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How this circuit works

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ku637

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Hello ,

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?

bjt.JPG

Sorry there has been a mistake .. both the supplies are 24V only no 48V in the system..forgive the mistake in figure..
 
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    ku637

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Is this a darlington pair arrangement?
Click to expand...
Yes.
R2 15k confuses me..
Click to expand...
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.
 
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Thank you for the input.. what can be the purpose of 47Ohms any suggestion? is it to limit the output drive current?
 

ku637 said:
Thank you for the input.. what can be the purpose of 47Ohms any suggestion? is it to limit the output drive current?
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Yes. Probably the only purpose.
 
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