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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

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