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參數(shù)資料
| 型號： | IR3622AMPBF |
| 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)： | 13/33頁 |
| 文件大?。?/td> | 690K |
| 代理商： | IR3622AMPBF |
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IR3622AMPbF
www.irf.com
Soft-Start (cont.)
During power up, the converter output starts at
zero and thus the voltage at Fb is about 0V. An
internal voltage-controlled current source (64uA)
injects current into the Fb pin and generates a
voltage about 1.6V (64ux25K) across the
negative input of error amplifier, see figure 7.
This keeps the output of the error amplifier low.
The magnitude of this current is inversely
proportional to the voltage at the soft-start pin.
The 23uA 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 the negative input of error amplifier.
When the soft-start voltage reaches about 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
1.8V. 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 IR3622A
Fig. 8: Theoretical operation waveforms
during soft-start
)
5
(
-
-
-
V
(
8
0
ms
T
A
23
C
start
SS
)
.
)
(
*
)
(
μ
V
1
V
8
.
1
C
T
μA
23
ss
start
=
13
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 = 23uA
Track
POR
OCP2
I
hiccup2 = 3uA
64uA
3V
E/A1
VP1
Fb1
SS1/SD1
I
SS1 = 23uA
POR
OCP1
I
hiccup1 = 3uA
64uA
3V
Seq
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| IR3622AMTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR 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 |
| 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 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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| 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 |
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