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參數(shù)資料
| 型號(hào)： | IR3622MPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| 中文描述： | 高頻2相，單或雙輸出同步降壓控制器，輸出跟蹤和排序 |
| 文件頁數(shù)： | 21/31頁 |
| 文件大?。?/td> | 668K |
| 代理商： | IR3622MPBF |
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IR3622MPbF
www.irf.com
Feedback Compensation
The IR3622 is a voltage mode controller; the
control loop is a single voltage feedback path
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
necessary. The goal of the compensation
network is to provide a closed loop transfer
function with the highest 0dB crossing frequency
and adequate phase margin (greater than 45
o
).
The output LC filter introduces a double pole, –
40dB/decade gain slope above its corner
resonant frequency, and a total phase lag of 180
o
(see figure 19). The resonant frequency of the LC
filter expressed as follows:
Figure 19 shows gain and phase of the LC filter.
Since we already have 180
o
phase shift just from
the output filter, the system risks being unstable.
The IR3622’s error amplifier is a differential-input
transconductance amplifier. The output is
available for DC gain control and AC phase
compensation.
The E/A can be compensated either in type II or
type III compensation. When it is used in type II
compensation the transconductance properties of
the E/A become evident and can be used to
cancel one of the output filter poles. This will be
accomplished with a series RC circuit from Comp
pin to ground as shown in figure 20.
This method requires that the output capacitor
has enough ESR to satisfy stability requirements.
In general the output capacitor’s ESR generates
a zero typically at 5kHz to 50kHz which is
essential for an acceptable phase margin. The
ESR zero of the output capacitor expressed as
follows:
-(14)
-
C
L
2
1
F
o
o
LC
=
π
Gain
F
LC
0dB
Phase
0
F
LC
-180
Frequency
Frequency
-40dB/decade
Fig. 19: Gain and Phase of LC filter
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
E/A’s transconductance gain.
First select the desired zero-crossover frequency
(Fo):
F
and
F
F
≤
>
Use the following equation to calculate R
4
:
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
g
m
= Error Amplifier Transconductance
-(15)
-
C
ESR
2
1
F
o
ESR
*
*
π
=
Ve
V
OUT
V
REF
R
5
R
6
R
4
C
9
E/A
F
Z
H(s) dB
Frequency
Gain(dB)
Fb
Comp
C
POLE
Fig. 20: TypeII compensation network
and its asymptotic gain plot
-(16)
-
sC
C
4
sR
1
R
R
R
+
g
s
H
9
9
6
5
5
m
+
=
*
*
)
(
( )
s
[
]
-(18)
-
C
R
2
1
F
-(17)
-
R
*
R
R
R
+
g
H
9
4
z
4
6
5
5
m
*
*
*
π
=
=
21
(
)
s
o
ESR
o
F
1/10
~
1/5
*
-(19)
-
g
R
F
V
R
R
*
F
F
V
R
m
5
2
LC
in
6
5
ESR
*
o
*
osc
4
)
(
*
*
+
=
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| IR3622MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ 2-PHASE Single or Dual SYNCH 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 |
| IR3623MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ 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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| IR3623MPBF_1 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3623MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ 2-PHASE Single or Dual SYNCH 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 |
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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