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

  1. Dec 6, 2007 #1
    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?
     
  2. jcsd
  3. Dec 6, 2007 #2

    dlgoff

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    Science Advisor
    Gold Member

    Low-side and high-side is sometimes used when speeking of transformer voltages.
     
  4. Dec 7, 2007 #3

    berkeman

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    Staff: Mentor

    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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