HP an 1246 free download

File name an_1246.pdf

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