Hi Guyz,
I need design help on a switching circuit. Its going to switch 4V, 250 mA load.
I am considering NPN TIP122 as switch.TIP122 will be controlled through 89c2051.
I have a doubt regarding feasibility of sourcing TIP from 8051 pin. According to my understanding of datasheet it can sink 20mA of current, sourcing should be much lesser I guess. But in this application I need to source current to base of TIP.
So I think I can not directly connect base to port pin... or I am wrong?
I work more on SW, so if this seems a stupid question please ignore.
Cheers
dashy
I need design help on a switching circuit. Its going to switch 4V, 250 mA load.
I am considering NPN TIP122 as switch.TIP122 will be controlled through 89c2051.
I have a doubt regarding feasibility of sourcing TIP from 8051 pin. According to my understanding of datasheet it can sink 20mA of current, sourcing should be much lesser I guess. But in this application I need to source current to base of TIP.
So I think I can not directly connect base to port pin... or I am wrong?
I work more on SW, so if this seems a stupid question please ignore.
Cheers
dashy