Gerhard Fiedler email (remove spam text)
Russell McMahon wrote:
For some examples of such switches:
- http://www.irf.com/product-info/datasheets/data/ips5451.pdf A high side
switch. Look at the "Typical Connection" diagram on the first page: the
load is connected between the switch and ground, and the switch is
therefore on the "high side" of the load.
- http://www.st.com/stonline/products/literature/ds/7374.pdf A low side
switch. Look at Fig. 3 (Unclamped Inductive Load Test Circuit): the load is
connected between the switch and the high voltage rail, and the switch is
therefore on the "low side" of the load.
You also can see some of the differences Russell explained in the internal
circuits of these switches.
A simple switch component (transistor, MOSFET, relay etc) can generally be
used as both high side or low side switch, depending on how you connect it
and/or drive it. It's the additional circuit included in these ICs that
make them specific for either application.
In reply to: <085801c59fbe$61414fc0$d201a8c0@y2k>
See also: www.piclist.com/techref/index.htm?key=high+sidelow+side
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