Power-Measurement Application Examples
2–36
THS710A, THS720A, THS730A & THS720P User Manual
Testing a Switching Transistor Drive Circuit
You need to evaluate the gate-drive circuit for a power FET
(field-effect transistor) in a switching power supply. The gate-drive
timing circuit is referenced to chassis ground. But the gate-drive
signal is transformer-coupled to the FET, which is connected to a
–300 VDC bus. Set up the TekScope instrument to compare the
gate-drive signal at the output of the timing circuit to the signal at
the gate of the FET.
Timing
circuit
Ch 1 Ch 2
–300 VDC bus
P5102
Probe
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