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參數(shù)資料
| 型號： | TC54VN3201EZB |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBCY3 |
| 封裝： | TO-92, 3 PIN |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 340K |
| 代理商： | TC54VN3201EZB |
TC54
DS21434E-page 6
2003 Microchip Technology Inc.
4.0
APPLICATIONS INFORMATION
4.1
Modifying The Trip Point, VDET-
Although the TC54 has a pre-programmed VDET-, 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 VDET-
lower than that of VSOURCE (Figure 4-1).
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 1 A operating current required by the TC54. A rea-
sonable value for this bleeder current is 100 A (100
times the 1 A required by the TC54). For example, if
VDET- = 2V and the desired trip point is 2.5V, the value
of R1 + R2 is 25 k (2.5V/100 A). The value of R1 +
R2 can be rounded to the nearest standard value and
plugged into the equation of Figure 4-1 to calculate val-
ues for R1 and R2. 1% tolerance resistors are
recommended.
FIGURE 4-1:
Modify trip-point of the TC54
using external resistor divider.
4.2
Other Applications
Low operating power and small physical size make the
TC54 Series ideal for many voltage detector applica-
tions, such as those shown in Figures 4-2, 4-3 and 4-4.
Figure 4-2 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 TC54VN, its
output grounds the gate of the MOSFET. Figure 4-3
and Figure 4-4 show the TC54 in conventional voltage
monitoring applications.
FIGURE 4-2:
MOSFET Low Drive
Protection.
FIGURE 4-3:
Battery Voltage Monitor.
FIGURE 4-4:
Power Good Monitor.
Where:
VSOURCE = Voltage to be monitored
(VDET-) = Threshold Voltage Setting of TC54
Note:
In this example, VSOURCE must be
greater than (VDET-)
VSOURCE
R1
R1 R2
+
--------------------
VDET-
==
TC54
VIN
VOUT
VSS
R1
VSOURCE
R2
VIN
VOUT
VSS
TC54VX
270
MTP3055EL
VCC
RL
4.3V
VIN
VOUT
VSS
BATLOW
TC54VX
+
––
VIN
VOUT
VSS
Power Good
TC54VX
+
–
Pwr
Sply
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