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TSDMTX-5V2-EVM Datasheet(PDF) 8 Page - Semtech Corporation |
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TSDMTX-5V2-EVM Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 24 page User Guide www.semtech.com 7 of 23 TSDMTX-5V2-EVM Rev1.0 Observe Coil Signals The following information is not required in order to use the EVM, as what can be observed below is entirely managed by the Semtech TS80000 Wireless Controller. However, it allows the observer an opportunity to see how the receiver and transmitter actively manage the wireless power process. If you wish to observe the intrinsic wireless process, place an oscilloscope probe on one antenna lead, with the probe ground run to the board ground (one of the fastener screws will suffice). Be sure the scope can handle signals up to 100 volts. While the EVM power supply is only 5 volts, the antenna is part of a resonant circuit where considerably higher voltages are developed. To observe the search ping, apply power to the transmitter and remove the receiver from the target zone. The scope should display a ‘chirp’ of 0.5 to 1mSec in duration with an initial peak of 10 to 20 volts. The frequency within the envelope of the chirp is in the 100-150 kHz range, which is the normal range of Qi and PMA systems. Next, place the receiver on the transmitter target. With the scope set to 0.5 to 1 uSec and 10 to 20 volts per division, you should observe a signal that is a composite of the sinusoidal power signal with a digital ‘notch’ in the sinewave which is produced by the communication between the receiver and transmitter. Note as you vary the load and the location of the receiver on the target that the amplitude and frequency of the coil signal changes. The greater the load, the more signal is sent to transfer the power required by the load. Similarly, the less well coupled the receiver antenna is to the transmitter coil, the more power must be sent to compensate for the inefficient misalignment. You may note voltages near 140 volts peak- to-peak in the most demanding conditions. Measure Efficiency By measuring the power from the receiver’s VOUT+ and VOUT- pins in comparison to the power entering the transmitter EVM, you can determine the efficiency of the power transfer through the system. The diagram below, for EVMs similar to those used here, demonstrates efficiency is a function of output current, and runs about 75% beyond the mid-power point, assuring good efficiency and minimal heat dissipation concerns. With normal USB2.0 input, TSDMTX-5V2-EVM will work PMA, it can carry up to 5W. 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 5Voutput Rx current load(A) Efficiency VS Rx load Vin=5V |
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