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NUS3046MN Datasheet(PDF) 6 Page - ON Semiconductor |
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NUS3046MN Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 7 page NUS3046MN http://onsemi.com 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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