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TPS3780DDRYT Datasheet(PDF) 8 Page - Texas Instruments

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No. de Pieza. TPS3780DDRYT
Descripción  Low-Power, Dual-Voltage Detector in Small SON Package
Descarga  17 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS3780DDRYT Datasheet(HTML) 8 Page - Texas Instruments

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MON(no UV)
IT+
R1
V
= 1 +
× V
R2
§
·
¨
¸
©
¹
MON(UV)
IT
R1
V
= 1 +
× V
R2
§
·
¨
¸
©
¹
SENSE1
SENSE2
R1_V2
V2
R2_V1
R2_V2
R1_V1
V1
VCC
GND
OUT1
OUT2
TPS3780
VCC
To System
Reset
TPS3779
TPS3780
SBVS216B – SEPTEMBER 2012 – REVISED MAY 2013
www.ti.com
The TPS3779 and TPS3780 also have adjustable sense inputs that can be configured to monitor voltages using
external resistor divider, as shown in Figure 14.
Figure 14. Application Diagram
The resistor divider values and target threshold voltage can be calculated by using Equation 1 and Equation 2 to
determine VMON(no UV) and VMON(UV), respectively.
(1)
(2)
Where:
R1 and R2 are the resistor values for the resistor divider on the SENSEx pins.
VMON(UV) is the target voltage at which an undervoltage condition is detected.
VMON(no UV) is the target voltage at which an undervoltage condition is removed when VMON rises.
Choose RTOTAL ( = R1 + R2) so that the current through the divider is approximately 100 times higher than the
input current at the SENSEx pins. The resistors can have high values to minimize current consumption as a
result of low input bias current without adding significant error to the resistive divider. For details on sizing input
resistors, refer to Application Report SLVA450, Optimizing Resistor Dividers at a Comparator Input, available for
download from www.ti.com.
8
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: TPS3779 TPS3780


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