Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent HP AN 1246 Application Note
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>> Download HP AN 1246 Application Note documenatation <<Text preview - extract from the document 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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