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For a transistor, the safe operating area (SOA) is a plot of
For reliable operation the collector current & voltage must remain within the SOA curves.
The forward safe operating area (FSOA) pertains to the operation when
The FSOA is for forward biased operations. The FSOA is plotted for AC as well as DC for different duty cycles. Hence, option (b) is the most appropriate choice.
The SOAs are plotted always on a _________ scale
The scale is always logarithmic, irrespective of the type of device.
As the FSOA increases, the pulse width
On reduced pulse width values, the devices can operated on higher voltages & currents.
The SOAs provided by the manufacturers are for
The manufacturer specifies the SOAs only for single pulse DC operation & a particular temperature (usually 20Degree Centigrade Scale). For actual operations, The SOA’s have to be modified using the thermal impedance charts.
A device is operating at Ic = 4A & Vce = 50V. For the device to operate at Ic = 20A (Without damaging),
For safe operation, the values should be within the limits. P = V.I – with increase in one of the values, another value should decrease.
For a BJT, find the maximum power dissipation when the device is safely operated at Vce = 90V and Ic = 0.5A
The SOA for a MOSFET is plotted for
It is a plot of drain current vs drain to source voltage.
The SOA for an IGBT is plotted for
It is a plot of collector current vs collector to emitter voltage.
For MOSFET’s SOA, as the pulse width goes on increasing, the maximum voltage rating ____ & current rating ____
Refer MOSFET’s SOA.