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參數(shù)資料
| 型號： | BU4346G |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | ROHS COMPLIANT, SSOP-5 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 282K |
| 代理商： | BU4346G |
Technical Note
7/10
BU42
□□G, BU42□□F, BU42□□FVE, BU43□□G, BU43□□F, BU43□□FVE series
www.rohm.com
2009.06 - Rev.B
2009 ROHM Co., Ltd. All rights reserved.
2) Examples of the power supply with resistor dividers
In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through
current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output
oscillatory state).
(Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level
switches from “High” to “Low” or vice versa.)
Fig.20
A voltage drop of [the through-current (I1)] × [input resistor (R2)] is caused by the through current, and the input voltage to
descends, when the output switches from “Low” to “High”. When the input voltage decreases and falls below the detection
voltage, the output voltage switches from “High” to “Low”. At this time, the through-current stops flowing through output
“Low”, and the voltage drop is eliminated. As a result, the output switches from “Low” to “High”, which again causes the
through current to flow and the voltage drop. This process is repeated, resulting in oscillation.
Consider the use of BU42
□□ when the power supply input it with resistor dividers.
Fig.21 Current Consumption vs. Power Supply Voltage
*This data is for reference only.
The figures will vary with the application, so please confirm actual operating conditions before use.
VOUT
R2
VDD
BU42□□
BU43□□
GND
R1
I1
V1
CIN
CL
IDD
VDD
VDET
0
Through
Current
VDD - IDD Peak Current Ta=25°C
0.001
0.01
0.1
1
10
34
56
78
9
10
VDD[V]
IDD-peak[mA]
BU43xx
BU42xx
BD52xx
BD53xx
Temp - IDD(BU42xx)
0.0
0.5
1.0
1.5
2.0
2.5
-50 -30 -10
10
30
50
70
90
110 130
Temp
IDD
peak
Current[mA]
VDD3V
VDD6V
VDD7V
VDD4V
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BU4346G-TR | 功能描述:電壓監(jiān)測器/監(jiān)控器 CMOS LOW VOLT DETEC RoHS:否 制造商:Texas Instruments 監(jiān)測電壓數(shù):2 監(jiān)測電壓:Adjustable 輸出類型:Open Drain 欠電壓閾值: 過電壓閾值: 準確性:1 % 工作電源電壓:1.5 V to 6.5 V 工作電源電流:1.8 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SON-6 安裝風格:SMD/SMT |
| BU4347 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low Voltage Free Delay Time Setting CMOS Voltage Detector IC Series |
| BU4347F | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
| BU4347F-TR | 功能描述:電壓監(jiān)測器/監(jiān)控器 CMOS LOW VOLT DETEC RoHS:否 制造商:Texas Instruments 監(jiān)測電壓數(shù):2 監(jiān)測電壓:Adjustable 輸出類型:Open Drain 欠電壓閾值: 過電壓閾值: 準確性:1 % 工作電源電壓:1.5 V to 6.5 V 工作電源電流:1.8 uA 最大工作溫度:+ 125 C 封裝 / 箱體:SON-6 安裝風格:SMD/SMT |
| BU4347FVE | 制造商:ROHM 制造商全稱:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
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