Electrical Engineering ⇒ Topic : Output Characteristics
The curve between the collector current (IC) and collector-base voltage (VCB) at constant emitter current (IE) gives the output characteristic. The collector current is taken along the Y-axis and the collector-base voltage magnitude is taken along the X-axis. Figure (a) shows the output characteristics of a typical transistor in common base configuration.
Figure (a) CB output characteristics.
The following important conclusions can be drawn from the output characteristics:
The collector-base region is reverse biased in the active region. There is a limit on the maximum value for this reverse-bias voltage for every transistor. Figure (B) shows that the collector-base junction is reverse-biased. This reverse bias voltage must be within the maximum safe limits specified by the manufacturer. If this reverse bias voltage exceeds this limit, transistor breakdown occurs. This breakdown condition has been shown in Figure (B) This effect is known as punch-through effect.
Figure (B) Maximum collector-base voltage rating in CB configuration.
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