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1 description ltc 4120eud-4.2/ ltc 4120eud wireless power receiver and 400ma buck battery charger demonstration circuit dc1969 a is a kit of: the dc1967 a?a/b lt c ? 4120eud demonstration board, the dc1968a basic wireless transmitter, a 35 mm receiver ferrite disk, and an assortment of different length standoffs. the basic transmitter can deliver 2 w to the receive board with up to 10 mm spacing between the transmit and the receive l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. performance summary coils. the basic transmitter does not support foreign object detection, i.e. coins or other metallic objects. design files for this circuit board are available at http://www .linear.com/demo/dc1969a specifications are at t a = 25c symbol parameter conditions min typ max units hvin dc1968a high voltage input voltage range ihvin 500ma at hvin = 8v 8 38 v v cc dc1968a v cc input range iv cc = 0ma to 700ma 4.75 5.25 v v bat dc1967a bat pin voltage r9 = 1.40m, r10 = 1.05m 2.5 4.25 v i bat dc1967a bat pin current v bat = 3.7v, dc1967a(r5) = 3.01k 370 385 400 ma n 1x dc1967a ? a/b (ltc4120eud) demo board n 1 x dc1968a (wireless basic transmitter) demo board n 1x 35mm ferrite bead n 4x 6.25mm (0.25") nylon standoffs n 4x 12.5mm (0.50") nylon standoffs n 4x 15.875mm (0.625") nylon standoffs contents kit build options kit number tx board rx board dc1969a ? a dc1968a dc1967a ? a dc1969a ? b dc1968a dc1967a ? b receiver board build options rx board part number function dc1967a ? a ltc4120eud ? 4.2 fixed 4.2v float voltage dc1967a ? b ltc4120eud adjustable float voltage figure 1. dc1968a basic transmitter board figure 2. dc1967a-b ltc4120 receiver board dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
2 demo board procedure refer to figure 7 for the proper measurement equipment setup and jumper settings and follow the procedure be ? low. please test dc1968a first, by itself. 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 cc or v in and gnd terminals. see figure 8 for proper scope probe technique. 1. set ps1 = 36 v, observe v cc ( vm1) and i hvin am1. the dc1968a can be powered by 5 v on the v cc pin or up to 38 v on the hvin pins. the hvin pins are connected to an lt3480 buck regulator that makes 5 v at the v cc pins. standby power in the dc1968a basic transmitter varies between 0.5 w and 0.6 w, for a v cc current at 5v of 100ma ~ 130 ma. if the dc1968a is powered via the hvin pins then this current is scaled by the ratio 5v/ [v hvin 0.92], where 0.92 is efficiency of the regula? tor. so the standby hvin current is approximately 5.5/ [v hvin (100ma ~ 130ma)]. 2. remove ps1, vm1 and am1. attach ps2 and am2. 3. set ps2 to 5 v, and observe am2. the transmitter is being powered directly with no intervening buck regula ? tor, so the standby current should be between 100ma ~ 130ma. 4. connect a bipolar 1 supply ( ps3) to the dc1967a demo board bat pin. set the supply to 3.7 v and turn on. observe am3. 5. place the dc1967a board atop the dc1968a board, by aligning: dc1967a mounting hole dc1968a mounting hole mh1 => mh1 mh2 => mh2 mh3 => mh3 mh4 => mh4 this should result in the transmit antenna being directly above the receive antenna, with the centers aligned. observe am2 and am3. all the charge leds on the dc1967a should now be lit. am2 should have increased from 100ma ~ 130 ma to about 600 ma. am3 should be reading 380ma ~ 400 ma of charge current into the battery emulator. figure 6 shows the approximate full power (400 ma of charge current into 4.15v 1.7w ) and half power contours. the dc1969 a kit demonstrates operation of a double tuned magnetically coupled resonant power transfer circuit. dc1968a C basic transmitter the dc1968a basic transmitter is used to transmit wire ? less power and is used in conjunction with the dc1967a wireless power receiver board featuring the ltc4120. the dc1968a is configured as a current fed astable multi? vibrator, with oscillation frequency set by a resonant tank. 1 a bipolar supply can both sink and source current to maintain the correct output voltage. a unipolar supply can be converted into a suitable bipolar supply by putting a 3.6, 10w, resistor across the output. theory of operation the dc1968a basic transmitter is set to 130 khz operation and the dc1967 a ltc4120 demonstration board resonant frequency is 127 khz with dhc enabled and 140 khz with dhc disabled. for the dc1968a basic transmitter the resonant components are the 2x 0.15 f ppe film capaci ? tors ( cx1 and cx2) and the 5.0h ( lx) transmit coil. this gives a resonant frequency of 129.95 khz. the tolerance on the transmit coil and resonant capacitors is 2%, or 2.6khz. inductors l1 and l2 are used to make the resonant structure current fed. dc1969aabfb demo manual dc1969a-a/dc1969a-b
3 theory of operation the current fed topology makes the peak ? to ? peak voltage on the resonant tank equal to 2 v cc . v cc is 5 v, so the peak ? to ? peak tank voltage is 31.5v, see figure 3. the blue and green traces are the drains of the transmitter mosfets m1 and m 2 ( see figure 12), respectively. the red trace is the difference (v cx C v cy ) of those two nodes, and shows that the resonant tank is producing a sine wave. the peak ? to ? peak voltage of 2v cc = 31.5 v, results from the current fed topology. this in turn determines the breakdown of the mosfets and diodes d2 and d3. to increase transmit power by raising v cc , you must also change m1, m2, d2 and d3, to reflect the higher voltages on the c x and c y nodes. the magnitude of the magnetic field is directly proportional to the current in the transmit coil. for a resonant system this current is q times the input current. so the higher the q the larger the magnetic field. therefore the transmit coil is constructed with litz wire, and the resonant capacitors are very low dissipation pps film capacitors. this leads to a q of approximately 10 at 130khz , and a circulating current of approximately 6a p ? p , at full load. dc1967a C wireless power receiver board featuring the ltc4120 the ltc4120 wireless power receiver ic implements dynamic harmonization control ( dhc), which tunes or detunes the receive circuit to receive more or less power as needed . the primary receive tank is composed of lr, and c2s, although it must be noted that c2s is ac grounded through c5, the ltc4120 decoupling capacitor, to be in parallel with lr. c2s also serves to tap power off the resonant circuit and send it to the ltc4120, see figure 4. figure 4. dc1967a receiver figure 3. dc1968a basic transmitter 2s/div v cx-cy 20v/div v cx 10v/div v cy 10v/div dc1969a f03 2s/div i bat v bat = 3.7v 100a/div dc1969a f04 cx to gnd 20v/div the waveforms in figure 4 were captured at a transmit to receive gap of 8 mm. the blue trace is the waveform at the c x pin of the receiver board (figure 10), and the red trace is the charge current into the battery. although the transmit waveform is a sine wave, the series ? parallel con ? nection of the secondary resonant circuit does not yield a sine wave, and this waveform is correct. the charge current into the battery has an average of 400 ma, for a delivered power of 1.5w (v bat = 3.7 v). however, 20ma has been diverted to the charge leds, for a net battery charge current of 380 ma. the ripple on the charge current is synchronous to the transmit waveform. dhc when v in is above 14 v, the dhc pin is open and c2p doesnt enhance the energy transfer; this is the detuned state, and the resonant frequency of the receive tank is 142khz. when v in falls below 14v , the dhc pin is grounded putting c2p in parallel with both c2s and lr thus changing the resonant frequency to 127.4 khz. when the receiver is tuned at 127.4 khz and drawing significant power, the transmit frequency is pulled down to 127 khz. so , at full power the system is now a double ? tuned resonant circuit. figure 6 shows approximate power transfer vs distance between transmitter and receiver. note the minimum clearance. the minimum is needed to avoid exceeding the maximum input voltage. summary the ltc4120 wireless power receiver ic adjusts the receiver resonant frequency to keep the system from transferring too much power when the coupling is high between transmit dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
4 theory of operation 17mm full power 1mm ? power 1mm ? power envelope 18mm 13mm 15mm 2mm 3mm 4mm 5mm 6mm 7mm 8mm 9mm full power envelope dc1967a-b with 25mm receive antenna dc1969a f06 transmit antenna 1mm minimum clearance figure 6. power transfer vs axial distance and misalignment and receive coils. the ltc4120 wireless power receiver ic increases power transfer when power transfer is insuf? ficient. this is accomplished by switching capacitors into the resonant circuit using the dhc pin. this gives a much wider operating transmit distance, see figure 5. distance of 8 mm, to the battery. there is negligible transmit frequency ripple on v in , and the voltage is well above the 14v dhc voltage. this indicates that the input rectifiers are operating in peak detect mode, and that dhc is inactive. 35mm ferrite disk the dc1969a ? a/dc1969a ? b kit includes a 35 mm ferrite disk. the purpose of this disk is to increase the power received by the dc1967a ? a/dc1967a ? b receiver board. the 25 mm ferrite disk that is shipped and attached to the dc1967a ? a/dc1967a ? b board is attached with double ? sided tape, and is likely to break if removed. laying the 35mm ferrite on top of the shipped 25 mm ferrite disc will increase received power approximately 30%. removing the 25 mm ferrite disk and attaching the 35 mm disk will increase received power approximately 20%. in both cases the minimum clearance distance will increase to approximately 3 mm. since the 25 mm ferrite disk shipped on the dc1967a ? a/dc1967a ? b board is likely to break, exchanging disks can only be done once. figure 5. dc1967a receiver 2s/div v in to gnd 5v/div dc1969a f05 i bat v bat = 3.7v 100ma/div the blue trace is the charge current into the battery, and the red trace is the voltage at v in on the receiver board . v in is about 25 v, while the ltc4120 delivers 1.5 w at a dc1969aabfb demo manual dc1969a-a/dc1969a-b
5 theory of operation figure 7 note: all connections from equipment should be kelvin connected directly to the board pins which they are connected on this diagram and any input or output leads should be twisted pair. + ? am1 vm1 ps1 8v to 38v supply 1a + ? + ? + ? am2 ps2 5v supply 1a + ? + ? am3 ps3 3.7v bipolar supply 1a + ? figure 7a. using high voltage input figure 7b. using the v cc input figure 7c. receive board with battery emulator dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
6 gnd vin figure 8. measuring input or output ripple theory of operation figure 9. ltc4120 (dc1968a and dc1967a-b) radiated emissions frequency (mhz) gtem cell measurement corrected per iec 61000-4-20 to 10m detector = peak hold rbw = 120khz vbw = 300khz sweep time = 680ms # of points = 501 # of sweeps 10 10 dbv/m 30 60 dc1969a f09 20 0 40 50 10 ?10 ?20 100 1,000 cispr 11 class a limit cispr 11 class b limit 1968a only 1968a and 1967a-b 1968a and 1967a-b and batt radiated emissions radiated emissions information was gathered using a gigahertz transverse electromagnetic ( gtem) cell. the gtem cell dimensions were 0.2 m 0.2 m 0.15 m. the data was normalized to a 10 m semi ? anechoic chamber (sac) per iec61000 ? 4 ? 20 using peak hold detection. the limits shown on the graph are for cispr 11 class a (yellow) and class b ( red). the cispr 11 limits are ap ? plicable to industrial commercial and medical equipment. the emissions detection method was peak hold of the square root of the sum of the emissions from each face, x, y, z, squared. as the emissions are always at least 6db from the regulatory limits, the use of quasi ? peak detec ? tion was not necessary. data was gathered on a single representative system. the blue line shape is data gathered from a dc1968a basic transmitter operating alone and powered at v cc = 5 v from a bench supply. the yellow line shape is data gathered from a dc1968a basic transmitter powered at v cc = 5 v from a bench supply, and energizing a dc1967a ltc4120 wireless power receive board with no battery. and the green line shape is data gathered from a dc1968a basic transmitter powered at v cc = 5 v from a bench supply, and energizing a dc1967a ltc4120 wireless power receive board charging a li ? ion batter y at 400ma. the ltc4120 wireless power system is intended to be a part of a complete end product. only the complete end product needs to be fcc certified. the data presented here on the wireless power system is for end product design purposes only, not to obtain fcc certification. dc1969aabfb demo manual dc1969a-a/dc1969a-b
7 parts list item qty reference part description manufacturer/ part number dc1967a required circuit components 1 2 c2s1, c2p1 cap, chip, c0g, 0.0047f, 5%, 50v, 0805 murata, grm2165c1h472ja01d 2 1 c2p2 cap, chip, c0g, 0.0018f, 5%, 50v, 0603 kemet, c0603c182j5gac7533 3 1 c2s2 cap, chip, c0g, 0.022f,5%, 50v, 0805 murata, grm21b5c1h223ja01l 4 1 c1 cap, chip, x5r, 10f, 20%, 16v, 0805 tdk, c2012x5r1c106k 5 1 c2 cap, chip, x5r, 47f, 10%, 16v, 1210 murata, grm32er61c476ke15l 6 1 c3 cap, chip, x7r, 0.01f, 10%, 50v, 0603 tdk, c1608x7r1h103k 7 1 c4 cap, chip, x5r, 2.2f, 20%, 6.3v, 0402 murata, grm155r60j225me15d 8 1 c5 cap, chip, x7s, 10f, 20%, 50v, 1210 tdk, c3225x7s1h106m 9 3 d1, d2, d3 diode, schottky, 40v, 2a, powerdi123 diodes, dfls240l 10 1 d4 diode, zener, 39v, 5%, 1w, powerdi123 diodes, dflz39 11 1 fb1 25mm ferrite bead adams magnetics, b67410 ? a0223 ? x195 12 0 lr ind, embedded, 47h, 43 turns embedded 13 1 l1 ind, smt, 15h, 260m, 20%, 0.86a, 4mm 4mm lps4018 ? 153ml 14 1 r1 res, chip, 1.40m, 1%, 1/16w, 0402 vishay, crcw04021m40fked 15 1 r2 res, chip, 412k, 1%, 1/16w, 0402 vishay, crcw0402412kfked 16 2 r3, r7 res, chip, 10k, 1%, 1/16w, 0402 vishay, crcw040210k0fked 17 1 r5 res , chip, 3.01k, 1, 1/16w, 0402 visha y, crcw04023k01fked 18 2 r6, r8 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed additional demo board circuit components 1 2 c7, c10 cap, chip, x5r, 1f, 10%, 16v, 0402 tdk, c1005x5r1c105k 2 3 c6, c8, c9 cap, chip, x7r, 0.01f, 10%, 25v, 0402 tdk, c1005x7r1e103k 3 8 d5, d6, d7, d8, d9, d10, d11, d12 diode, led, green, 0603 lite ? on, l tst ? c193kgkt ? 5a 4 1 r4 res, chip, 2k, 5%, 1/16w, 0402 vishay, crcw04022k00jned 5 2 r11, r12 res, chip, 100k, 5%, 1/16w, 0402 vishay, crcw0402100kjned 6 1 r13 res, chip, 10k, 5%, 1/16w, 0402 vishay, crcw040210k0jned 7 2 r14, r35 res, chip, 432, 1%, 1/16w, 0402 vishay, crcw0402432rfked 8 2 r15, r33 res, chip, 22.6k, 1%, 1/16w, 0402 vishay, crcw040222k6fked 9 1 r16 res, chip, 34.8k, 1%, 1/16w, 0402 vishay, crcw040234k8fked 10 7 r17, r18, r19, r20, r21, r22, r23 res, chip, 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 11 1 r24 res, chip, 49.9k, 1%, 1/16w, 0402 vishay, crcw040249k9fked 12 8 r25, r26, r27, r28, r29, r30, r31, r32 res, chip, 1k, 5%, 1/16w, 0402 vishay, crcw04021k00jned 13 1 r34 res, chip, 787k, 1%, 1/16w, 0402 vishay, crcw0402787kfked 14 2 u2, u3 ultralow power quad comparators with reference, 5mm 4mm dfn ? 16 linear tech., ltc1445cdhd hardware for demo board only 1 6 e 1, e2, e5, e6, e9, e10 turret , 0.091" mill ? max, 2501 ? 2 ? 00 ? 80 ? 00 ? 00 ? 07 ? 0 2 4 e3, e4, e7, e8 turret, 0.061" mill ? max, 2308 ? 2 ? 00 ? 80 ? 00 ? 00 ? 07 ? 0 3 0 j1 ? o pt conn, 3 pin polarized hirose, df3 ? 3p ? 2dsa 4 4 jp1, jp3 ? jp5 header, 3 pin, smt, 2mm samtec, tmm ? 103 ? 01 ? l ? s ? sm 5 1 jp2 header, 4 pin, smt, 2mm samtec, tmm ? 104 ? 01 ? l ? s ? sm 6 5 jp1 ? jp5 shunt, 2mm samtec, 2sn ? bk ? g 7 4 clear 0.085" 0.335" bumper keystone, 784 ? c dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
8 parts list item qty reference part description manufacturer/ part number 8 15 15mm double sided tape 3m, 34 ? 8705 ? 5578 ? 5 9 4 stand ? off, nylon, 0.375" keystone, 8832 dc1967a-a required circuit components 1 0 r9 no load. smd 0402 2 1 r10 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 3 1 u1 400ma wireless synchronous buck battery charger, 3mm 3mm qfn ? 16 linear tech., ltc4120eud ? 4.2 dc1967a-b required circuit components 1 1 r9 res, chip, 1.40m, 1%, 1/16w, 0402 vishay, crcw04021m40fked 2 1 r10 res, chip, 1.05m, 1%, 1/16w, 0402 vishay, crcw04021m05fked 3 1 u1 400ma wireless synchronous buck battery charger, 3mm 3mm qfn ? 16 linear tech., ltc4120eud dc1968a required circuit components 1 1 cx1, cx2 cap, chip, pps, 0.15f, 2%, 50v, 6.0mm 4.1mm panasonic, echu1h154gx9 2 2 c4, c5 cap, chip, x7r, 0.01f, 10%, 50v, 0402 murata, grm155r71h103ka88d 3 1 c6 cap, chip, x5r, 4.7f, 10%, 50v, 1206 murata,grm31cr71h475ka12l 4 1 c7 cap, chip, x5r, 0.068f, 10%, 50v, 0603 murata, grm188r71h683k 5 1 c8 cap, chip, c0g, 330pf, 5%, 50v, 0402 tdk, c1005c0g1h331j 6 1 c9 cap, chip, x7r, 0.47f, 10%, 25v, 0603 murata,grm188r71e474k 7 1 c10 cap, chip, x5r, 22f, 20%, 6.3v, 0805 taiyo ? yuden,jmk212bj226mg 8 2 d1, d4 diode, zener, 16v, 350mw, sot23 diodes , bzx84c16 9 2 d2, d3 diode, schottky, 40v, 1a, 2dsn on semiconductor, nsr10f40nxt5g 10 1 d5 diode, schottky, 40v, 2a, powerdi123 diodes, dfls240l 11 2 l1, l2 ind, smt, 68h, 0.41a, 0.40, 20%, 5mm 5mm tdk, vlcf5028t ? 680mr40 ? 2 12 1 l3 ind, smt, 4.7h, 1.6a, 0.125, 20%, 4mm 4mm coilcraft, lps4018 ? 472m 13 1 lx transmit coil tdk, wt ? 505060 ? 8k2 ? lt 14 2 m1, m2 mosfet, smt, n ? channel, 60v, 11m, so8 vishay, si4108dy ? t1 ? ge3 15 1 m3 mosfet, smt, p ? channel, ? 12v, 32m, sot23 vishay, si2333ds 16 1 m4 mosfet, smt, n ? channel, 60v, 7.5, 115ma, sot23 on semi, 2n7002l 17 2 r1, r2 res, chip,100, 5%, 1/16w, 0402 vishay, crcw0402100rjned 18 2 r3, r8 res, chip, 150k, 5%, 1/16w, 0402 vishay, crcw0402150jned 19 1 r4 res, chip, 40.2k, 1%, 1/16w, 0402 vishay, crcw040240k2fked 20 1 r5 res, chip, 20k, 1%, 1/16w, 0402 vishay, crcw040220k0fked 21 2 r6, r10 res, chip, 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 22 1 r7 res, chip, 536k, 1%, 1/16w, 0402 vishay, crcw0402536kfked 23 1 u1 lt3480edd, pmic 38v, 2a, 2.4mhz step ? down switching regulator with 70a quiescent current linear tech., lt3480edd additional demo board circuit components 1 0 cx3 ? o pt , cx4 ? o pt cap, pps, 0.15f, 2.5%, 63 vac , mks02 wima, mks0d031500d00jssd 2 1 d6 led, green, 0603 lite ? on, l tst ? c190kgkt 3 1 r9 res , chip, 1k, 5%, 1/16w, 0402 visha y, crcw04021k00jned hardware for demo board only 1 6 e1 ? e6 turret, 0.09 dia mill ? max, 2501 ? 2 ? 00 ? 80 ? 00 ? 00 ? 07 ? 0 2 40 40mm double sided tape 3m, 34 ? 8705 ? 5578 ? 5 3 4 stand ? off, nylon, 0.375" keystone, 8832 dc1969aabfb demo manual dc1969a-a/dc1969a-b
9 schematic diagram figure 10. dc1967a circuit schematic 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v opt freq ext 1.5 mhz ntc int 400ma 2.7 v - 11v 750 khz disconnected connected embedded inductor 1210 r10 to be connected to " bat " node at bat turret (e6) -b assy * -a 1.40meg 0 ohm open r10 r9 1.05meg ltc4120 - 4.2eud ltc4120eud u1 off run vin > 11v on 2 demo circuit 1967a - a / b 1 2 400ma wireless synchro nous buck battery charger n/a ltc4120eud - 4.2 / ltc4120eud nc george b. 9 - 17 - 13 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 ci rcuit 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 george b. production fab 2 9 - 17- 13 - revision history description date approved eco rev vbar vprog intvcc intvcc d1 dfls240l e9 gnd c5 10f 50v e7 nchrg jp4 r6 0 c3 0.01f 0603 l1 15.0uh r4 2.0k 5% c2s1 4700pf 5% 50v 0805 e6 bat c1 10uf 16v 0805 r10 * u1 ltc4120eud-4.2 / ltc4120eud 16 13 1 5 12 17 9 3 6 10 7 2 4 8 15 14 11 run prog intvcc gnd ntc gnd bat in dhc batsns/fb freq boost sw chgsns fault chrg nc/fbg e10 5v - 40v vin e4 prog jp3 r9 * e2 gnd e8 nfault r5 3.01k r2 412k r11 100k 5% d2 dfls240l e3 ntc r1 1.40meg c2s2 0.022f 5% 50v 0805 e5 gnd r7 10k r12 100k 5% c2 47uf 16v 1210 d3 dfls240l c4 2.2f 6.3v e1 cx c2p2 1800pf 5% 50v 0603 r3 10k r8 0 jp2 c2p1 4700pf 5% 50v 0805 j1 df3-3p-2dsa 1 2 3 bat gnd entc embedded inductor 43t lr 47h jp1 39v d4 dflz39 dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
10 schematic diagram figure 11. dc1967a circuit schematic 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 1.221v u2.3 u3.3 disable monitor 1.186v enable 1.186v chg current 2 demo circuit 1967a-a/b 2 2 bar graph for 400ma wireless sy nchronous n/a ltc4120eud - 4.2 / ltc4120eud nc george b. buck battery charger 9 - 17 - 13 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 ci rcuit 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 vprog vbar d12 94% 1 2 r21 100k c8 0.01f r14 432 jp5 u2e ltc1445cdhd 8 9 refv- r25 1k 5% r32 1k 5% r16 34.8k d6 19% 1 2 r19 100k u3d ltc1445cdhd 13 12 14 9 15 3 17 r20 100k r26 1k 5% u2c ltc1445cdhd 11 10 14 9 16 3 17 c9 0.01f u3b ltc1445cdhd 7 6 14 9 1 3 17 r17 100k r24 49.9k c6 0.01f r23 100k u2d ltc1445cdhd 13 12 14 9 15 3 17 r18 100k r30 1k 5% r35 432 c7 1f 10v r33 22.6k r28 1k 5% u3e ltc1445cdhd 8 9 refv- d10 69% 1 2 r29 1k 5% c10 1f 10v r34 787k d8 44% 1 2 d11 81% 1 2 d9 56% 1 2 d5 6% 1 2 r13 10k 5% d7 31% 1 2 u3c ltc1445cdhd 11 10 14 9 16 3 17 r31 1k 5% r22 100k r27 1k 5% u2b ltc1445cdhd 7 6 14 9 1 3 17 r15 22.6k u2a ltc1445cdhd 5 4 14 9 2 3 17 u3a ltc1445cdhd 5 4 14 9 2 3 17 dc1969aabfb demo manual dc1969a-a/dc1969a-b
11 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 figure 12. dc1968a circuit schematic 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 8v - 38v 4.75v - 5.25v 5v out fc6041 fc6041 mks02 mks02 opt opt 5.0uh 5% lx 3 demo circuit 1968a 1 1 basic inductive transmitter with pre - regulator n/a nc george b. 9 - 17 - 13 ltc4120eud-4.2 / ltc4120eud 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 ci rcuit 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 george b. production fab 3 9 - 17 - 13 - revision history description date approved eco rev d5 dfls240l 40v 2a 1 2 m1 si4108dy-t1-ge3 4 1 7 8 5 6 2 3 u1 lt3480edd 1 2 3 4 5 7 6 8 9 10 11 bd boost sw vin run/ss pg sync fb vc rt gnd m4 2n7002l 3 1 2 c5 0.01uf d2 nsr10f40nxt5g e2 gnd c9 0.47uf 25v 0603 d3 nsr10f40nxt5g r10 100k r8 150k 5% c10 22uf 6.3v 0805 20% r1 100 5% r5 20k e3 vcc r2 100 5% c7 0.068uf 50v 0603 c6 4.7uf 1206 50v d6 on l2 68uh 16v d1 bzx84c16 e5 cy r4 40.2k r7 536k e4 gnd cx4 0.15uf 2.5% m3 si2333ds 1 2 3 l3 4.7uh l1 68uh e1 hvin r3 150k 5% e6 cx cx3 0.15uf 2.5% r6 100k m2 si4108dy-t1-ge3 4 1 7 8 5 6 2 3 16v d4 bzx84c16 cx1 0.15uf 2% c8 330pf 5% r9 1k 5% cx2 0.15uf 2% c4 0.01uf dc1969aabfb demo manual dc1969 a-a/ dc1969 a-b
12 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035 ? 74 17 (408) 432 ? 1900 fax : (408) 434 ? 05 07 www.linear.com ? linear technology corporation 2014 lt 0215 rev b ? printed in usa demonstration board important notice linear technology corporation ( lt c ) provides the enclosed product(s) under the following as is conditions: this demonstration board ( demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by lt c for commercial use. as such, the demo board herein may not be complete in terms of required design ? , marketing ? , and/or manufacturing ? related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither p arty shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases lt c from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the 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 whatsoever. lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a lt c applica? tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc1969aabfb demo manual dc1969a-a/dc1969a-b

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