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TPS3700 датащи(PDF) 11 Page - Texas Instruments

номер детали TPS3700
подробное описание детали  Window Comparator for Over- and Undervoltage Detection
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TPS3700 датащи(HTML) 11 Page - Texas Instruments

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R =
2
R
TOTAL
V
MON(UV)
- R
3
´ (V
V
ITP
HYS
-
)
R =
2
R
TOTAL
V
(no UV)
MON
´ VITP - R3
R =
3
R
TOTAL
V
MON(OV)
´ VITP
TPS3700
www.ti.com
SBVS187C – FEBRUARY 2012 – REVISED MAY 2013
The resistor divider values and target threshold voltage can be calculated by using Equation 1 through
Equation 4:
RTOTAL = R1 + R2 + R3
(1)
Choose RTOTAL such that current through the divider is approximately 100x higher than the input current at the
INA+ and INB– 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. Refer to application note Optimizing Resistor
Dividers at a Comparator Input (SLVA450) for details on sizing input resistors.
R3 is determined by Equation 2:
where:
VMON(OV) is the target voltage at which an overvoltage condition is detected
(2)
R2 is determined by either Equation 3 or Equation 4:
where:
VMON(no UV) is the target voltage at which an undervoltage condition is removed as VMON rises
(3)
where:
VMON(UV) is the target voltage at which an undervoltage condition is detected
(4)
For more application information on the TPS3700, refer to Figure 19 through Figure 22.
IMMUNITY TO INPUT PIN VOLTAGE TRANSIENTS
The TPS3700 is relatively immune to short voltage transient spikes on the input pins. Sensitivity to transients is
dependent on both transient duration and amplitude; refer to the Typical Characteristics curve, Minimum Pulse
Width vs Threshold Overdrive Voltage (Figure 8).
Copyright © 2012–2013, Texas Instruments Incorporated
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