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參數(shù)資料
| 型號(hào)： | IR3629A |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| 中文描述： | 高頻同步PWM降壓控制器與電源良好輸出 |
| 文件頁(yè)數(shù)： | 8/23頁(yè) |
| 文件大?。?/td> | 598K |
| 代理商： | IR3629A |
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IR3629/IR3629A MPbF
11/26/2007
Based on the frequency of the zero generated by
the output capacitor and its ESR versus
crossover frequency, the compensation type can
be different. The table below shows the
compensation
types
and
location
of
the
crossover frequency.
The following design rules will give a crossover
frequency
approximately
one-tenth
of
the
switching frequency. The higher the band width,
the potentially faster the load transient response.
The DC gain will be large enough to provide high
DC-regulation accuracy (typically -5dB to -12dB).
The phase margin should be greater than 45o for
overall stability.
Desired Phase Margin:
Ceramic
F
LC<Fo<Fs/2<FESR
TypeIII(PID)
Method B
Tantalum,
ceramic
F
LC<Fo<FESR<Fs/2
TypeIII(PID)
Method A
Electrolytic
, Tantalum
F
LC<FESR<Fo<Fs/2
TypII(PI)
Output
capacitor
F
ESR vs. Fo
Compensator
type
3
π
=
Θ
max
Table1- The compensation type and location
of F
ESR versus Fo
The details of these compensation types are
discussed in application note AN-1043 which can
be downloaded from IR’s website at www.irf.com.
For this design we have:
V
in=12V
V
o=0.9V
V
osc=1.25V
V
ref=0.6V
g
m=1000umoh
L
o=0.56uH
C
o=5x22uF, ESR=2mOhm
Note: Use 15uF instead of 22uF for calculation,
this is due to derating of ceramic capacitor
F
s=600kHz
These result to:
F
LC=24.6kHz
F
ESR=1MHz
F
s/2=300kHz
Select crossover frequency:
Fo=60kHz
Since: F
LC<Fo<Fs/2<FESR, typeIII method B is
selected to place the pole and zeros.
(
)
s
o
ESR
o
F
1/10
~
1/5
F
and
F
*
≤
<
16
K
4
.
27
R
:
Select
,
K
47
.
27
R
;
R
*
V
R
K
20
.
42
R
:
Select
,
K
76
.
41
R
;
R
F
*
C
*
π
2
1
R
K
24
.
3
R
:
Select
,
K
23
.
3
R
;
F
*
C
*
π
2
1
R
:
R
and
R
,
R
Calculate
nF
22
.
0
C
:
Select
,
nF
22
.
0
C
;
V
*
R
28
.
1
*
V
*
C
*
L
*
F
*
π
2
C
pF
12
C
:
Select
,
pF
8
.
65
C
;
R
*
F
*
π
2
1
C
2.2nF
C
:
Select
1.98nF,
C
;
R
*
F
*
π
2
1
C
:
C
and
C
,
C
Calculate
10K
R
:
Select
;
2K
R
;
g
2
R
F
*
0.5
F
and
F
*
5
.
0
F
:
Select
kHz
224
F
Θ
Sin
1
Θ
Sin
1
*
F
kHz
16
F
Θ
Sin
1
Θ
Sin
1
*
F
9
8
ref
o
ref
9
8
10
2
Z
7
8
10
2
P
7
10
9
8
10
7
in
3
osc
o
7
3
P
3
4
3
Z1
4
7
3
4
3
m
3
s
P3
2
Z
Z1
2
P
o
2
P
2
Z
o
2
Z
=
+
=
+
=
≥
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