Can some one help me understanding how this circuit functions? Basically the emitter terminal of T2 is used as a power supply in an application circuit.(I have shown like 12k ,as current requirement is low)
Is this a darlington pair arrangement? R2 15k confuses me.. Can some one explain how it is working?
Sorry there has been a mistake .. both the supplies are 24V only no 48V in the system..forgive the mistake in figure..
Why, base-emitter pull-down resistor is even built-in with many power darlington transistors, review datasheets. Its purpose is also reduction of leakage current.