What do the terms low side driver and high side driver mean?

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The terms "low side driver" and "high side driver" refer to configurations used in transistor circuits to control loads. A high side driver typically uses a PNP transistor, where the emitter is connected to the positive power rail and the load connects to the negative rail. In contrast, a low side driver employs an NPN transistor, with the load connected to the positive rail and the emitter grounded. The base of the high side driver is pulled down to activate it, while the low side driver is activated by supplying positive current to its base. Understanding these configurations is essential for designing effective electronic circuits.
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What do the terms "low side driver" and "high side driver" mean?

Can anyone give me some information on what low side driver and high side driver mean?
 
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Low-side and high-side is sometimes used when speeking of transformer voltages.
 
Or in the context of transistors driving loads, a high side driver would normally be a PNP transistor, with the emitter connected to the + power rail, collector connected to the load (which then connects to the - power rail), and the base is pulled down to turn on the high-side PNP switch.

A low-side driver is just that upside-down. The load connects to the + power rail, and the NPN collector connects to the load. The emitter is grounded, and the base is driven up (supplied with a positive current) to turn on the NPN transistor.
 

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