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TPS3780CDRYT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS3780CDRYT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page 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 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: TPS3779 TPS3780 |
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