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TC54VN2702EZB713 Datasheet(PDF) 6 Page - Microchip Technology

Part No. TC54VN2702EZB713
Description  Voltage Detector
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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 6 page
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TC54
DS21434H-page 6
© 2007 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
prototyping. 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 µA operating current required by the TC54. A
reasonable value for this bleeder current is 100 µA (100
times the 1 µA required by the TC54). For example, if
VDET – = 2V and the desired trip point is 2.5V, the value
of R1 + R2 is 25 kΩ (2.5V/100 µA). The value of R1 + R2
can be rounded to the nearest standard value and
plugged into the equation of Figure 4-1 to calculate
values 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
applications, 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.
Note:
In this example, VSOURCE must be
greater than (VDET –)
V
SOURCE
R
1
R
1
R
2
+
--------------------
V
DET
-
==
TC54
VIN
VOUT
VSS
R1
VSOURCE
R2
Where:
VSOURCE
=
Voltage to be monitored
VDET
=
Threshold Voltage setting of
TC54
VIN
VOUT
VSS
TC54VX
270
Ω
MTP3055EL
VCC
RL
4.3V
VIN
VOUT
VSS
BATLOW
TC54VX
+
VIN
VOUT
VSS
Power Good
TC54VX
+
Pwr
Sply




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