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参数资料
| 型号： | BU4247F |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | ROHS COMPLIANT, SOP-4 |
| 文件页数： | 9/11页 |
| 文件大小： | 282K |
| 代理商： | BU4247F |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| BU4247F-TR | 功能描述:电压监测器/监控器 LOW VOLT DETEC VOLT 0.9V RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| BU4247FVE | 制造商:ROHM 制造商全称:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
| BU4247FVE-TR | 功能描述:电压监测器/监控器 LOW VOLT DETEC VOLT 0.9V RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| BU4247G | 制造商:ROHM 制造商全称:Rohm 功能描述:Low Voltage Detector IC with Adjustable Output Delay |
| BU4247G-TR | 功能描述:电压监测器/监控器 CMOS LOW VOLT DETEC RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
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