Don't agree. The minimal heat sink size for a linear output stage is commanded by the application power dissipation and the acceptable heat sink overtemperature.BJT will need a heat-sink but MOS may not..Consider a MOS Transistor that will operate in Linear region.
No ,I want linear not switch on/off. This is a constant power load If the voltage increased the current decreased and vice versa as attached. the current is ranging from 0-4amp and voltage from0-30v. I need BJT that can handle high-power with small heat sink
Maximal power Vsupply²/(4R) reduces to 33 W, smaller heat sink but still not small.What if the supply is30v ,will it need larg heatsink?
For a fixed load of 6.8 Ohms..(that's what the OP wrote)Just a question....how is the attached circuit able to be constant power? I see only constant current.
Hi,
For a fixed load of 6.8 Ohms..(that's what the OP wrote)
* constant current will give constant power
* constant voltage will give constant power
Usually a constant current circuit uses a shunt resistor to regulate the current. Here we just have one resistor ... the load.
So you may call it
* constant current
* constant voltage
* constant power circuit
Klaus
Hi,
Change the input voltage ... the load voltage and current will be kept constant.
Klaus
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