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参数资料
| 型号： | TC1270ASCVRCTR |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | LEAD FREE, PLASTIC, SOT-143, 4 PIN |
| 文件页数： | 17/40页 |
| 文件大小： | 551K |
| 代理商： | TC1270ASCVRCTR |
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TC1270A/70AN/71A
DS22035B-page 24
2007 Microchip Technology Inc.
5.4
Modifying The Trip Point, VTRIP
Although the TC127XA device has a fixed voltage trip
point (VTRIP), it is sometimes necessary to make
custom adjustments. This can be accomplished by
connecting an external resistor divider to the TC127XA
VDD pin. This causes the VSOURCE voltage to be at a
higher voltage than when the TC127XA input equals
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 15 A maximum operating current required by the
TC127XA. A reasonable value for this bleeder current
is 1 mA (67 times the 10 A required by the TC127XA).
For example, if VTRIP = 2V and the desired trip point is
2.5V, the value of R1 + R2 is 2.5 kΩ (2.5V/1 mA). The
value of R1 + R2 can be rounded to the nearest stan-
dard value and plugged into the equation of Figure 5-5
to calculate values for R1 and R2. 1% tolerance resis-
tors are recommended.
FIGURE 5-5:
Modify Trip-Point using
External Resistor Divider.
5.5
MOSFET Low-Drive Protection
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 overheating of the
logic-level MOSFET due to insufficient gate voltage.
When the input signal is below the threshold of the
TC1270AN, its output grounds the gate of the
MOSFET.
FIGURE 5-6:
MOSFET Low-Drive
Protection.
TC127XA
VDD
RST
VSS
R1
VSOURCE
R2
or RST
V
SOURCE
R
1
R
1
R
2
+
--------------------
×
V
TRIP
=
Where:
Note:
In this example, VSOURCE must be
greater than (VTRIP).
VSOURCE = Voltage to be monitored
VTRIP = Threshold Voltage setting
VDD
RST
VSS
TC1270AN
270
Ω (1)
MTP3055EL
VDD
RL
VTRIP
Note 1:
This resistance needs to be properly
sized for the selected Trip point voltage
related to the VOL operation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1270ASVCTTR | 功能描述:监控电路 5Pin uP Reset Mon 2.93V Reset Thresh 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 |
| TC1270ASVRCTR | 功能描述:监控电路 4Pin uP Reset Mon 2.93V Reset Thresh 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 |
| TC1270ATBVCTTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ATBVRCTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Voltage Supervisor with Manual Reset Input |
| TC1270ATCVCTTR | 功能描述:监控电路 Vltg Detector 3.08V 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 |
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