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Pulsed Characterization of
Power Semiconductors
Using Electronic Loads

Application Note 1246 Electronic Load Improves
Power Semiconductor
Measurements

An electronic load eliminates the
self-heating problems associated Electronic Loads
with measuring the on-state
voltage drop and trans- An electronic load (see figure) employs a power MOSFET as an
conductance (or current gain) of electronically variable load that dissipates power. The electronic
power semiconductors. load senses MOSFET current (IIN), then amplifies it, compares it
with a reference, and feeds back the output of an error amplifier to
On-state voltage drop and the MOSFET gate. This forms a closed-loop current control system.
transconductance (or current Therefore, the electronic load's input current (IIN) is proportional to
gain) of power FETs, BJTs, and the control reference input. Input current, IIN, loads the DC power
IGBTs are temperature dependent, source (battery or power supply).
but are typically specified at 25