Electronic Components Datasheet Search
Selected language     English  ▼


TC54VN3002EZB713 Datasheet(PDF) 6 Page - Microchip Technology

Part No. TC54VN3002EZB713
Description  Voltage Detector
Download  20 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo 

 6 page
background image
TC54
DS21434J-page 6
 2001-2011 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 µA operating current required by the TC54. A rea-
sonable 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 k (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 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 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.
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
-
=
VIN
VOUT
VSS
R1
VSOURCE
R2
Where:
VSOURCE = Voltage to be monitored
VDET – = Threshold Voltage setting of TC54
TC54
VIN
VOUT
VSS
270
MTP3055EL
VCC
RL
4.3V
TC54VX
VIN
VOUT
VSS
BATLOW
+
TC54VX
VIN
VOUT
VSS
Power Good
+
Pwr
Sply
TC54VX




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 


Datasheet Download




Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl