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34716 датащи(PDF) 21 Page - Freescale Semiconductor, Inc

номер детали 34716
подробное описание детали  1.0 MHz Dual Switch-Mode DDR Power Supply
PDF  25 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34716 датащи(HTML) 21 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
21
34716
TYPICAL APPLICATIONS
Figure 10. Type III compensation network
1. Choose a value for R1 (R2only applies to Channel 1)
2. Consider a Crossover frequency of one tenth of the
switching frequency, set the Zero pole frequency to
Fcross/10
3. Knowing the LC frequency, the Frequency of Zero 1
and Zero 2 in the compensation network is equal to
FLC
This gives the result
4. Calculate RS by placing the first pole at the ESR zero
frequency
5. Equating pole 2 at the Crossover Frequency to achieve
a faster response and a proper phase margin
TRACKING CONFIGURATIONS
The 34716 allows default Ratiometric tracking on channel
2 by connecting VDDQ to the VREFIN terminal. It has an
internal resistor divider that allows an output of VDDQ/2.
F
CROSS
P
C
R
F
F
1
0
*
2
1
10
1
π
=
=
PO
F
F
R
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1
*
2
1
π
=
F
F
Z
C
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F
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2
1
1
π
=
S
Z
C
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1
2
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2
1
π
=
2
1
2
1
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Z
OX
X
LC
F
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L
F
=
=
=
π
1
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2
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=
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2
1
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=
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1
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1
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ESR
F
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=
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x
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+
=
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2
1
2
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1
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2
2 −
=
P
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F
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