參數(shù)資料
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)： 12/26頁(yè)
文件大?。?/td> 523K
代理商： IR3623MPBF
IR3623MPbF
www.irf.com
Soft-Start (cont.)
During power up, the converter output starts at
zero and thus the voltage at Fb is about 0V. A
current (64uA) injects into the Fb pin and
generates a voltage about 1.6V (64ux25K)
across the negative input of error amplifier, see
figure 7.
The magnitude of this current is inversely
proportional to the voltage at soft-start pin. The
28uA current source starts to charge up the
external capacitor. In the mean time, the soft-
start voltage ramps up, the current flowing into
Fb pin starts to decrease linearly and so does the
voltage at negative input of error amplifier.
When the soft-start capacitor is around 1V, the
voltage at the negative input of the error amplifier
is approximately 0.8V.
As the soft-start capacitor voltage charges up,
the current flowing into the Fb pin keeps
decreasing.
The feedback voltage increases linearly as the
injecting current goes down. The injecting current
drops to zero when soft-start voltage is around
1.8V and the output voltage goes into steady
state. Figure 8 shows the theoretical operational
waveforms during soft-start.
The output start-up time is the time period when
soft-start capacitor voltage increases from 1V to
2V. The start-up time will be dependent on the
size of the external soft-start capacitor. The start-
up time can be estimated by:
For a given start up time, the soft-start capacitor
(nF) can be estimated as:
For normal start up the
Seq
pin should be pulled
high (usually can be connected to Vout3).
Fig. 7: Soft-Start circuit for IR3623
Fig. 8: Theoretical operation waveforms
during soft-start
)
5
(
-
-
-
V
(
8
0
ms
T
A
20
C
start
SS
)
.
)
(
*
)
(
μ
V
1
V
8
.
1
C
T
μA
28
ss
start
=
12
Soft-Start
Voltage
Voltage at negative input
of Error Amp
Voltage at Fb pin
Current flowing
into Fb pin
64uA
0uA
0V
0.8V
1.6V
0.8V
0V
3V
1.8V
1V
Output of POR
E/A2
VP2
Fb2
SS2/SD2
I
SS2 = 28uA
Track
POR
OCP2
I
hiccup2 = 3uA
64uA
3V
E/A1
VP1
Fb1
SS1/SD1
I
SS1 = 28uA
POR
OCP1
I
hiccup1 = 3uA
64uA
3V
Seq
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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)
IR3624MTRPBF 功能描述:開關(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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