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| 型号： | TC54VC4502EZB |
| 厂商： | Microchip Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC VOLT DET CMOS 4.5V TO92-3 |
| 标准包装： | 1,000 |
| 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 |
| 电压 - 阀值： | 4.5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-226-3、TO-92-3 标准主体 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 散装 |
| 产品目录页面： | 663 (CN2011-ZH PDF) |
| 其它名称： | 158-1089 158-1089-ND |
TC54
4.0
APPLICATIONS INFORMATION
4.2
Other Applications
4.1
Modifying the Trip Point, V DET –
Low operating power and small physical size make the
TC54 series ideal for many voltage detector applica-
Although the TC54 has a pre-programmed V DET –, it is
sometimes necessary to make adjustments during pro-
totyping. This can be accomplished by connecting an
external resistor divider to a TC54, which has a V DET –
lower than that of V SOURCE ( Figure 4-1 ).
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 1 μA operating current required by the TC54. A rea-
sonable value for this bleeder current is 100 μA (100
circuit that prevents the overheating of the logic-level
MOSFET due to insufficient gate voltage. When the
input signal is below the threshold of the TC54VN, its
output grounds the gate of the MOSFET. Figures 4-3
and 4-4 show the TC54 in conventional voltage
monitoring applications.
times the 1 μA required by the TC54). For example, if
V DET – = 2V and the desired trip point is 2.5V, the value
of R 1 + R 2 is 25 k ? (2.5V/100 μA). The value of
R 1 + R 2 can be rounded to the nearest standard value
and plugged into the equation of Figure 4-1 to calculate
values for R 1 and R 2 . 1% tolerance resistors are
recommended.
V SOURCE
4.3V
V IN
TC54VX
V SS
270 ?
V OUT
V CC
R L
MTP3055EL
R 2
FIGURE 4-2:
MOSFET Low Drive
V IN
TC54
V OUT
Protection.
R 1
V SS
+
V IN
–
1
1
2
VSOURCE
?
R
--------------------- = V
R + R
DET -
TC54VX
V SS
V OUT
BATLOW
Where:
V SOURCE = Voltage to be monitored
V DET – = Threshold Voltage setting of TC54
Note:
In this example, V SOURCE must be
FIGURE 4-3:
Battery Voltage Monitor.
greater than (V DET –)
V IN
FIGURE 4-1:
Modify Trip-Point of the
+
TC54 using External Resistor Divider.
Pwr
Sply
TC54VX
V OUT
Power Good
–
V SS
DS21434J-page 6
FIGURE 4-4:
Power Good Monitor.
? 2001-2011 Microchip Technology Inc.
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