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参数资料
| 型号： | S-1137D33-U5T1G |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.31 V DROPOUT, PDSO5 |
| 封装： | LEAD FREE, SOT-89, 5 PIN |
| 文件页数： | 14/47页 |
| 文件大小： | 500K |
| 代理商： | S-1137D33-U5T1G |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-1137D35-M5T1U | 功能描述:IC REG LINEAR 300MA SOT23-5 制造商:ablic u.s.a. inc. 系列:* 包装:剪切带（CT） 零件状态:在售 电流 - 输出:300mA 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装: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: |
| S114 | 功能描述:拨动开关 DPST ON NONE OFF 5A RoHS:否 制造商:C&K Components 触点形式:DPDT 开关功能:ON - ON - ON 电流额定值: 电压额定值 AC:20 V 电压额定值 DC:20 V 功率额定值:0.4 VA 端接类型:V-Bracket 安装风格: 端子密封:Epoxy 触点电镀: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 |
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