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1 description lt c4013eufd 60v synchronous buck multi-chemistry battery charger demonstration circuit 2374a is a multi-chemistry battery charger with maximum power point tracking (mppt) featuring the lt c ? 4013. the ltc4013 has 2 stage cc/cv charge cycles, 3 stage and 4 stage lead acid and li-ion battery algorithms. the dc2374a is set up to operate from a 21.5v to 35v supply or from a solar panel and charges a six cell lead acid battery at 5a. there are optional input and output capacitors plus large inductor pads and parallel top and bottom fet pads to allow high power charging. the ltc4013 is a 60v controller which makes it suitable for large battery stacks with up to a 60v supply or solar panel input. an mppt burst mode feature allows the device to efficiently charge in low light levels. since the ltc4013 is a controller, the power train can be sized from 1a to 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 over 10a of charge current. the ltc4013 also has an ntc temperature compensated float voltage to help increase the battery life. the operating frequency, charge voltage, low battery (lb) voltage setting and timing are configurable with external resistors and a capacitor. the different charging algorithms are set by two tri-state mode pins and the timer pin as shown in table 1. refer to the ltc4013 data sheet for more details on the electrical and timing specifications. design files for this circuit board are available at http: //www.linear.com/demo/dc2374a specifications are at t a = 25c parameter conditions min typ max units input supply range enable (jp1) = uvlo enable (jp1) = on, mppt (jp2) = on 21.5 5 24 35 35 v v battery float voltage (v float ) mode1 (jp4) = hi, mode2 (jp3) = lo mode1 (jp4) = mid, mode2 (jp3) = lo mode1 (jp4) = hi, mode2 (jp3) = mid mode1 (jp4) = mid, mode2 (jp3) = mid 13.6 13.2 14.2 14.4 v v v v battery absorption voltage (v abs ) mode1 (jp4) = hi, mode2 (jp3) = lo mode1 (jp4) = mid, mode2 (jp3) = lo 14.2 14.4 v v battery equalization voltage (v eq ) mode1 (jp4) = hi, mode2 (jp3) = hi, timer (jp6) = cap mode1 (jp4) = mid, mode2 (jp3) = hi, timer (jp6) = cap 16 15.6 v v recharge voltage (v rechrg ) mode1 (jp4) = hi, mode2 (jp3) = mid mode1 (jp4) = mid, mode2 (jp3) = mid 13.77 13.77 v v low battery (v lb ) 10.4 v mppt maximum power voltage (v pm ) to open circuit voltage (v oc ) ratio mppt ( jp2) = on 83.3 % fboc to dcin attenuation ratio mppt ( jp2) = on 6.9 % dc2374afa demo manual dc2374a
2 board photo dc2374afa demo manual dc2374a
3 typical application 24v 5a 6 cell lead acid charger with absorption and equalization charging efficiency and power loss vs charge current dc2374afa demo manual dc2374a 3 665k r3 40.2k c3 0.1f c15 0.15f c9 68f c2/10 10f2 m1, m2, m3, m4 vishay sis434dn l1 wurth 7443340680 c1 4.7f 50v 4 c2, c10 10f, 50v c16-c18 22f 25v c23 220f 25v c9 panasonic 68f 50v eehza1h680p 4 stage charging with 13.6v float, 14.2v absorption and 15.0v equalization 3.3 hr timeout 5 87 88 89 90 91 92 93 v in = 24v 94 95 96 97 0 0.5 1.0 1.5 2.0 2.5 v bat = 13.8v efficiency (%) power loss (w) 4013 ta01a intv cc 24v intv cc intv cc bat dcin d1 efficiency b0540w dcin enab intv cc sync sgnd sense bat i th rt power loss clkout pgnd fb tg sw bst bg v in fboc mppt charge current (a) infet lb ntc mode1 mode2 vin _s stat1 stat0 tmr ismon 0 ltc4013 battery 4013 ta05 m1 m2 m3 m4 c1 4.7f c29 4.7nf r22 23.2k 1 r24 86.6k r23 86.6k c31 0.22f r sense 10m r fb2 499k r fb1 100k c16-18 22f3 2 c23 220f c19 0.1f c13 4.7f l1 6.8h r17 7.5k d3 green r18 7.5k d2 red r1
4 24v supply quick start procedure the dc2374 a is easy to set up to evaluate the performance of the ltc4013 . refer to figure 1 and figure 2 for proper measurement equipment setup. note: when measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. measure the input or output voltage ripple by touching the probe tip directly across the v in or v out and gnd terminals. see figure 2 for proper scope probe technique. 1. set the dc2374a to operate in a three stage lead acid battery charging mode by positioning the jumpers as listed below: jp1 enable - uvlo jp2 mppt - off jp3 mode2 C lo jp4 mode1 C hi jp5 ntc C int jp6 timer C cap jp7 pull_up pwr - dcin 2. with power off, connect a 0v to 16v , 6a power supply (ps2) to bat and gnd terminals with a series ammeter and a voltmeter as shown in figure 1. 3. with power off, connect a 5.1a load (load1) to bat and gnd terminals in parallel with ps2 as shown in figure 1. 4. set ps2 to 10v and turn on ps2 and load1. 5. with power off, connect a 0v to 35v , 5a power supply (ps1) to dcin and gnd terminals with a series am - meter and a voltmeter as shown in figure 1. charging options table 1. ltc4013 charging algorithm selection mode1 mode2 timer charging mode v float (v) v abs (v) v eq (v) recharge termination eq timeout l l 0v 2 stage 13.6 - - - none none l l cap 2 stage 13.6 - - - 3.33hrs none l m 0v 2 stage 14 - - - none none l m cap 2 stage 14 - - - 3.33hrs none l h 0v n/a, do not use - - - - - - l h cap 4 stage 13.6 14.2 15 - 3.33hrs 50min m l 0v 3 stage 13.2 14.4 - - c/10 (~14.1v) none m l cap 3 stage 13.2 14.4 - - 3.33hrs none m m 0v li-ion 14.4 - - 95.8% (13.77v) c/10 (~14.3v) none m m cap li-ion 14.4 - - 95.8% (13.77v) 3.33hrs none m h 0v n/a, do not use - - - - - - m h cap 4 stage 13.2 14.4 15.6 - 3.33hrs 25min h l 0v 3 stage 13.6 14.2 - - c/10 (~14.1v) none h l cap 3 stage 13.6 14.2 - - 3.33hrs none h m 0v li-ion 14.2 - - 97.1 (13.77v) c/10 (~14.1v) none h m cap li-ion 14.2 - - 97.1 (13.77v) 3.33hrs none h h 0v n/a, do not use - - - - - - h h cap 4 stage 13.6 14.2 15 - 3.33hrs 25min dc2374afa demo manual dc2374a
5 6. set ps1 to 20v and then turn on. 7. slowly increase ps1 until the stat 0 led illuminates. dcin is now above the uvlo rising threshold. note. p s1 can be increased from this voltage up to 35v. make sure that the input voltage does not exceed 40v. 8. observe that the battery charger current is only about 1a, 20%, and the voltage on the ismon terminal measures about 0.2vdc. this is because the battery voltage is below the lb threshold. if the battery voltage remains below low bat for 25 minutes then the charge cycle is terminated. 9. slowly increase ps2 until the battery current jumps up to about 5a, full load. ismon reads close to 1v. the battery voltage is now above the low battery threshold. 10. slowly increase ps2 until the battery current decreases to 4.5a. if the stat 0 led is on and the stat 1 led is off then the battery voltage is now approaching the absorption voltage and the charge timer has started. the battery will charge for about 3.3hrs before switch - ing to foat mode. 11. when the ltc4013 switches to foat mode, the charge current will drop to 0a until the battery voltage is decreased below 13.6v. to observe equalization mode, follow steps 12 thru 18. otherwise skip to step 19. note: equalization mode will not enable more than one time during a power on event. if an equalization cycle has already completed, power will need to be cycled in order to run a second equalization cycle. 24v supply quick start procedure 12. make sure ps1 is set above uvlo rising threshold and set ps2 to about 12v. 13. make sure jp6, the timer jumper, is still in the cap position. set jp3, the mode2 jumper, to the hi posi - tion. the stat 0 led should be on and the stat 1 led should be off. if not, power ps1 down, set jp3 to lo, turn ps1 back on, then set jp3 back to hi. 14. increase ps2 until the battery voltage approaches the absorption voltage as done in step 10. 15. continue increasing ps2 until the battery current drops below 500ma. 16. in about 3.33 hours the charge current will increase to about 1a. this is equalization mode. 17. increase ps2 until the battery current starts to decrease. the battery voltage is approaching the equalization voltage. 18. after about 25 minutes in equalization mode the charge current will return to about 0a until the battery voltage is reduced below the foat voltage of about 13.6v. 19. when done, turn off and disconnect all loads and power supplies. note: to evaluate the mppt function, see the mppt quick start procedure section. dc2374afa demo manual dc2374a
6 24v supply quick start procedure + ? + ? ps1 0v ? 35v 5a + ? + ? + ? + ? ps2 0v ? 16v 6a + ? load1 5.1a + ? dc2374a f01 figure 1. proper measurement equipment setup figure 2. measuring input or output ripple dc2374afa demo manual dc2374a
7 mppt quick start procedure the ltc4013 has a maximum power point tracking feature that regulates the input voltage to the maximum power voltage (v pm ) by adjusting the output of the charger. the ltc4013 mppt function periodically stops charg - ing, measures the open circuit voltage (v oc ), and then continues charging while regulating the input voltage. as the sunlight changes, the v oc and v pm also change. this board is setup to regulate a v pm voltage of 83% of the measured v oc . this ratio can be changed to match the solar panel by changing r2, r8, and r10 . to change the v oc /v pm ratio, follow the procedure listed in the maximum power point tracking section in the ltc4013 data sheet. there are a number of ways to test the mppt function of the ltc4013. the most accurate way is to use a solar panel in sunlight, however it is difficult to control the sunlight conditions. another method is to use a covered solar panel (dark panel) biased thru a controlled current source from 0a to the short circuit current (i sc ) of the panel as shown in figure 3. the solar panel can be replaced with a string of silicon rectifier diodes that can handle the power dis - sipation of v f ? i sc . with these methods, increasing the current on the panel to i sc produces the maximum v oc for a full light condition. reducing this current simulates lower light conditions. a more simple method is to supply a voltage to dcin with a series input resistor (r in ) as shown in figure 4. r in is calculated by (v oc C v pm )/imp where imp is the maximum power current. the supply current limit is set to i sc and the voltage of the supply is set to the desired v oc representing the desired sunlight. set the power supply to the maximum v oc to produce a full light condition. reducing the supply voltage simulates lower light conditions. to evaluate the ltc4013 mppt function follow the pro - cedure below: 1. set the dc2374a to operate in mppt mode with a three stage lead acid battery charging mode by positioning the jumpers as listed below: jp1 enable - on jp2 mppt - on jp3 mode2 C lo jp4 mode1 C hi jp5 ntc C int jp6 timer C cap jp7 pull_up pwr - dcin 2. with power off, connect a 0v to 16v , 6a power supply (ps2) to bat and gnd terminals with a series ammeter and a voltmeter as shown in figure 1. 3. with power off, connect a 5.1a load (load1) to bat and gnd terminals in parallel with ps2 as shown in figure 1. 4. set ps2 to 10v and turn on ps2 and load1. 5. with power off, connect a solar panel or solar panel simulator as previously discussed and refer to figure 3 and figure 4 as needed. 6. with a full or close to full light condition, observe that the battery charger current is only about 1a, 20%, and the voltage on the ismon terminal measures about 0.2vdc. dcin is also above the v pm point at this time. this is because the battery voltage is below the low battery threshold. if the battery voltage remains below low bat for 25 minutes then the charger cycle is terminated. the solar panel can supply more power to the charger than needed at this point. 7. slowly increase ps2 until the battery current jumps up to above 1a. the battery voltage is now above the low battery threshold. if the imp is less than the input current needed to provide full charge current, the ltc4013 will regulate the charge current below full load to obtain a dcin voltage near the v pm point for the measured v oc . 8. if possible, vary the light conditions for the solar panel or simulator and observe the charge current is adjusted to maintain the vmp for the measured v oc . note: if the charge current is reduced below c/10, ~ 500ma , and the battery voltage is over the low battery threshold, then the teoc timer will start even if the battery voltage is not approaching the absorption voltage. 9. if possible, return the light source to near full light condition. dc2374afa demo manual dc2374a
8 mppt quick start procedure 10. slowly increase ps2 until the battery current starts to decrease below 1a. the battery voltage is now approaching the absorption voltage. the timer will start if not already started from a low light condition. 11. when the timer has elapsed, the ltc4013 will switch to foat mode and the charge current will drop to near 0a until the battery voltage is reduced below the foat voltage. 12. when done, turn off and disconnect all loads and power supplies. figure 3. solar panel simulator using a dark solar panel or diode string + ? + ? ps1 v oc + v load2 isc load2 0a ? isc + ? + ? + ? + ? + ? ps2 0v ? 16v 6a + ? load1 5.1a + ? dc2374a f03 + ? solar panel or diode string dc2374afa demo manual dc2374a
9 mppt quick start procedure + ? + ? ps1 v oc isc r in v oc ? vmp + ? + ? + ? + ? ps2 0v ? 16v 6a + ? load1 5.1a + ? dc2374a f04 imp figure 4. solar simulator using a power supply with series resistor dc2374afa demo manual dc2374a
10 application information changing board configuration this board is optimized for a 24v to 14v lead acid bat - tery with 5a charge current, however it can be modified for other charging topologies, different charge currents, plus different dcin and battery voltages. the dc2374a can also accommodate higher power outputs. there are optional capacitors, inductor, fets, and a catch diode on the bottom of the board that can be used for larger com - ponents if needed. the layout was designed with ample copper and vias to provide enough thermal relief for 300w. refer to the data sheet for the sizing of all of the required components and changes as needed. no battery operation the ltc4013 will operate without a battery, however there needs to be at least 2v on the sense pin to startup. this can be a problem for batteries with a pack protect that opens when the battery is too low. one way to get around this is to add a series diode and resistor from intv cc to the bat pin to provide a weak pullup on the sense pin when no battery is present. v float must be greater than intv cc for this method. refer to the starting without a battery section of the ltc4013 data sheet for more information on this. connecting a high voltage battery when connecting a battery to the dc2374a demo board, the battery will instantaneously charge the bulk capaci - tors on the bat and the v in nodes. since the battery and capacitors have very low esr, the instantaneous current can be 10s or 100 s of amps when the battery is first connected and can damage the components in its path. it is recommended to pre-charge the bat terminals of the dc2374 a prior to connecting a low esr battery. this can be done by connecting the battery thru a current limiting resistor first, then short across the resistor. refer to the plugging in a battery section of the ltc4013 data sheet for more information. dc2374afa demo manual dc2374a
11 parts list item qty reference part description manufacturer/part number required circuit components 1 1 c1 cap, chip, x5r, 4.7f, 10%, 50v, 0805 tdk, c2012x5r1h475k 2 2 c2, c13 cap, chip, x7r, 0.1f, 10%, 50v, 0603 murata gr m188r71h104ka93d 3 2 c3, c4 cap, chip, x5r, 10f, 10%, 50v, 1210 murata, gr m32er61h106ka12 4 1 c5 cap, 68f, 50v, alum. electro, 20%, 8mm 10.2mm panasonic, eehz a1h680p 5 1 c14 cap, chip, x5r, 4.7f, 10%, 6.3v, 0603 tdk, c1608x5r0j475k 6 1 c17 cap, chip, x5r, 0.15f, 10%, 10v, 0402 murata, gr m155r61a154ke19j 7 3 c18-c20 cap, chip, x5r, 22f, 10%, 25v, 1210 avx, 12103 d226 kat1a 8 1 c21 cap, chip, x5r, 0.1f, 10%, 25v, 0402 tdk, c1005x5r1e104k050bc 9 1 c24 cap, 220f, 25v, alum. electro, 20%, 8mm 10.2mm panasonic, eehz c1e221p 10 2 c28, c31 cap, chip, x7r, 4.7nf, 10%, 25v, 0402 murata gr m155r71e472ka01d 11 1 c32 cap, chip, x5r, 0.22f, 10%, 25v, 0402 murata gr m155r61e224ke01d 12 1 d1 diode switch, 40v, 500ma, sod-123 diodes inc, b0540w- 7-f 13 1 l1 ind, smt, 6.8h, 20% wurth, 74439358068 14 2 m1, m2 mosfet, n-ch 40v, 22a, 3.3 3.3 mlp infineon, bsz025n04ls 15 2 m3, m4 mosfet, n-ch 40v, 35a , powerpack 1212-8 vishay siliconix, si s434dn 16 2 r2, r3 res, chip, 665k, 1%, 0.1w, 0402 vishay, crcw0402665kfked 17 1 r5 res, chip, 40.2k, 1%, 0.1w, 0402 vishay, crcw040240 k2fked 18 1 r7 res, chip, 10m, 1%, 1w, 1632 long side term susumu, prl1632-r010-f-t1 19 1 r8 res, chip, 10k, 1%, 1/16w, 0402 vishay, crcw040210 k0fked 20 1 r10 res, chip, 49.9k, 1%, 1/16w, 0402 vishay, crcw040249 k9fked 21 1 r16 res, chip, 499k, 1%, 1/16w, 0402 vishay, crcw0402499kfked 22 2 r17, r18 res, chip, 7.5k, 5%, 1/4w, 1206 vishay, crcw12067 k50jned 23 3 r19, r21, r25 res, chip, 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 24 1 r22 res, chip, 23.2k, 1%, 1/16w, 0402 vishay, crcw040223 k2fked 25 2 r23, r24 res, chip, 86.6k, 1%, 1/16w, 0402 vishay, crcw040286 k6fked 26 1 u1 60v sync. buck multi-chemistry battery charger linear tech., LTC4013EUFD#pbf dc2374afa demo manual dc2374a
12 item qty reference part description manufacturer/part number additional demo board circuit components 27 0 c6-c9, c22, c23 (opt) cap, chip, 1210 28 0 c10-c12 (opt) cap, 10mm 10.2mm 29 0 c15, c27, c30, c33 (opt) cap, chip, 0402 30 1 c16 cap, chip, cog, 33pf,5%, 50v, 0603 murata, gr m1885c2a330ja01 31 0 c25 (opt) cap, 8mm 10.2mm 32 1 c26 cap, chip, cog, 100pf, 5%, 50v, 0402 wurth elek, 885012005061 33 1 c29 cap, chip, cog, 220pf, 5%, 50v, 0402 wurth elek, 885012005063 34 0 d2 (opt) diode, schottky, powerdi 123 35 1 d3 diode, green, 0603 lite-on, ltst- c190kgkt 36 1 d4 diode, led, red, 0603 lumex, sml-lx0603srw-tr 37 0 l2 (opt) ind, smt, we-hci 1365 wurth, we-hci 1365 38 0 m5, m6 (opt) mosfet, n-ch, powerpack 1212-8 39 2 r1, r12 res, chip, 20, 1%, 1/16w, 0402 vishay, crcw040220 r0fked 40 5 r4, r6, r9, r11, r15 res, chip, 0 jumper, 1/16w, 0402 vishay, crcw04020000z0ed 41 3 r13, r20, r26 res, chip, 100k, 5%, 1/16w, 0402 vishay, crcw0402100kjned 42 0 r14 (opt) res, chip, 0402 hardware: for demo board only 43 4 e1, e4, e5, e8 turret, 0.09 dia mill-max, 2501-2-00-80-00-00-07-0 44 4 e2, e3, e6, e7 banana jack, non-insulated keystone, 575-4 45 10 e9 - e18 turret, 0.061 dia mill-max, 2308-2-00-80-00-00-07-0 46 3 jp1, jp3, jp4 header, 4pins, 2mm wurth, 62000411121 47 4 jp2, jp5-jp7 header, 3pins, 2mm wurth, 62000311121 48 7 jp1-jp7 (shunt) shunt 2mm 1 3 wurth, 60800213421 49 4 mh1-mh4 standoff, nylon 0.5" keystone, 8833 (snap on) 50 1 fab,printed circuit board demo circuit 2374a-3 parts list dc2374afa demo manual dc2374a
13 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 a a b b c c d d ext notes: unless otherwise specified 1. resistors: ohms, 0402, 1%, 1/16w 2. capacitors: 0402, 10%, 50v int 5v-35v * 24v nominal 13.6v float off on 5a cc lo cap ext_pwr dcin lo hi mid lo hi mid 0v - 40v on uvlo off * 21.5v - 35v jp1, enable = uvlo 5v-35v jp1, enable and jp2, mppt = on designates sgnd node fsw = 500khz lb = 10.4v teoc = 3.33hr s s s s s intvcc intvcc s s intvcc s s intvcc s dcin dcin s s s s 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 demo circuit 2374a 1 1 60v synchronous buck n/a LTC4013EUFD nc mm 06 - 06 - 16 multi-chemistry battery 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 demo circuit 2374a 1 1 60v synchronous buck n/a LTC4013EUFD nc mm 06 - 06 - 16 multi-chemistry battery 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 demo circuit 2374a 1 1 60v synchronous buck n/a LTC4013EUFD nc mm 06 - 06 - 16 multi-chemistry battery charger revision history description date approved eco rev mm production - 3 06 - 06 - 16 revision history description date approved eco rev mm production - 3 06 - 06 - 16 revision history description date approved eco rev mm production - 3 06 - 06 - 16 e4 gnd c21 0.1uf 25v jp5 ntc l2 opt we-hci 1365 + c25 opt c27 opt e6 r25 100k u1 LTC4013EUFD mode1 11 lb 9 vin 27 clkout 13 ismon 6 tmr 10 sgnd 29 mppt 3 pgnd 26 ntc 17 dcin 2 mode2 12 fb 18 sync 14 stat0 7 enab 5 rt 15 sw 23 stat1 8 ith 16 bg 24 intvcc 25 vin_s 28 sense 20 bat 19 infet 1 fboc 4 tg 22 bst 21 jp1 enable e12 stat1 c17 0.15uf 10v + c24 220uf 25v m5 opt r9 0 r17 7.5k 1206 r20 100k 5% c30 opt tpa2 r6 0 e5 bat r23 86.6k + c12 opt jp6 timer e17 gnd c14 4.7uf 0603 6.3v e14 clkout e10 ext_pwr r16 499k r14 opt e3 r21 100k c3 10f 1210 c19 22f 1210 25v + c5 68uf eehza1h680p r26 100k 5% c29 220pf r15 0 tpb1 e11 stat0 r4 0 c26 100pf c7 opt 1210 m3 sis434dn jp2 mppt r13 100k 5% e7 r7 10m 1w c20 22f 1210 25v c31 4.7nf 25v c13 0.1uf 0603 c16 33pf 0603 r11 0 r24 86.6k c15 opt r1 20 e13 ismon c2 0.1uf 0603 + c11 opt c28 4.7nf 25v c8 opt 1210 c23 opt 1210 e18 gnd d4 red r22 23.2k l1 6.8h 74439358068 c32 0.22uf 25v e1 dcin tpa1 m2 bsz025n04ls r18 7.5k 1206 m4 sis434dn c6 opt 1210 c22 opt 1210 e16 ntc r19 100k tpb2 e8 gnd d3 green c4 10f 1210 m1 bsz025n04ls jp3 mode2 e15 gnd r12 20 r8 10k c1 4.7f 0805 d2 opt powerdi123a jp4 mode1 r10 49.9k r5 40.2k jp7 pull_up pwr d1 b0540w e2 r2 665k c33 opt c18 22f 1210 25v + c10 opt r3 665k c9 opt 1210 e9 sync m6 opt dc2374afa demo manual dc2374a
14 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 0916 rev a ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the 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 dc2374afa demo manual dc2374a

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