EK31
EK31U Rev A
9
TEST ASSEMBLY
EQUIPMENT NEEDED
1. Power supply
2. Function Generator
3. Oscilloscope
4. Proper heat sinking system (if operating at high current)
TEST SETUP
Connect the power supply to the terminal strip. Connect the BNC cable from the function generator to
the BNC connector marked VIN, mounted on the board. Connect the load to the terminals on the terminal
strip. Refer to the amplifier datasheet for typical values of input voltage, frequency and supply voltage. Input
and output waveforms can be checked on an Oscilloscope by connecting it to the test points mounted on the
board. Begin the test with minimum values of input and supply voltage
Note:
After everything is connected, switch on the power to the board, and check the socket at each pin
without the DUT, for correct voltage / signal at respective pin. Once this is done, plug in the DUT and
check for the correct signal.
TEST RESULTS
Figure 7 shows input (yellow waveform) and output (blue waveform) waveforms for a PA12 power ampli
‐
fier connected to a resistive load. The part was tested for an input voltage of 3V p
‐
p, at 10 kHz frequency. The
supply voltage is set at 90 V p
‐
p. At a gain of 21, an output voltage of 63 V p
‐
p can be observed (blue wave
‐
form). Figure 8 shows the output load current for the PA12 power amplifier. A resistive load of 8
Ω
was con
‐
nected to the output of the amplifier. In figure 8, the output waveform (blue waveform) represents the
output current of 6 Amps p
‐
p.
Figure 7: Voltage Waveforms for PA12
