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參數(shù)資料
| 型號(hào)： | IR3629 |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| 中文描述： | 高頻同步PWM降壓控制器與電源良好輸出 |
| 文件頁(yè)數(shù)： | 23/23頁(yè) |
| 文件大?。?/td> | 598K |
| 代理商： | IR3629 |
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IR3629/IR3629A MPbF
11/26/2007
Soft-Start
The IR3629/29A has a programmable soft-start
to control the output voltage rise and limit the
inrush current during start-up.
To ensure
correct
start-up,
the soft-start
sequence initiates when Vcc and Vc rise above
their threshold and generate the Power On
Ready (POR) signal. The soft-start function
operates by sourcing current to charge an
external capacitor to about 3V.
Initially, the soft-start function clamps the output
of error amplifier by injecting a current (35uA)
into the Fb pin and generates a voltage about
0.84V (35ux24K) across the negative input of
error amplifier (see figure 5).
The magnitude of the injected current is inversely
proportional to the voltage at the soft-start pin. As
the soft-start voltage ramps up, the injected
current decreases linearly and so does the
voltage at the negative input of error amplifier.
When the soft-start capacitor voltage is around
1V, the voltage at the positive input of the error
amplifier is approximately 0.6V.
The output of the error amplifier will start
increasing and generating the first PWM signal.
As the soft-start capacitor voltage continues to
rise up, the current flowing into the Fb pin will
keep decreasing.
The feedback voltage increases linearly as the
soft-start voltage ramps up. When soft-start
voltage is around 2V the output voltage reaches
the steady state and the injected current is zero.
Figure 6 shows the theoretical operating
waveforms during soft-start.
The output voltage 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 and can be
estimated by:
Fig. 5: Soft-Start circuit for IR3629/29A
Fig. 6: Theoretical operation waveforms
during soft-start
20uA
40uA
POR
Error Amp
SS/SD
Fb
Comp
24K
0.6V
24K
3V
Soft-Start
Voltage
Voltage at negative input
of Error Amp
Voltage at Fb pin
Current flowing
into Fb pin
40uA
0uA
0V
0.6V
0.96V
0.6V
0V
3V
2V
1V
Output of UVLO
POR
For a given start-up time, the soft-start capacitor
(nF) can be estimated as:
V
1
V
2
C
T
μA
20
ss
start
=
)
1
--(
ms
T
A
20
C
start
SS
)
(
*
μ
9
35uA
0.84V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| IR3629A | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
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| IR3629AMTRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)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(lèi)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) |
| IR3629MTRPBF | 功能描述:電壓模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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