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參數(shù)資料
| 型號： | LM3670 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | RECTIFIER STANDARD SINGLE 1A 100V 100 30A-ifsm 5uA-ir 1V-vf A405 5K/REEL-13 |
| 中文描述： | 微型降壓型DC - DC轉(zhuǎn)換器的超低電壓電路 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 997K |
| 代理商： | LM3670 |
Operation Description
(Continued)
Soft-Start
The LM3670 will have a soft-start circuit that limits in-rush
current during start-up. Typical currents and times are:
Current (mA)
0
70
140
280
620
Duration (μSec)
32
224
256
256
until soft start ends
Note 4:
The first 32μS are to allow the bias currents to stabilize
LDO - Low Drop Out Operation
The LM3670 can operate at 100% duty cycle (no switching,
PMOS switch completely on) for low drop out support of the
output voltage. In this way the output voltage will be con-
trolled down to the lowest possible input voltage.
The minimum input voltage needed to support the output
voltage is
I
LOAD
R
DSON,
Load current
Drain to source resistance of PFET switch
in the triode region
R
INDUCTOR
Inductor resistance
PFET
20075803
FIGURE 5. Operation in PFM Mode and Transfer to PWM Mode
L
www.national.com
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3671MF-1.875 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MF-ADJ | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.2 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.25 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
| LM3671MFX-1.375 | 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3670_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670B-0250 WAF | 制造商:Texas Instruments 功能描述: |
| LM3670MF-1.2 | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3670MF-1.2/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3670MF-1.2/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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