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34717 датащи(PDF) 20 Page - Freescale Semiconductor, Inc

номер детали 34717
подробное описание детали  5.0 A 1.0 MHz Fully Integrated Dual Switch-Mode Dual Switch-Mode 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

34717 датащи(HTML) 20 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
20
Freescale Semiconductor
34717
TYPICAL APPLICATIONS
OPERATIONAL MODES
Figure 9. Type III compensation network
1. Choose a value for R1
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 are 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 Crossover Frequency achieves a
faster response and a proper phase margin
TRACKING CONFIGURATIONS.
This device allows two tracking configurations: Ratiometric
and Co-incidental Tracking.
Figure 10. Ratiometric Tracking
Figure 11. Co-incidental Tracking
RATIOMETRIC TRACKING CIRCUIT
CONFIGURATION
The master voltage feedback resistor divider network is
used in place of R3 and R4 as shown in Figure 12. The slave
output is connected through its own feedback resistor divider
network to the INV- terminal, resistors R1 and R2. All four
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
X
X
LC
F
F
Co
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
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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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