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Power Transistors

NXP's Unbreakable BLF578XR LDMOS Power Transistor

This Section Addresses Using PNP Transistors To Perform High Facet Switching With A Microcontroller

 

Component seven coated employing transistors to change loads that call for greater currents or voltages than the microcontroller can handle.  All the circuits had comparable topologies. The load was connected towards the energy source, and an NPN transistor acted like a switch to floor. Given that the switching aspect (the transistor) was at floor, it's named a “low side swap.”
With reduced aspect switching the load is at Vcc possible.  Sometimes it is actually wanted to get the load at ground potential, and to swap the energy provided to it. This is known as higher aspect switching. Figure 8-1 shows the difference among higher and reduced aspect switching.
You cannot just connect an NPN transistor’s collector to Vcc and the emitter towards the load that is grounded.  As explained within the previous section, damaging feedback will stop the NPN transistor from becoming pushed into saturation.

The alternative would be to utilize a PNP transistor.  Working with PNP transistors is essentially exactly the same as NPN transistors, other than the polarities are reversed.  Figure 8-2 exhibits a circuit employing a PNP transistor as a higher side switch.  Notice that the emitter is connected towards the constructive voltage.  The arrow within the emitter of a PNP transistor points in the reverse course than in an NPN transistor.  Base current flows through the emitter to the base, and collector current flows through the emitter. This is all backwards in comparison with an NPN transistor.
The signal required to control the PNP transistor can also be corrected from NPN transistors.  With the NPN transistor you determine the port pin to the higher state to flip about the transistor.  With the PNP transistor you must convey the port pin lower to flip within the transistor.
                
 
The calculations for base current as well as the base resistor are identical to those outlined in Part seven for NPN transistors except the polarities are reversed.

One extra thing you must be cautious with PNP substantial facet switches may be the voltage applied to drive the load.  Usually it is most effective to use the same voltage to drive the load which is used to power the microcontroller.  Look at the next.
Suppose the load voltage is +12V plus the microcontroller is running at 5 volts.  Ignore R2. R2 would ordinarily have a worth higher enough to own little impact  and ignoring it makes the calculations that comply with easier. Presume that P0 is higher, at 5V, and R1 is 1000 ohms.  Base current could be calculated by

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Frequently Asked Questions...

How can a network of a few transistors can end up into computing power?

I know processors are made of transistors arranged in a certain way but I don't get how they can end up making stuff like 4+7 or 4*3. And also I don't get how they can be given the orders to do these things. Can someone explain me how we get from an interrupter to a thing that can process information?

A schema of a very basic and easy to understand processor would be nice ^^

Thanks


Answer:

Check out this article.

http://www.howstuffworks.com/microprocessor.htm