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參數(shù)資料
| 型號： | S-1137D35-U5T1U |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 3.5 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?。?/td> | 500K |
| 代理商： | S-1137D35-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
相關(guān)PDF資料 |
PDF描述 |
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| S-1165B15MC-N6A-TF | 5.5 V FIXED POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO5 |
| S-1165B18MC-N6D-TF | 1.8 V FIXED POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO5 |
| S-1165B27MC-N6M-TF | 2.7 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| S-1165B29MC-N6O-TF | 2.9 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| S-1165B33MC-N6S-TF | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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: |
| S114 | 功能描述:撥動開關(guān) DPST ON NONE OFF 5A RoHS:否 制造商:C&K Components 觸點(diǎn)形式:DPDT 開關(guān)功能:ON - ON - ON 電流額定值: 電壓額定值 AC:20 V 電壓額定值 DC:20 V 功率額定值:0.4 VA 端接類型:V-Bracket 安裝風(fēng)格: 端子密封:Epoxy 觸點(diǎn)電鍍:Gold 照明:Not Illuminated |
| S-114 | 制造商:Nihon Kaiheiki Ind Co Ltd 功能描述:30V 30000(@BIv) / 15000(dCIv) bL +85 -30 27.8mm 17.6mm 45.4mm Bulk 制造商:Nihon Dempa Kogyo Co (NDK) 功能描述:Switch, toggle, solder terminal, 5A typ |
| S-1-1-4 | 制造商:Cooper Bussmann 功能描述:FUSE 1.25A 125V TIME DLY ACTING 2PIN - Bulk |
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