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參數(shù)資料
| 型號(hào)： | IR3628MPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高頻同步PWM降壓控制器 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 581K |
| 代理商： | IR3628MPBF |
IR3628MPbF
08/10/2007
To cancel one of the LC filter poles, place the
zero before the LC filter resonant frequency pole:
Using equations (15) and (16) to calculate C9.
One more capacitor is sometimes added in
parallel with C4 and R3. This introduces one
more pole which is mainly used to suppress the
switching noise.
The additional pole is given by:
The pole sets to one half of switching frequency
which results in the capacitor C
POLE:
For a general solution for unconditionally stability
for any type of output capacitors, in a wide range
of ESR values we should implement local
feedback with a compensation network (typeIII).
The typically used compensation network for
voltage-mode controller is shown in figure 15.
In such configuration, the transfer function is
given by:
The error amplifier gain is independent of the
transconductance under the following condition:
By replacing Z
in and Zf according to figure 15, the
transfer function can be expressed as:
(16)
-
C
L
2
1
75
0
F
75
F
o
z
LC
z
*
.
%
π
=
As known, transconductance amplifier has high
impedance (current source) output, therefore,
consider should be taken when loading the error
amplifier output. It may exceed its source/sink
output current capability, so that the amplifier will
not be able to swing its output voltage over the
necessary range.
The compensation network has three poles and
two zeros and they are expressed as follows:
Cross over frequency is expressed as:
C
R
2
1
F
POLE
4
POLE
4
3
P
+
=
*
π
s
POLE
F
C
F
R
C
*
R
*
1
*
3
π
=
4
3
1
Fig.15: Compensation network with local
feedback and its asymptotic gain plot
IN
m
f
m
o
e
Z
g
1
Z
g
1
V
+
=
(
)
[]
)
(
*
)
(
*
)
(
)
(
7
10
3
4
3
4
3
10
8
7
4
3
4
8
C
sR
1
C
sR
1
R
sC
1
C
sR
1
C
sR
1
s
H
+
+
=
8
7
10
8
7
2
z
4
3
1
z
3
4
3
4
3
P
7
10
2
P
1
P
R
C
2
1
R
C
2
1
F
C
R
2
1
F
C
R
2
1
C
R
2
1
F
C
R
2
1
F
0
F
*
)
(
*
π
+
=
+
=
o
osc
in
7
3
o
C
L
2
1
V
C
R
F
*
π
=
(17)
-
1
Z
*
g
and
1
Z
*
g
in
m
f
m
>>
VOUT
VREF
R9
R8
R10
C7
C3
C4
R3
Ve
FZ1
FZ2
FP2
FP3
E/A
Zf
ZIN
Frequency
Gain(dB)
H(s) dB
Fb
Comp
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3628MTRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3629 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629A | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMPBF | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMTRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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