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ADP1823ACPZ-R7 数据表(PDF) 27 Page - Analog Devices

部件名 ADP1823ACPZ-R7
功能描述  Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking
PDF  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP1823ACPZ-R7 数据表(HTML) 27 Page - Analog Devices

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ADP1823
Rev. A | Page 27 of 32
Table 4. Compensation Equations
Equations
Calculations
10
SW
CO
f
f
=
(70)
LC
π
f
LC
2
1
=
(71)
OUT
ESR
ESR
C
R
π
f
2
1
=
(72)
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×
−
=
ESR
CO
LC
ESR
FILTER
f
f
f
f
A
log
dB
20
log
dB
40
(73)
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
=
RAMP
IN
MOD
V
V
A
log
20
(74)
ESR
CO
ESR
f
f
×
×
°
=
ϕ
10
log
45
(75)
ESR
B
ϕ
−
°
=
ϕ
150
(76)
If
, use Type II compensation.
°
≥
ϕ
70
ESR
If
, use Type III compensation.
°
<
ϕ
70
ESR
Type II Compensation
Calculations
⎟
⎠
⎞
⎜
⎝
⎛
°
+
=
45
2
tan
B
φ
K
(77)
K
f
f
CO
Z =
(78)
K
f
f
CO
P =
(79)
Select RTOP between 1 kΩ and 10 kΩ. A good starting value is 2 kΩ.
FB
OUT
TOP
FB
BOT
V
V
R
V
R
−
=
(80)
FILTER
MOD
COMP
A
A
A
−
−
= dB
0
(81)
⎟
⎠
⎞
⎜
⎝
⎛
×
=
20
10
COMP
A
TOP
Z
R
R
(82)
Z
Z
I
f
R
π
C
2
1
=
(83)
P
Z
HF
f
R
π
C
2
1
=
(84)



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