April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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137Non-isolated Circuits
considerations of Q and negative input impedance are the same as we saw with the buck
con
verter. The RMS input capacitor current is shown below:
II
RMS
OUT
1/2
(DC/( DC))1
5.5 Step Up/Step Down (Buck/Boost) Designs
Figure 5.8 shows an implementation of a step up/step down design based on the MAX641
buck/boost converter.
The MAX641 is intended as a step-up regulating converter for fi xed output use. It lends
itself to the buck/boost design because it has complementary drive pins. The L
X
pin
is driven from an internal MOSFET and the Ext pin is intended to drive an external
MOSFET switch in higher ...
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