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參數(shù)資料
| 型號(hào)： | IR3638SPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS |
| 中文描述： | 高頻同步PWM降壓控制器進(jìn)行跟蹤APPLIACTIONS |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 300K |
| 代理商： | IR3638SPBF |
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IR3638SP
b
F
3/19/07
The ESR zero of the output capacitor expressed
as follows:
1
F
ESR
*
π
V
OUT
The transfer function (Ve/Vo) is given by:
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
The gain is determined by the voltage divider and
error amplifier’s transconductance gain.
First select the desired zero-crossover frequency
(Fo):
F
and
F
F
≤
>
Use the following equation to calculate R3:
Where:
V
in
= Maximum Input Voltage
V
osc
= Oscillator Ramp Voltage
F
o
= Crossover Frequency
F
ESR
= Zero Frequency of the Output Capacitor
F
LC
= Resonant Frequency of the Output Filter
R
1
and R
2
= Feedback Resistor Dividers
g
m
= Error Amplifier Transconductance
(9)
-
C
ESR
2
o
*
=
Fig. 11: TypeII compensation network
and its asymptotic gain plot
(10)
-
sC
C
3
sR
1
R
R
R
+
g
s
H
4
4
8
9
9
m
+
=
*
*
)
(
( )
s
[
]
(12)
-
C
R
2
1
F
(11)
-
R
*
R
R
R
+
g
H
4
3
z
3
8
9
9
m
*
*
*
π
=
=
12
(
)
s
o
ESR
o
F
1/10
~
1/5
*
(13)
-
g
R
F
V
R
R
*
F
F
V
R
m
2
2
LC
in
2
1
ESR
*
o
*
osc
3
)
(
*
*
+
=
Ve
V
REF
R
2
R
1
R
3
C
4
E/A
F
Z
H(s) dB
Frequency
Gain(dB)
Fb
Comp
C
POLE
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
:
(14)
-
C
L
2
1
75
.
0
F
F
75
F
o
o
z
LC
z
*
*
%
π
=
=
C
C
C
C
R
2
1
F
POLE
4
POLE
4
3
P
+
=
*
*
*
π
2
F
F
For
(15)
-
F
R
*
1
C
1
F
R
1
C
s
P
s
3
4
s
3
POLE
<<
=
*
*
*
π
π
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
compensation types and location of crossover
frequency.
below
shows
the
Compensator
type
F
ESR
vs. F
o
Output
capacitor
TypII(PI)
F
LC
<F
ESR
<F
o
<F
s/2
Electrolytic
, Tantalum
TypeIII(PID)
Method A
F
LC
<F
o
<F
ESR
<F
s/2
Tantalum,
ceramic
TypeIII(PID)
Method B
F
LC
<F
o
<F
s/2
<F
ESR
Ceramic
Table1- The compensation type and location
of F
ESR
versus F
o
The details of these compensation types are
discussed in application note AN-1043 which can
be downloaded from IR Web-Site.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3638STRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 400kHz 0.6V Track 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 |
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3640MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3651 | 制造商:IRF 制造商全稱:International Rectifier 功能描述: |
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