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| 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)： | 7/23頁(yè) |
| 文件大小： | 598K |
| 代理商： | IR3629A |
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IR3629/IR3629A MPbF
11/26/2007
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 the switching
frequency which results in the capacitor C
POLE:
For a general solution for unconditional stability
for any type of output capacitors, in a wide range
of ESR values we should implement local
feedback with a compensation network (type III).
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, the transconductance amplifier has a
high
impedance
(current
source)
output,
therefore, consideration 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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| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| IR3629MTRPBF | 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(kāi)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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