April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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Chapter 7
The technique of current mirroring for source current-sensing purposes involves
connecting a small fraction of the cells in a po
wer MOSFET to a separate sense terminal.
The current in this terminal (see Figure 7.33(a) is a fi xed fraction of the source current
feeding the load. Current sense lead provides an accurate fraction of the drain current that
can be used as a feedback signal for control and/or protection.
It ’ s also valuable if you must squeeze the maximum switching speed from a MOSFET.
For example, you can use the sense terminal to eliminate the effects of source-lead
inductance in high-speed switching ...
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