參數(shù)資料
型號： 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)： 12/31頁
文件大小： 668K
代理商： IR3622MPBF
IR3622MPbF
www.irf.com
12
Current Share Mode
This feature allows to connect both outputs
together to increase current handling capability of
the converter to support a common load. In the
current sharing mode, error amplifier 1 becomes
the master which regulates the common output
voltage and the error amplifier 2 performs the
current sharing function, figure 6 shows the
configuration of error amplifier 2.
In this mode, IR3622 makes sure the master
channel starts first followed by slave channel to
prevent any glitch during start up. This is done by
clamping the output of slave’s error amplifier until
the master channel generates the first PWM
signal.
At no load condition the slave channel may be
kept off depending on the offset of the error
amplifier.
Lossless Inductor Current Sensing
The IR3622 uses a lossless current sensing for
current share purposes. The inductor current is
sensed by connecting a series resistor and a
capacitor network in parallel with the inductor
and by measuring the voltage across the
capacitor. The measured voltage is proportional
to the inductor current. This is shown figure 6.
The voltage across the inductor’s DCR can be
expressed by:
The voltage across the C
1
can expressed by:
Combining equations (1),(2) and (3) result in the
following expression for V
C1
:
Usually the resistor R
1
and C
1
are chosen so that
the time constant of R
1
and C
1
equals the time
constant of the inductor which is the inductance
L
1
over the inductor’s DCR (R
L1
). If the two time
constants match, the voltage across C
1
proportional to the current through L
1
, and
is
Fig. 6: Loss Less inductor current sensing
and current sharing
L1
R
L1
R1
L2
R
L2
R2
C2
VP2
FB2
C1
V
OUT
Master Phase
IL1
Slave Phase
Q2
Q3
Q4
+ V
C1
(s)
-
+ V
L1
(s) -
V
in
V
in
the sense circuit can be treated as if only a
sense resistor with the value R
L1
was used.
The mismatch of the time constant does not
affect the measurements of inductor DC current,
but affects the AC component of the inductor
current.
Soft-Start
The IR3622 has programmable soft-start to
control the output voltage rise and limit the inrush
current during start-up. It provides a separate
soft-start function for each output. This will
enable to sequence the outputs by controlling the
rise time of each output through selection of
different value soft-start capacitors.
To ensure correct start-up, the soft-start
sequence initiates when the Vcc, VcH1, VcH2
and Enable rise above their threshold and
generate the Power On Reset (POR) signal.
Soft-start function operates by sourcing an
internal current to charge an external capacitor to
about 3V. Initially, the soft-start function clamps
the error amplifier’s output of the PWM
converter.
)
1
(
-
-
-
sL
R
R
V
V
(
s
V
1
1
L
1
L
out
in
1
RL
+
=
*
)
)
(
)
2
(
-
-
-
R
I
s
V
1
L
1
L
1
RL
*
)
(
=
)
3
(
-
-
-
sC
1
R
sC
1
V
V
(
s
V
1
1
1
out
in
1
C
+
=
*
)
)
(
)
4
(
-
-
-
C
sR
1
sL
*
R
+
I
s
V
1
1
1
1
L
1
L
1
C
*
)
(
+
=
1
L
1
L
C
1
L
1
1
1
R
I
s
V
R
L
C
R
If
*
)
(
*
:
≈
=
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相關代理商/技術參數(shù)
參數(shù)描述
IR3622MTRPBF 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格: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:- 標準包裝: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 開關頻率:1 MHz 工作溫度范圍: 安裝風格: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:- 標準包裝: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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