(optional) Install a
terminal block at J34 to more easily change DC load resistors
(optional) Install an
SMA connector at J12 to monitor the output voltage across the output
capacitor (C11) of channel 2 of the TPS7B780x-Q1
Install an appropriate
resistance to provide the desired DC steady-state load at R29 or J34
Install an appropriate
resistance to provide the desired peak transient load at R21. If additional
power dissipation is needed, up to 5 resistors can installed in parallel at
R21 through R25.
(optional) Connect an
oscilloscope current clamp probe to loop IOUT_2 to measure output
current
Connect an oscilloscope probe
between test point TP11 (VOUT2) and TP5 (GND) to measure output voltage.
Connect the
oscilloscope to SMA connector J12 (LDO_OUT2) to measure output
voltage across the output capacitor if desired.
Connect a 5V DC power supply
capable of providing 100mA between J37 (VDD) and J41 (GND) to power the
LMG1020
Connect a trigger source
capable of providing a 3.3V output to J38. TI recommends either a function
generator configured for 0-3.3V square wave output or a DC power supply
configured for 3.3V output.
With the channel 2 output of
the TPS7B780x-Q1 enabled and configured for the
desired output voltage and current limit, applying 3.3V at J38 enables the
transient load, while applying 0V leaves only the DC steady-state load
connected to the output of channel 2.