June 2006
Intermediate to advanced
528 pages
17h 12m
English
Content preview from Switching Power Supplies A - Z
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Chapter 7
combination of R, L and C. So
Z
out_withoutfeedback
= R||
1
Cs
||L =
sL
1 + s
L
R
+ s
2
LC
where R is the load resistance, and L
is the actual inductance L for a buck, but is L/(1 − D)
2
for a boost and a buck-boost. We have taken the three components in parallel as indicated by
the symbol “||.”
With feedback considered, the output impedance now decreases as follows:
Z
out_withfeedback
=
1
1 + T
× Z
out_withoutfeedback
Even without a detailed analysis (using Laplace transform), this should tell us by how much
the output voltage will eventually shift (settle down to), if we change the load current.
Type 1 and Type 2 Compensations
In Figure 7-18, we have also shown ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.