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Dt Sheet. Therefore, separate measurements must be made on each waveform to determine the total switching time, For this reason, the following new terms have been defined.
An enlarged portion of the inductive switching waveforms is shown in Fig. However, at lower test currents this relationship may not be valid. Safe operating area curves indicate l C -V CE limits of the transistor that must be observed for reliable operation:i. Second breakdown limitations do not derate the voltages shown on Fig.
Under these conditions the collector voltage must be held to a safe level at or below a specific value of collector current. This can be accomplished by several means such as active clamping, RC snubbing, load line shaping, etc.
The safe leve for these devices is specified as Reverse Bias Safe Operating Area and represents the voltage-current conditions during reverse biased turn-off. This rating is verified under clamped conditions so that the device is never subjected to an avalanche mode.
A good example is a circuit where an inductor is inserted between the transistor and the bus, which limits the rate of rise of collector current to a known value. BUX48A Maximum allowable collector-emitter voltage versus collector current is plotted for several pulse widths. Pulse width is defined as the time lag between the fault condition and the removal of base drieve. Storage time of the transistor has been factored into the curve.
This is the same circuit that is used to measure forwardbias safe operating area. Open as PDF.
BUX48 - BUX48 NPN Power Transistor
Transistor BUX48, NPN, TO-3
BUX48 Datasheet, Equivalent, Cross Reference Search