1 description lt c4123edc low power wireless charger demonstration kit demonstration circuit dc2302a is a kit of the dc2300a demonstration board, featuring the lt c ? 4123edc , and the dc2301 a single switch transmitter demonstration board. the dc2300 a can charge a single nimh battery at up to 25ma, with an air gap of 0.8mm to 4.0mm. the dc2300a detects zinc-air primary cells and will not charge them. l , lt, ltc, ltm, linear technology, the linear logo and timerblox are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. p erformance s ummary design files for this circuit board are available at http://www.linear.com/demo/dc2302a specifications are at t a = 25c symbol parameter conditions min typ max units v in dc2301a voltage input i vin 0.5a 4.5 5.5 v i bat dc2300a battery charger current v cc = 3v ~ 5v, dc2300a.r1 = 953 24 26 ma figure 1. demonstration kit with battery figure 2. typical application circuit v in t x coil led l rx 13h c rx 33nf c in 4.7f r prog 953 transmitter circuit air gap acin bat chrg gnd prog 1.5v nimh battery 4123 ta01 ltc4123 v cc i charge = 25ma max + ? + dc2302afa demo manual dc2302a
2 demo boar d p roce d ure refer to figure 5 for the 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 signal and gnd terminals. see figure 6 for proper scope probe technique. 1. set ps1 to 1.3v and turn on. 2. plug a micro-usb cable into dc2301.j1 , the other end of the cable should go to a computer usb port or a 5v wall charger. 3. verify that dc2301a.d1 is lit. dc2301a.d1 is between the boards, near the front face. 4. the ltc4123 edc spends the first 90s after power up testing for either a reverse battery or a zinc-air pri - mary battery. dc2300a.d1 should be blinking slowly. a m1 should read 25ma . vm1 should read between 3v and 5v. the ltc4123 edc tests for a zinc-air battery by applying the programmed charge current, and checking to see if v(bat) rises above 1.65v. if the batter y is absent, reversed or zinc-air, dc2300a. d1 will start blinking rapidly. 5. turn off and disconnect p s1, am1 and vm1. install the p675 nimh battery in the dc2300a.bh1 battery holder. see figure 4 for proper insertion. warning : improper insertion may short battery. figure 3. dc2300a and dc2301a demo boards (a) dc2300a top (c) dc2300a bottom (b) dc2301a top (d) dc2301a bottom dc2302afa demo manual dc2302a
3 figure 4. proper insertion of battery in demo kit demo boar d p roce d ure (a) (b) (c) dc2302afa demo manual dc2302a
4 demo boar d p roce d ure figure 5. dc2300a mounted on top of dc2301a figure 6. measuring input or output ripple 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. dc2302a f03 ? + +? ps1 + ? 2v bipolar supply am1 vm1 0.1a power only micro-usb to host or 5v wall charger dc2302afa demo manual dc2302a
5 t heory of o peration the dc2302 a kit demonstrates operation of the ltc4123 edc low power wireless charger. the kit is composed of the dc2300 a wireless power transfer (wpt) receiver and the dc2301a wpt transmitter. dc2300a C low power battery charger board featuring the LTC4123EDC the ltc4123 edc integrates a low power cc-cv linear charger optimized for nimh cells. the LTC4123EDC also contains a low leakage diode for rectifying the output of the wpt resonant tank. the dc2300 a wpt resonant tank is set to 244khz . tested receive coils are listed in table 1. the cc-cv charger will operate with a v cc as low as 2.2v, and charge a nimh battery to 1.61v (t a = C10c ). the charge voltage is temperature dependent, a temperature coefficient of C2.5mv/ c, and a typical charge voltage of 1.5075, at room (see figure 7). the ltc4123 edc has a fault state machine that checks for battery reversal and presence of a zinc-air primary cell in the first 90s after v cc is applied. the ltc4123 edc has an on-die temperature sensing that will shut down the charger if the sensed temperature is too high or low. the wpt for the LTC4123EDC is implemented as res- onant power transfer, with the LTC4123EDC rectifying the resonant tank voltage to generate v cc (see figure 9). dc2301a C wireless power transmitter board featuring the ltc6990idcb the dc2301 a is a wireless power transmitter board using an ltc6990 idcb timerblox ? , followed by a zero voltage switching class c amplifier. the ltc6990 idcb is programmed to generate a 244khz square wave, but the class c amplifier tank is resonant at 315khz, resulting in zero voltage switching (see figure 8). tested transmit coils are listed in table 2 . figure 7. charge voltage vs temperature (placeholder) figure 8. dc2301a v in = 5v, air gap = 4mm figure 9. dc2300a v in = 5v, air gap = 4mm dc2302afa demo manual dc2302a 1.380 1.400 1.420 1.440 1.460 1.480 1.500 1.520 1.540 1.560 r prog = 23.7k 1.580 1.600 v bat (v) dc2302a f06 charge voltage charge voltage max charge voltage min x-axis (?) dc2302a f07 m1.g temperature (c) m1.d x-axis (?) dc2302a f08 v cc acin ?5 10 25 40 55 70
6 p arts list table 1. tested lrx coils vendor part number url wurth 760308101208 http://www.we-online.com inter-technical l4120r19 http://www.inter-technical.com/index.php?page=products# sunlord swa12r10h17c01b http://www.sunlordinc.com/ table 2. tested ltx coils vendor part number url wurth 760308103206 http://www.we-online.com inter-technical l41200t23 http://www.inter-technical.com/index.php?page=products# sunlord swa28r15h08c01b http://www.sunlordinc.com/ t heory of o peration operating the dc2302a wpt kit from a usb port the dc2302 a wpt demo kit to can comply with the requirements for a usb peripheral. one requirement is the 50c inrush charge specification, which drives the maximum input capacitance. another requirement is that a usb peripheral must draw less than 100ma, until nego - tiating for more. the dc2302a wpt kit does not contain a microcontroller to negotiate for more than 100ma , so, it must operate at less than 100ma. dc2301a.c2 can be changed to 4.7f, which in parallel with dc2301a.c1 = 4.7f , will be less than the 10f. the dc2302 a will then meet the 50c inrush charge specification. all air gaps mentioned below are the coil face to coil face distances: 0.8mm gap: usb.v cc current = 102ma @ usb.v cc = 4.5 ~ 5.5v 300mv of 255khz ripple on usb.v cc dc2300a.v(bat) = 1 ~ 1.4v 2.4mm gap: usb.v cc current = 84ma @ usb.v cc = 4.5 ~ 5.5v 280mv of 255khz ripple on usb.vcc dc2300a.v(bat) = 1 ~ 1.4v 4.0mm gap : usb.v cc current = 73ma @ usb.v cc = 4.5 ~ 5.5v 240mv of 255khz ripple on usb.vcc dc2300a.v(ba t) = 1 ~ 1.4v s o , if the gap is kept greater than 1.5mm and dc2301a.c2 4.7f, the dc2302a should meet the compliance require - ments for a usb peripheral. the dc2302a will not support suspend mode operation. dc2302afa demo manual dc2302a
7 item qty reference part description manufacturer/part number dc2300a required circuit components 1 1 c1 cap, chip, x5r, 4.7f, 10%, 10v, 0402 samsung, cl05a475kp5nrnc 2 1 crx cap, chip, c0g, 33nf, 5%, 50v, 1206/0805 tdk, c2012c0g1h333j125aa 4 1 lrx receive antenna, 13h, 10%, 10mm wurth, 760308101208 5 1 r1 res, chip, 953, 1%, 1/16w, 0402 vishay, crcw0402953rfked 6 1 u1 low power wireless charger, 2mm 2mm dfn6 linear tech., LTC4123EDC additional demo board circuit components 1 0 c2-opt cap, chip, x5r, 1f, 10%, 16v, 0402 tdk, c1005x5r1c105k 2 1 d1 led, red, smt, 0603 rohm, sml-311utt86 3 1 r2 res, chip, 4.7k, 5%, 1/16w, 0402 vishay, crcw04024k70jned hardware: for demo board only 1 1 bh1 coin cell battery retainer, 11.6mm keystone, 2996 2 7 e1, e2, e3, e4, e5, e6, e7 turret, 0.061" mill-max, 2308-2-00-80-00-00-07-0 dc2301a required circuit components 1 1 c2 cap, chip, x5r,100f, 20%,6.3v,1206 murata, grm31cr60j107me39l 2 1 ctx1 cap, chip, c0g, 33nf, 1%, 25v, 1206/0805 kemet, c0805c333f3gactu 3 1 ctx2 cap, chip, c0g, 1nf, 5%, 50v, 0603 tdk, c1608c0g1h102j080aa 4 1 lt x transmit antenna, 7.5h, 10%, 28mm 15mm wurth, 760308103206 5 1 m1 mosfet, n-ch 20v, 6a, sot23-3 vishay, si2312cds-t1-ge3 6 1 r1 res, chip, 205k, 1%, 1/16w, 0402 vishay, crcw0402357kfked 7 1 u1 timerblox: voltage controlled silicon oscillator, 2mm 3mm dfn6 linear tech., ltc6990idcb additional demo board circuit components 1 1 c1 cap, chip, x5r, 4.7f, 20%, 6.3v, 0402 tdk, c1005x5r0j475m 2 1 d1 led, red, smt, 0603 liteon, ltst-c193krkt-5a 3 1 j1 usb2.0 micro-b receptacle, rt, reversed, 1932788-1 te, 1932788-1 4 1 r2 res, chip, 2.2k, 5%, 1/16w, 0402 vishay, crcw04022k20jned hardware: for demo board only 1 2 e1, e2 turret, 0.061" mill-max, 2308-2-00-80-00-00-07-0 p arts list dc2302afa demo manual dc2302a
8 s chematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 0.8 - 1.7v 25ma 244khz opt unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 2.2 - 5.5v size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2300a 1 1 low power wireless charger n/a LTC4123EDC nc george b. 10 - 5 - 15 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2300a 1 1 low power wireless charger n/a LTC4123EDC nc george b. 10 - 5 - 15 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit 2300a 1 1 low power wireless charger n/a LTC4123EDC nc george b. 10 - 5 - 15 revision history description date approved eco rev george b. production fab 2 10 - 5 - 15 - revision history description date approved eco rev george b. production fab 2 10 - 5 - 15 - revision history description date approved eco rev george b. production fab 2 10 - 5 - 15 - r1 953 e2 gnd e6 bat e1 vcc e4 prog bh1 1 2 u1 LTC4123EDC 1 acin 2 vcc 3 chrg 4 prog 5 bat 6 gnd 7 gnd crx 33nf 50v 1206/0805 5% lrx 13h +/-10% c1 4.7f 10v d1 1 2 e7 chrg e5 gnd c2 1uf 16v e3 acin r2 4.7k dc2302afa demo manual dc2302a
9 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. s chematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 4.5 - 5.5 v 0.5a 244khz 315khz unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit2301a 1 1 single switch transmitter for LTC4123EDC n/a LTC4123EDC nc george b. 10 - 1 - 2015 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit2301a 1 1 single switch transmitter for LTC4123EDC n/a LTC4123EDC nc george b. 10 - 1 - 2015 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 demo circuit2301a 1 1 single switch transmitter for LTC4123EDC n/a LTC4123EDC nc george b. 10 - 1 - 2015 c1 4.7uf 6.3v e1 vin d1 c2 100uf 6.3v 1206 ltx 7.5h +/-10% r2 2.2k e2 gnd r1 205k j1 usb micro b receptacle te, 1932788-1 vbus 1 d- 2 d+ 3 id 4 gnd 5 gnd 7 gnd 6 u1 ltc6990idcb oe 4 gnd 5 set 3 div 2 v+ 1 out 6 gnd 7 ctx1 33nf 1206/0805 25v ctx2 1nf 0603 m1 si2312cds 3 1 2 dc2302afa demo manual dc2302a
10 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 0316 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 dc2302afa demo manual dc2302a
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