User Guide Rev 2.0
www.semtech.com
8 of27
TSDMTX-19V3-EVM
May-18
Semtech
Measure Efficiency
By measuring the power from the receiver’s VOUT+ and GND pins in comparison to the power entering the
transmitter EVM, you can calculate the efficiency of the power transfer through the system. For the EVMs used
here, the diagram below demonstrates that efficiency is a function of output current, and runs about 83% at
nominal power level (19V/1.0A), assuring good efficiency and minimal heat dissipation concerns.
Rx is Semtech TSDMRX-19V/20W-EVM which can support up to 20W load under normal condition.
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
Efficency VS current
