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LTC3538 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3538
Description  800mA Synchronous Buck-Boost DC/DC Converter
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3538 Datasheet(HTML) 13 Page - Linear Technology

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LTC3538
13
3538fb
VOUT
R1
1V
FB
CP2
CP1
RZ
VC
R2
CZ1
3538 F05
–
+
1
2
Figure 5. Error Amplifier with Type III Compensation
OPERATION
Most applications demand an improved transient response
to allow a smaller output filter capacitor. To achieve a higher
bandwidth, Type III compensation is required, providing
two zeros to compensate for the double-pole response of
the output filter. Referring to Figure 5, the location of the
poles and zeros are given by:
ƒPOLE1 ≅
1
2• π • 32e
3 •R1•C
P1
Hz
(which is extremly close to DC)
ƒZERO1 =
1
2• π •RZ •CP1
Hz
ƒZERO2 =
1
2• π •R1•CZ1
Hz
ƒPOLE2 =
1
2• π •RZ •CP2
Hz
where resistance is in Ohms and capacitance is in
Farads.



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