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| 型號(hào)： | IR3622AMTRPbF |
| 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(yè)數(shù)： | 4/33頁(yè) |
| 文件大?。?/td> | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
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, IR3622A 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 IR3622A 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 C1 are chosen so that
the time constant of R
1 and C1 equals the time
constant of the inductor which is the inductance
L
1 over the inductor’s DCR (RL1). If the two time
constants match, the voltage across C
1
is
proportional to the current through L
1, and
Fig. 6: Loss Less inductor current sensing
and current sharing
L1
RL1
R1
L2
RL2
R2
C2
VP2
FB2
C1
VOUT
Master Phase
Slave Phase
Q2
Q3
Q4
+ VC1(s) -
+
VL1 (s) -
Vin
IL1
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 IR3622A 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 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
V
s
V
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
s
V
1
out
in
1
C
+
=
*
)
(
)
(
)
4
(
-
C
sR
1
sL
R
I
s
V
1
L
1
L
1
C
*
)
(
+
=
1
L
1
L
C
1
L
1
R
I
s
V
R
L
C
R
If
*
)
(
*
:
≈
=
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參數(shù)描述 |
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| IR3622MPBF | 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(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) |
| 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(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) |
| 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 |
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