I am designing a flyback driver using a salvaged power transistor that was originally the driver transistor of a flyback in a ctr screen.
This power transistor is the 2SC5681
I want to drive this transistor with an IC, and the high base current required by this transitor (1-2A) cannot be directly supplied by the IC. So i need an intermediate stage to drive the transistor base.
First, i planned to put an npn transistor before the 2SC5681 in a darlington configuration to amplify the current gain.
but when I reviewed the 2SC5681 datasheet, i saw that this transistor needs a positive Ib (which is normal)
AND a some negative current at the base for switch off (fast)
so my question is, can i use the darlington configuration to achieve the base drive despite this negative current? or what kind of simple base driver can i use for this transistor?
I had thought of using a push pull configuration like a mosfet gate drive system but is it adapted?
maxime