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| 型号： | TC1270AMVRCTR |
| 厂商： | Microchip Technology |
| 文件页数： | 26/48页 |
| 文件大小： | 0K |
| 描述： | IC RESET MONITOR 4.38V SOT143-4 |
| 标准包装： | 3,000 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.38V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143 |
| 包装： | 带卷 (TR) |
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TC1270A/70AN/71A
5.4
Modifying The Trip Point, V TRIP
5.5
MOSFET Low-Drive Protection
Although the TC127XA device has a fixed voltage trip
point (V TRIP ), it can be necessary to make custom
adjustments. This is accomplished by connecting an
external resistor divider to the TC127XA V DD pin. This
causes the V SOURCE voltage to be higher than it is
when the TC127XA input equals its V TRIP voltage
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 15 μA maximum operating current required by the
Low operating power and small physical size make the
TC1270AN series ideal for many voltage detector
applications. Figure 5-6 shows a low-voltage gate drive
protection circuit that prevents the logic-level MOSFET
from overheating due to insufficient gate voltage. When
the input signal is below the threshold of the
TC1270AN, its output grounds the gate of the
MOSFET.
TC127XA. A reasonable value for this bleeder current
is 1 mA (67 times the 10 μA required by the TC127XA).
For example, if V TRIP = 2V and the desired trip point is
2.5V, the value of R 1 + R 2 is 2.5 k ? (2.5V/1 mA). The
value of R 1 + R 2 can be rounded to the nearest
standard value and plugged into the equation shown in
V TRIP
270 ? ( 1 )
V DD
V DD
R L
1% tolerance resistors are recommended.
V SOURCE
TC1270AN
V SS
RST
MTP3055EL
R 2
V DD
TC127XA
RST
or RST
Note 1:
This resistance should be sized appro-
priately for the selected trip point volt-
age related to the V OL operation.
R 1
V SS
FIGURE 5-6:
Protection.
MOSFET Low-Drive
? R --------------------
1
+ R
V
SOURCE
R
1 2
? V
TRIP
Where:
V SOURCE = Voltage to be monitored
V TRIP = Threshold Voltage setting
Note: In this example, V SOURCE must be greater
than V TRIP .
FIGURE 5-5:
Modifying Trip-Point using
External Resistor Divider.
DS22035D-page 26
? 2007-2011 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1270AN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANLBVCTTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANLBVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ANLCVCTTR | 功能描述:监控电路 Vltg Detector 4.63V Reset Threshold RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TC1270ANLCVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
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