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| 型號(hào)： | IR3623MPBF |
| 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)： | 11/26頁(yè) |
| 文件大小： | 523K |
| 代理商： | IR3623MPBF |
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IR3623MPbF
www.irf.com
11
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
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 amplifiers.
In this mode IR3623 make 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 depends on the offset of error amplifier.
Lossless Inductor Current Sensing
The IR3623 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 inductor and
measuring the voltage across the capacitor, this
voltage is proportional to the inductor current. As
shown in 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 to 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 IR3623 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 outputs. This will
enable to sequence the outputs by controlling the
rise time of each outputs through selection of
different value soft-start capacitors.
To ensure correct start-up, the soft-start
sequence initiates when the Vcc, Enable and
5V_sns 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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(kāi)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(kāi)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(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(pán) 包裝:帶卷 (TR) |
| IR3624MTRPBF | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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(kāi)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 |
| IR3628MPBF | 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) |
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