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參數(shù)資料
| 型號： | S-1137D29-U5T1U |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.9 V FIXED POSITIVE LDO REGULATOR, 0.31 V DROPOUT, PDSO5 |
| 封裝： | HALOGEN AND LEAD FREE, SOT-89, 5 PIN |
| 文件頁數(shù)： | 14/47頁 |
| 文件大小： | 500K |
| 代理商： | S-1137D29-U5T1U |
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HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
Rev.2.0_01
S-1137 Series
Seiko Instruments Inc.
21
7.
Soft-start function
The S-1137 Series has a soft-start circuit to suppress the rush current (IRUSH) and overshoot of the output voltage
generated at power-on the application or at turn-on the ON / OFF pin.
After immediately power-on the application or at turn-on the ON / OFF pin, the output voltage slowly rises. The time
that the output voltage rises to 99% (tSS) is adjustable by a capacitor (CSS) externally connected between the SSC and
VSS pins. When CSS = 1 nF, the time is 0.7 ms (typ.). When the ON / OFF pin is off, the electric charge charged in the
external capacitor (CSS) will be discharged by the discharge shunt transistor.
The soft-start time (tSS) is defined by time consonants of the built-in constant current (approx. 1 μA) and the external
capacitor (CSS):
tSS (ms) = soft-start coefficient × CSS (nF)
The soft-start coefficient (25
°C) is as follows.
Min. : 0.4,
Typ. : 0.7,
Max. : 1.2
Input
voltage
(VIN)
SSC pin
voltage
(VSSC)
Output
voltage
(VOUT)
VOUT × 0.99
t [ms]
Soft-start time (tSS)
approx.0.7 V
Figure 20
The rush current can be suppressed greatly by the soft-start function.
As the value of the external capacitor is larger, the rush current decreases more.
Figure 21 shows the waveform example of the rush current.
Input
voltage
(VIN)
Rush
current
(IRUSH)
t [ms]
Without soft-start : about 400 mA at the peak
With soft-start : about 20 mA at the peak
Figure 21
Waveform Example of Rush Current
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| S-1137D30-M5T1U | 功能描述:IC REG LINEAR 300MA SOT23-5 制造商:ablic u.s.a. inc. 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 穩(wěn)壓器數(shù):1 電流 - 輸出:300mA 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
| S-1137D33-I6T2G | 功能描述:低壓差穩(wěn)壓器 - LDO LINEAR LDO REG HI 60UA IQ 300MA IOUT RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-1137D35-M5T1U | 功能描述:IC REG LINEAR 300MA SOT23-5 制造商:ablic u.s.a. inc. 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 電流 - 輸出:300mA 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
| S1138 | 制造商:LAPP/CONTACT CONNECTORS 功能描述:CONNECTOR, STRAIN RELIEF, LIQUID TIGHT, NON METALLIC, NPT-3/8 INCH THREAD, GREY |
| S113B | 制造商:Switchcraft 功能描述: |
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