In this last (long) weekend, not having handy any Darlington transistor I implemented this pair with discretes to PWM control a current up to 720 mA.
Having found the TIP41 hot to touch I recalled the necessity to facilitate the discharge of the internal capacity to reduce the rising time of the edge measured at the TIP's collector. Not sure of how to calculate that, I went by experimenting with progressively lower values.
From an initial rising time of 20 usec I came down to 3,1usec. Not bad.
Comments anyone?
Having found the TIP41 hot to touch I recalled the necessity to facilitate the discharge of the internal capacity to reduce the rising time of the edge measured at the TIP's collector. Not sure of how to calculate that, I went by experimenting with progressively lower values.
From an initial rising time of 20 usec I came down to 3,1usec. Not bad.
Comments anyone?
Attachments
-
12 KB Views: 20