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34716 数据表(PDF) 21 Page - Freescale Semiconductor, Inc

部件名 34716
功能描述  1.0 MHz Dual Switch-Mode DDR Power Supply
PDF  25 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

34716 数据表(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
C
1
*
2
1
π
=
F
F
Z
C
R
F
*
2
1
1
π
=
S
Z
C
R
F
1
2
*
2
1
π
=
2
1
2
1
Z
Z
OX
X
LC
F
F
C
L
F
=
=
=
π
1
*
2
1
Z
F
F
F
C
R
π
=
2
1
*
2
1
Z
S
F
R
C
π
=
S
S
P
C
R
F
*
2
1
1
π
=
S
P
S
C
F
R
1
*
2
1
π
=
1
*
*
2
1
P
X
ESR
F
ESR
Co
F
=
=
π
x
F
F
F
P
CROSS
C
C
Cx
C
R
F
F
+
=
=
*
2
1
2
π
1
*
2
2 −
=
P
F
F
F
X
F
C
R
C
C
π



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