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                                            Agilent AN 1246
                                            Pulsed Characterization of Power
                                            Semiconductors Using Electronic Loads
                                            Application Note




Electronic Load Improves Power
                                             Electronic Loads
Semiconductor Measurements
An electronic load eliminates the self-      An electronic load (see figure) employs a power MOSFET as an electronically variable load that dis-
heating problems associated with             sipates power. The electronic load senses MOSFET current (Iin), then amplifies it, compares it with
measuring the on-state voltage drop          a reference, and feeds back the output of an error amplifier to the MOSFET gate. This forms a
and transconductance (or current             closed-loop current control system. Therefore, the electronic load's input current (IIN) is propor-
gain) of power semiconductors.               tional to the control reference input. Input current, IIN, loads the DC power source (battery or power
                                             supply).
On-state voltage drop and transcon-
ductance (or current gain) of power          Given a fixed control reference, the load acts as a series current regulator. If the control reference
FETs, BJTs, and IGBTs are tempera-           is proportional to the load input voltage (VIN), the load behaves like a high quality power resistor.
                                             Some load manufacturers also offer a constant voltage regulation mode in which the load
ture dependent, but are typically
                                             behaves like a power zener diode.
specified at 25 

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