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ADP1821ARQZ-R7 Fiches technique(PDF) 23 Page - Analog Devices

No de pièce ADP1821ARQZ-R7
Description  Step-Down DC-to-DC Controller
PDF  24 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADP1821ARQZ-R7 Fiches technique(HTML) 23 Page - Analog Devices

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ADP1821
Rev. B | Page 23 of 24
SUMMARY OF EQUATIONS
The following equations are for the reference and convenience
of the user. Equations are replicated from the Compensating the
Voltage Mode Buck Regulator section.
COMPENSATION EQUATIONS
See the Compensating the Voltage Mode Buck Regulator
section.
10
SW
CO
f
f
=
LC
f
LC
π
2
1
=
OUT
ESR
ESR
C
R
f
π
2
1
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
−
=
ESR
CO
LC
ESR
FILTER
f
f
f
f
A
log
dB
20
log
dB
40
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
=
RAMP
IN
MOD
V
V
A
log
20
ESR
CO
ESR
f
f
×
×
=
10
log
45
ϕ
ESR
B
ϕ
ϕ
−
=150
If
70
≥
ESR
ϕ
, use Type II compensation.
If
70
<
ESR
ϕ
, use Type III compensation.
TYPE II COMPENSATION EQUATIONS
See the Type II Compensator section.
⎟
⎠
⎞
⎜
⎝
⎛
+
=
45
2
tan
B
K
φ
K
f
f
CO
Z =
fP
= fCOK
Select RTOP between 1 k and 10 k; a good starting value is 2 k.
FB
OUT
TOP
FB
BOT
V
V
R
V
R
−
=
ACOMP = 0 dB − AMOD − AFILTER
⎟
⎠
⎞
⎜
⎝
⎛
×
=
20
10
COMP
A
TOP
Z
R
R
Z
Z
I
f
R
C
π
2
1
=
P
Z
HF
f
R
C
π
2
1
=
TYPE III COMPENSATION EQUATIONS
See the Type III Compensator section.
2
45
2
tan
⎟
⎠
⎞
⎜
⎝
⎛
⎟
⎠
⎞
⎜
⎝
⎛
+
=
B
φ
K
K
f
f
CO
Z =
fP
= fCO √K
Select RTOP between 1 k and 10 k. A good starting value is 2 k.
V
V
R
V
R
OUT
TOP
BOT
6
.
0
6
.
0
−
×
=
Z
TOP
FF
f
R
C
π
2
1
=
P
FF
FF
f
C
R
π
2
1
=
FF
CO
FF
FF
R
f
C
Z
+
=
π
2
1
ACOMP = 0 dB − AMOD − AFILTER
()
⎟
⎠
⎞
⎜
⎝
⎛
×
=
20
10
||
COMP
A
FF
TOP
Z
Z
R
R
Z
Z
I
f
R
C
π
2
1
=
P
Z
HF
f
R
C
π
2
1
=



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