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NUS3046MN Datasheet(PDF) 6 Page - ON Semiconductor

Part # NUS3046MN
Description  Overvoltage Protection IC with Integrated MOSFET
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NUS3046MN Datasheet(HTML) 6 Page - ON Semiconductor

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NUS3046MN
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6
Design Steps for Adjusting the Overvoltage Threshold
1..Use Typical Rin, and Vth Values from the Electrical
Specifications
2..Minimize Rin Effect by Selecting R1 << Rin since:
VOV + Vth(1 ) R1 R2 ) R1 Rin).
(eq. 6)
3..Let X = Rin / R1 = 100.
4..Identify Required Nominal Overvoltage Threshold.
5..Calculate nominal R1 and R2 from Nominal Values:
R1 + Rin X
(eq. 7)
R2 +
R1
(VOV Vth * R1 Rin * 1)
(eq. 8)
6..Pick Standard Resistor Values as Close as Possible to
these Values
7..Use min/max Data and Resistor Tolerances to
Determine Overvoltage Detection Tolerance:
VOVmin + Vthmin(1 ) R1min R2max ) R1min Rinmax)
(eq. 9)
VOVtyp + Vthtyp(1 ) R1typ R2typ ) R1typ Rintyp)
(eq. 10)
VOVmax + Vthmax(1 ) R1minR2max ) R1max Rinmin)
(eq. 11)
The specification takes into account the hysteresis of the
comparator, so the minimum input threshold voltage (Vth)
is the falling voltage detection point and the maximum is the
rising voltage detection point. One should design the input
supply such that its maximum supply voltage in normal
operation is less than the minimum desired overvoltage
threshold.
8..Use worst case resistor tolerances to determine the
maximum V(VCC,IN)
V(VCC, IN) min + VCCmax *(R1min (R1min ) R2max))
(eq. 12)
V(VCC,IN)typ + VCCmax *(R1typ (R1typ ) R2typ)) (eq. 13)
V(VCC, IN) max + VCCmax *(R1max (R1max ) R2min))
(eq. 14)


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