April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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11An Introduction to the Linear Regulator
the controller and series-pass transistor is drawn from the headroom voltage (the input-to-
output dif
ference) or is provided by an auxiliary isolated power supply.
The power transistor still needs to have a breakdown voltage rating greater than the input
voltage, since at start-up it must see the entire input voltage across it. Other methods such
as a bootstrap Zener diode can also be used in order to shunt the voltage around the pass
transistor, but only when the input voltage itself is switched on and off to activate the
power supply. Also, caution must be taken to ensure that any ...
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