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www.semtech.com wireless charging user guide tswirx -5v2-evm low power wireless charging receiver (rev 3.00)
TSWIRX-5V2-EVM www.semtech.com 1 of 15 user guide introduction the semtech TSWIRX-5V2-EVM is an evaluation platfor m for the test and experimentation of a wireless charging receiver based on the semtech ts51223 full y-integrated ic for wireless power receiver applications. this evaluation module, in conjunctio n with its compatible transimitter - tswitx-g2- evm/tswitx-g4-evm, providing a complete system solu tion for low-power, wearable power transmission and receiving. objectives the objective of this user guide is to provide a fa st, easy and thorough method to experiment with and evaluate the semtech solutions for wireless chargin g systems. sufficient information is provided to support the engineer in all aspects of adding wirel ess charging support to their products. semtech off ers a range of solutions to meet the needs of a wide ra nge of system developers. developers are provided with all the information on how this evm was built as a starting point for their own designs based on the ts51223. table of contents wireless charging concepts ........................ ................................................... ......................... 2 product description ............................... ................................................... ............................... 3 standard use ...................................... ................................................... ................................. 4 documentation ..................................... ................................................... ................................ 7 a. block diagram ..................................... ................................................... ...................... 7 b. schematic ......................................... ................................................... ........................ 8 c. bill of materials bom ........................... ................................................... ................. 10 d. board layout ...................................... ................................................... ..................... 11 e. board layers ...................................... ................................................... ..................... 12 faqs .............................................. ................................................... .................................... 13 next steps ........................................ ................................................... .................................. 14
TSWIRX-5V2-EVM www.semtech.com 2 of 15 user guide receiver transmitter control electromagnetic flux controller coil driver power supply supply regulation rectifier end equipment power wireless charging concepts wireless power transfer is, essentially, a transfor mer. power is provided to a primary coil which prod uces an electromagnetic (em) field. in this field, a sec ondary coil is placed. the em field induces a curre nt into the secondary coil, providing power to whatever it is connected to. however, unlike a conventional power transformer th at operates at line frequencies and requires an iro n core for efficiency, low power wireless power syste ms for wearable devices have been designed to operate in the 1 mhz range, and thus can perform ef ficiently with an air core. as such, the primary an d secondary windings, if closely spaced, can be in se parate devices, the primary being part of a transmi tter and the secondary within a receiver. this implement ation can also be described as a radio broadcast process, and as such, these transformer coils can a lso be seen as antennas with equal validity, and th e two terms will be used interchangeably in this text . wireless power systems differ in another major aspe ct from conventional transformers, in that they are intelligently managed. a transmitter will only prov ide power when a receiver is present, and only prod uce the amount of power requested by the receiver. the intelligent management of the wireless power transmission process is achieved though the program ming of the transmitter-resident ts80002, which first searches for a receiver. once found, the rece iver informs the transmitter of its power requireme nts, and transmission begins. the system then verifies t he right amount of power is being sent. the receive r continually provides ongoing requests for power to maintain the transaction. if the requests cease, th e transaction terminates. via this protocol, even com plex charging patterns can be supported, as the transmitter can provide varying amounts of power at different times, as requested by the receiver. sho uld the receiver require no further power, such as when a battery charge is completed, it can request no further power be sent, and the transmitter will red uce its output accordingly. wireless power systems have been broken into three basic power categories. wearable devices, such as headsets, wrist-band devices, medical sensors, a nd so forth - all operate in the low power range, u p to 5 watts. medium power devices, in the 5- to 15-watt range, include most handheld devices, such as cell phones, tablets, and medical electronics. high powe r wireless systems are intended to support devices such as power tools, radio controlled (rc) device s such as drones, and other equipment requiring 15 to 100 watts of power.
TSWIRX-5V2-EVM www.semtech.com 3 of 15 user guide product description the TSWIRX-5V2-EVM evaluation module is a ready-to- use demonstration platform allowing testing of approximately 1.25 watt of wireless power transmiss ion. its output power will range from about 0.5 to 2 watts depending on antenna coil selection. the receiver is coupled with its compatible transmi tter module, the semtech tswitx-g2-evm/tswitx- g4-evm, to form a complete wireless power transmiss ion system. together, they allow a variety of experiments to easily be performed in order to lear n more about the behavior of the system. those who wish to develop their own board, or integ rate this functionality into an existing system can use the evm as a starting point for their design, as it demonstrates a working model from which to proceed . toward this end, all documentation for the evm is p rovided to make the process as efficient as possibl e. the key technology in the evm is the semtech ts5122 3, which is a fully-integrated wireless power receiver for low-power, wearable applications that require a space-saving solution. its 1 mhz switchin g frequency enables the use of small inductive compon ents resulting in minimal board space and reduced costs. it integrates a wide range of protection cir cuitry including input supply under-voltage lockout , output voltage soft start, current limiting, and thermal s hutdown. in this user guide, an introduction will be provide d to the evaluator for how to use the evm for wirel ess power transmission as well as how the tswitx-g2-evm /tswitx-g4-evm can be used in conjunction with it. once the system is set up and working, a selection of tests and activities will be described that the evaluator can choose to perform.
TSWIRX-5V2-EVM www.semtech.com 4 of 15 user guide standard use the TSWIRX-5V2-EVM is easy to set up and use. conne ct a usb cable from any usb port capable of driving up to 2 watts (most pcs will suffice) to th e usb port on the tswitx-g2-evm/tswitx-g4-evm. on application of power, its green led should light , indicating the board is now active. at this point, the transmitter evm is ready to tran smit power. a few times each second, the transmitte r emits a ping of energy in search of a compliant r eceiver in range. when in range, the receiver is powered by the ping sufficiently to be able to announce its presence to the transmitter, and a transaction begins. the transmit ter provides a small amount of power to the newly discovered receiver, so it can tell the transmitter what its power requirements are. at the completion of this handshake, the transmitte r begins providing the requested power. during powe r transfer, the receiver continuously communicates wi th the transmitter, actively directing the process. in this way, it is assured that power is only sent whe n and how it is required by an available and desiro us receiver C and in the way that is compatible with t he requirements of the receiver. if required, a rec eiver can actively increase or decrease its power request , and the transmitter will act accordingly. as such , equipment with complex charging requirements can be precisely supported and only the desired amount of power is provided.
TSWIRX-5V2-EVM www.semtech.com 5 of 15 user guide evm receiver tests a variety of tests can be performed with the use of the tswitx-g2-evm/tswitx-g4-evm transmitter module. connect a usb cable from any usb port capable of dr iving up to 2 watts (most pcs will suffice) to the usb port on the tswitx-g2-evm/tswitx-g4-evm. on app lication of power, its green led should light, indicating the board is now active. in order to use the TSWIRX-5V2-EVM as a target rece iver, simply place the receiver over the target cir cle (the primary coil or transmitter antenna) on th e transmitter evm module. you can measure 5.2v at j 2 connector, indicating power is being received. the evms purpose is to receive power; next you can decide what to deliver that power to. the user has a number of possible options to choose from. the optimal load to select would be a programmable dc electronic load. a load box can e asily be set to draw a selected current or power at the turn of a knob, making them very flexible and e asy to use in observing power supply operation in general. if a load box is not available, a power re sistor decade box is nearly as convenient, as it ca n easily be set to any desired resistance to simulate a range of load conditions. if need be, a selectio n of resistors could be used as test loads, though witho ut the ease of modification of the prior options. b e sure the test load is rated for at least the amount of p ower being tested. finally, any device that uses a 5 volt input up to 1.25 watt of power can be used as a tes t load should that be desired. whatever load is selected, wires must be run from t he vout+ and gnd pins of the receiver evm to the selected test load, as per the illustration above. once the load is added, the receiver evm can be use d to perform a variety of tests. connect a dc voltmeter across the vout+ and gnd pin s to monitor the voltage being output to the load, and a dc ammeter in series with the vout+ line. set levels to allow for up to 10 volts and 1 amp to be observed. with no load selected, place the receiver on the ce nter of the transmitter target circle. once transmi ssion begins, you should observe approximately 5 volts an d 0 amperes on the meters. apply a variety of loads to observe performance up to one the watt level. voltage should remain nearly constant, and current should follow the p=v*i relat ionship. experiment with the maximum power that can be drawn before the system reaches its limits and o utput voltage falls off.
TSWIRX-5V2-EVM www.semtech.com 6 of 15 user guide measure efficiency by measuring the power from the receivers vout+ an d gnd pins in comparison to the power entering the transmitter evm, you can determine the efficien cy of the power transfer through the system. the diagram below was obtained from the tswitx-g4-e vm and TSWIRX-5V2-EVM. when measuring efficiency, be sure to remove the jumpers on the re ceiver and transmitter that enable the status leds, as these will affect the measurements. 0.00% 10.00% 20.00% 30.00% 40.00% 50.00% 60.00% 70.00% 0ma 10ma 20ma 30ma 40ma 50ma 60ma 70ma 80ma 90ma 100ma 110ma 120ma 130ma 140ma 150ma 160ma 170ma 180ma 190ma 200ma 210ma 220ma 230ma 240ma 250ma efficiency vs load
TSWIRX-5V2-EVM www.semtech.com 7 of 15 user guide documentation the following sections document the hardware design of the TSWIRX-5V2-EVM. this information can be used to better understand the functionality of the design, as well as assist in creating your own hard ware solution based on this design a. block diagram the TSWIRX-5V2-EVM may be divided into a number of sub-blocks as show in the diagram below: antenna: transmit C primary coil providing power to the receiver; pa rt of tswitx-g2-evm/tswitx-g4- evm antenna: receive C secondary coil in the flux field of the transmit antenna; part of the 1 mhz resonant tank rectifier C converts ac voltage from the antenna to positive values; fet based for high efficiency conversion regulator - based on the ts51223; converts rectified input t o regulated 5v output; includes protection circuitry comm. generator - produces the handshake signal telling the tran smitter to provide power comm. modulator CC sends the handshake signal to the transmitter battery/load C end equipment to be powered by the wireless rece iver
TSWIRX-5V2-EVM www.semtech.com 8 of 15 user guide b. schematic below are two copies of the schematic for the tswir x-5v2-evm. the first will be best when viewed on- screen, as it is normally oriented and can be zoome d in on for readability. the second will allow bett er use in print-out form, as the landscape orientation allows a larger image to be provided. for each, annotation has been added to indicate which part of the block diagram each component is a member of. 4.7nf 50v c4 22uf 25v c2 gnd 47nf c5 22uf 10v c8 100nf 25v c3 gnd gnd 4.7uh l1 gnd 4.7nf 50v c6 4.7nf 50v c7 vout 10k r3 46k r1 gnd np c1 pdc 1 freq 2 alert 3 mod_cfg 5 mod_en 4 gnd 6 j3 external mcu (optional) 75k r2 4.7k r4 pdc gnd + 1 - 2 out j2 5v output vac1 a1 pdc a2 sw c2 bst b4 gnd b1 pdc b2 sw c3 comm1 a3 gnd c1 sw c4 freq d3 fb a4 gnd d1 pdc d2 alert b3 mod_cfg d4 vac2 e1 pdc e2 comm2 e3 mod_en e4 u1 ts51223 gnd gnd 47nf c12 gnd gnd 60k r5 gnd 22uf 10v c9 gnd 22uf 10v c10 gnd 22uf 10v c11 x5r capacitors. will only have 15-20% of the rated capacitance at 5v. some can be omitted if the load has capacitance. vac1 vac2 pdc sw fb freq alert mod_en mod_cfg rx coil ac1 ac2
TSWIRX-5V2-EVM www.semtech.com 9 of 15 user guide 4.7nf 50v c4 22uf 25v c2 gnd 47nf c5 22uf 10v c8 100nf 25v c3 gnd gnd 4.7uh l1 gnd 4.7nf 50v c6 4.7nf 50v c7 vout 10k r3 46k r1 gnd np c1 pdc 1 freq 2 alert 3 mod_cfg 5 mod_en 4 gnd 6 j3 external mcu (optional) 75k r2 4.7k r4 pdc gnd + 1 - 2 out j2 5v output vac1 a1 pdc a2 sw c2 bst b4 gnd b1 pdc b2 sw c3 comm1 a3 gnd c1 sw c4 freq d3 fb a4 gnd d1 pdc d2 alert b3 mod_cfg d4 vac2 e1 pdc e2 comm2 e3 mod_en e4 u1 ts51223 gnd gnd 47nf c12 gnd gnd 60k r5 gnd 22uf 10v c9 gnd 22uf 10v c10 gnd 22uf 10v c11 x5r capacitors. will only have 15-20% of the rated capacitance at 5v. some can be omitted if the load has capacitance. vac1 vac2 pdc sw fb freq alert mod_en mod_cfg rx coil ac1 ac2
TSWIRX-5V2-EVM www.semtech.com 10 of 15 user guide c. bill of materials bom below is a listing of the parts used in the tswirx- 5v2-evm. note that only a few dozen components were required to implement the complete receiver so lution. an excel spreadsheet file with this informa tion is available on the semtech website as an added con venience. sn designator description footprint manu- facturer manufacturercode quanti- ty 1 c1 np capc0402l 1 2 c2 0805 22uf 50v x5r capc0805l tdk c2012x5r1e226m125ac 1 3 c3 0402 100nf 50v capc0402l 1 4 c4 0603 4.7 nf 50v c0g capc0603l tdk c1608c0g1h 472 j080aa 1 5 c5, c12 0402 47nf 10v capc0402l 2 6 c6, c7 0402 4.7 nf 50v capc0402l 2 7 c8, c9, c10, c11 0603 22uf 10v x5r capc0603l tdk c1608x5r1a226m080ac 4 8 l1 0805 4.7uh resc0805l tdk vls201612cx-4r7m 1 9 r1 0402 46k4 resc0402l 1 10 r2 0402 75k resc0402l 1 11 r3 0402 10k resc0402l 1 12 r4 0402 4.7k resc0402l 1 13 r5 0402 60k4 resc0402l 1 14 j2 header 12pin 2.0mm 2pin 2.0mm 1 15 j3 header 16pin 2.0mm 6 pin 2.0mm 1 16 u1 wireless power receiver wcsp40p18 0x220-20vn semtech ts51223 1 17 ac1,ac2 coil e&e es y31 - 60150f 1
TSWIRX-5V2-EVM www.semtech.com 11 of 15 user guide d. board layout the diagram below shows the locations of the compon ents used in the TSWIRX-5V2-EVM pcb.
TSWIRX-5V2-EVM www.semtech.com 12 of 15 user guide e. board layers the TSWIRX-5V2-EVM pcb is based on a four layer des ign as shown below. the ground plane in layer two is recommended to reduce noise and signal cross talk. the evm placed all components on the top of the board for easier evaluation of the system. end product versions of this design can be made significantly smaller by distributing components on both sides of the board. the gerber files for this artwork can be downloaded from the semtech web page . top layer ground plane signal layer bottom layer
TSWIRX-5V2-EVM www.semtech.com 13 of 15 user guide faqs q: what output voltage is provided by the tswirx-5v 2-evm system? a: the output is 5 volts, with a maximum power 1.25 watt. q: is the TSWIRX-5V2-EVM compliant with qi or anoth er wireless transmission standard? a: these low power wearable solutions are not based on existing standards in order to employ smaller coils and other optimizations that better suit the low power system environment. q: does the evm part number represent something in particular? a: yes. the part number is broken into a prefix, ma in body, and suffix, separated by dashes. the prefi x is comprised of three two letter groupings that each h elp define the product represented. as such, the pa rt number can be read as follows: prefix characters: 1+2 = company : ts = triune/semtech 3+4 = environment : dm = dual mode wi = wearable inf rastructure 5+6 = type : tx = transmit rx = receive mid-section = device voltage or wattage suffix = equipment type: evm = evaluation module mod = production module thus, the TSWIRX-5V2-EVM is a wearable infrastructu re, 5 volt receiver evaluation module provided by semtech. q: does the TSWIRX-5V2-EVM implement foreign object detection (fod)? a: fod detection is an important protection in high er power systems, but in low power wearable infrastructure systems there is no risk of overheat ing, rendering fod management unnecessary. q: what if my questions werent answered here? a: go to the semtech website as described on the ne xt page. an updated faq for the tswirx-5v2- evm is maintained there and may contain the answers youre looking for. your local semtech fae can also assist in answering your questions.
TSWIRX-5V2-EVM www.semtech.com 14 of 15 user guide next steps for more information on wireless power, go to the s emtech webpage at: https://www.semtech.com/power-management/wireless-c harging-ics/ you may also scan the bar code to the right to go t o the above web page: there you can find the downloadable copies of the s chematic, bom, and board artwork, as well as additional information on how to obtain semtech wir eless power products, from the chip level all the w ay to complete board modules, as your needs require.
TSWIRX-5V2-EVM www.semtech.com 15 of 15 user guide important notice information relating to this product and the applic ation or design described herein is believed to be reliable, however such information is provided as a guide only and se mtech assumes no liability for any errors in this d ocument, or for the application or design described herein. semtech the latest relevant information before placing ord ers and should verify that such information is current and complet e. semtech reserves the right to make changes to th e product or this document at any time without notice. buyers sh ould obtain warrants performance of its products to the specifications applicable at the time of sale, and all sales are made in accordance with semtechs sta ndard terms and conditions of sale. semtech products are not designed, intended, author ized or warranted to be suitable for use in life-support applications, devices or systems, o r in nuclear applications in which the failure could be reasonably expected to result in p ersonal injury, loss of life or severe property or environmental damage. inclusion of semt ech products in such applications is understood to be undertaken solely at the customer s own risk. should a customer purchase or use semtech products for any such unauthorized applicat ion, the customer shall indemnify and hold semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs dam ages and attorney fees which could arise. the semtech name and logo are registered trademarks of the semtech corporation. all other trademarks a nd trade names mentioned may be marks and names of semtech o r their respective companies. semtech reserves the right to make changes to, or discontinue any products descri bed in this document without further notice. semtec h makes no warranty, representation or guarantee, express or i mplied, regarding the suitability of its products f or any particular purpose. all rights reserved. ? semtech 2015 contact information semtech corporation 200 flynn road, camarillo, ca 93012 phone: (805) 498-2111, fax: (805) 498-3804 www.semtech.com

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