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another question for wireless EVM kit

Sukkyu Sun
Prodigy 60 points

1

2

picture 1 is my Vrect and output voltage is 5V(j3)

i tested it using source meter 

first 510512A input 5V,

input current is about 150mA

current fluctuation is too high(130mA-170mA)

output 4V,

output current is like picture 2 about 55mA

in case the efficiency is about 30% am i right??

  • 0
    TI__Genius 14890 points

    Please use DC coupling for the RECT signal scope plot.  I expect it looks like it should.  The pulses on RECT are the normal communication from the RX to the TX.  Add OUT to the scope plot, also using DC coupling.

    The RECT communication pulses will have an impact on the efficiency measurements.

    Based on your photo, it does not appear you have any load on OUT, only the source meter.  You must have a load to determine the efficiency.  

    Dick