Hello,
There are two ways to make darlington transistors.
With two NPN transistors:
http://en.wikipedia.org/wiki/Darlington_transistor
Or with a NPN driver and PNP power transistor:
http://en.wikipedia.org/wiki/Sziklai_pair
The second one has less losses by the BE connections.
Bertus
There are two ways to make darlington transistors.
With two NPN transistors:
http://en.wikipedia.org/wiki/Darlington_transistor
Or with a NPN driver and PNP power transistor:
http://en.wikipedia.org/wiki/Sziklai_pair
The second one has less losses by the BE connections.
Bertus