j2 gnd + c24 100uf r83 0 2512 e9 fault r20 opt + c20 opt s1 buck boost 1 2 3 4 5 6 e2 imon1 r36 10k 1% jp1 ilim 1 2 3 4 5 6 7 8 jp3 fcm buck p.s. mode p.s. 1 3 2 4 c22 10uf q4 bsc117n08ns5 3 1 2 4 5 r18 100k e1 extvcc + c2 100uf 100v l2 10uh c31 4.7uf 16v 0805 c105 1uf r12 0 + c27 opt r31 4.99k 1% + c4 33uf 80v e3 sync e11 vhigh r33 0 q2 bsc117n08ns5 3 1 2 4 5 q1 bsc117n08ns5 3 1 2 4 5 c8 0.22uf q7 bsc040n08ns5 3 1 2 4 5 c28 0.22uf r27 10k 1% r5 69.8k 1% c25 10uf c5 47pf e13 vlow r10 3.01k 1% j5 gnd e14 vin jp2 phase1 1 2 3 4 5 6 7 8 c29 0.22uf c9 10nf c30 opt c15 2.2uf c10 4.7uf 0805 rs1 1m c23 1uf r21 0 r19 opt bg2 sw1 sac1 vout sdc1 sw2 tg2 drvcc drvcc drvcc sac2 sac2 sdc2 sdc2 fbout fbout fbin vout ilim ss phmd1 itho ithin ilim mode ovout imon1 setcur buck run1 fault_ ovin uvin sw1 tg1 pgate extvcc bg1 sdc1 sac1 dc2348aabf demo manual dc2348a-a/dc2348a-b
15 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 dia g ram a a b b c c d d e e 4 4 3 3 2 2 1 1 vin vin fbin2 tg1 bg1 sw1 tg2 bg2 sw2 fbin 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 3 tuesday, june 28, 2016 22 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger 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 3 tuesday, june 28, 2016 22 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger 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 3 tuesday, june 28, 2016 22 high power poly-phase n/a LTC3871hlxe#pbf demo circuit 2348a-b bi-directional supply/charger q14 opt 2 3 1 r6 12.7k 1% c108 opt 0805 c93 opt c110 opt 0805 c91 opt 0805 c89 opt 0805 r4 0 q13 opt 2 3 1 q9 opt 2 3 1 c88 opt 0805 q12 opt 2 3 1 c102 opt q16 opt 2 3 1 c109 opt 0805 c92 opt c111 opt 0805 q11 opt 2 3 1 c90 opt 0805 r16 499k 1% 0805 q10 opt 2 3 1 q15 opt 2 3 1 c101 opt fbin sw1 bg1 tg1 sw2 bg2 tg2 dc2348aabf demo manual dc2348a-a/dc2348a-b
16 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2016 lt 0816 ? 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 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 application engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2348aabf demo manual dc2348a-a/dc2348a-b

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