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参数资料
| 型号： | IR3628MPBF |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高频同步PWM降压控制器 |
| 文件页数： | 8/22页 |
| 文件大小： | 581K |
| 代理商： | IR3628MPBF |
IR3628MPbF
08/10/2007
Based on the frequency of the zero generated by
output capacitor and its ESR versus crossover
frequency, the compensation type can be
different.
The
table
below
shows
the
compensation types and location of 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
Ω
=
Ω
=
=
Ω
=
Ω
=
=
Ω
=
Ω
=
Ω
=
Ω
≥
=
Θ
Θ
+
=
Θ
+
Θ
=
K
R
V
R
K
R
F
C
R
K
F
C
R
Calculate
nF
V
R
V
C
L
F
C
pF
R
F
R
F
Select
kHz
F
Sin
F
kHz
F
Sin
F
ref
o
ref
Z
P
in
osc
o
P
Z
P
o
P
Z
o
Z
50
84
40
84
20
42
76
41
2
1
24
3
23
3
2
1
22
0
22
0
28
1
2
12
8
65
2
1
5
0
224
1
16
1
8
9
10
2
7
8
2
7
10
3
7
3
2
.
R
:
Select
,
.
R
;
*
.
R
:
Select
,
.
R
;
*
.
R
:
Select
,
.
R
;
*
:
R
and
R
,
R
.
C
:
Select
,
.
C
;
*
.
*
C
:
Select
,
.
C
;
*
C
2.2nF
C
:
Select
2.46nF,
C
;
*
F
*
2
1
C
:
C
and
C
,
C
Calculate
8.06K
R
:
Select
;
2K
R
;
g
2
R
F
*
0.5
F
and
*
.
F
:
*
9
8
10
9
8
10
7
3
4
3
Z1
4
7
3
4
3
m
3
s
P3
Z1
π
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 Web-Site.
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=0.36uH
C
o=6x22uF, ESR=2mOhm
Note: Use 16.5uF instead of 22uF for calculation,
this is due to derating of ceramic capacitor
F
s=600kHz
These result to:
F
LC=26.6kHz
F
ESR=4.8MHz
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
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相关代理商/技术参数 |
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| IR3629 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629A | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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