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ADP2443ACPZN-R7 Datasheet(PDF) 19 Page - Analog Devices

No. de pieza ADP2443ACPZN-R7
Descripción Electrónicos  Process control and industrial automation
PDF  25 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

ADP2443ACPZN-R7 Datasheet(HTML) 19 Page - Analog Devices

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ADP2443
Data Sheet
Rev. 0 | Page 18 of 24
The control to output transfer function is based on the following
equations:
P
Z
VI
COMP
OUT
VD
f
s
f
s
R
A
s
V
s
V
s
G
π
2
1
π
2
1
)
(
)
(
)
(
where:
AVI = 10 A/V.
R is the load resistance.
OUT
ESR
Z
C
R
f
π
2
1
where:
RESR is the ESR of the output capacitor.
COUT is the output capacitance.
OUT
ESR
P
C
R
R
f
)
(
π
2
1
The ADP2443 uses a transconductance amplifier for the error
amplifier and to compensate the system. Figure 38 shows the
simplified, peak current mode control, small signal circuit.
VOUT
VOUT
R
RTOP
RBOT
RC
CC
CCP
VCOMP
AVI
COUT
RESR
gm
Figure 38. Simplified Peak Current Mode Control, Small Signal Circuit
The compensation components, RC and CC, contribute a zero,
and the optional CCP and RC contribute an optional pole.
The closed-loop transfer equation is as follows:
CP
C
m
TOP
BOT
BOT
V
C
C
g
R
R
R
s
T
)
(
1
()
(1
)
CC
VD
CCCP
CCP
RC
s
Gs
RC
C
ss
CC



The following design guideline shows how to select the RC, CC,
and CCP compensation components for ceramic output
capacitor applications:
1.
Determine the cross frequency, fC. Generally, fC is between
fSW/12 and fSW/6.
2.
Calculate RC using the following equation:
VI
m
C
OUT
OUT
C
A
g
f
C
V
R
V
6
.
0
2
3.
Place the compensation zero at the domain pole, fP; then
determine CC using the following equation:
C
OUT
ESR
C
R
C
R
R
C
)
(
4.
CCP is optional. It can be used to cancel the zero caused by
the ESR of the output capacitor.
C
OUT
ESR
CP
R
C
R
C
ADIsimPOWER DESIGN TOOL
The ADP2443 is supported by the ADIsimPower™ design tool
set. ADIsimPower is a collection of tools that produce complete
power designs that are optimized for a specific design goal. The
tools enable the user to generate a full schematic and bill of
materials and calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and component
count, while taking into consideration the operating conditions
and limitations of the IC and all real external components. For
more information about the ADIsimPower design tools, refer to
www.analog.com/ADIsimPower. The tool set is available from
this website, and users can request an unpopulated board.



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