NUS3046MN ON Semiconductor, NUS3046MN Datasheet - Page 6

• Manufacturer Part Number: NUS3046MN
• Description: Overvoltage Protection Ic With Integrated Mosfet
• Manufacturer: ON Semiconductor

Design Steps for Adjusting the Overvoltage Threshold
1..Use Typical R
2..Minimize R
3..Let X = R
4..Identify Required Nominal Overvoltage Threshold.
5..Calculate nominal R
6..Pick Standard Resistor Values as Close as Possible to
7..Use min/max Data and Resistor Tolerances to
V OVmin + V thmin (1 ) R 1min R 2max ) R 1min R inmax )
V OVmax + V thmax (1 ) R 1min R 2max ) R 1max R inmin )
V OVtyp + V thtyp (1 ) R 1typ R 2typ ) R 1typ R intyp )
Specifications
these Values
Determine Overvoltage Detection Tolerance:
V OV + V th (1 ) R 1 R 2 ) R 1 R in ).
R 1 + R in X
in
in
/ R
R 2 +
in
Effect by Selecting R
1
, and V
= 100.
(V OV V th * R 1 R in * 1)
1
and R
th
Values from the Electrical
2
R 1
from Nominal Values:
1
<< R
in
since:
(eq. 10)
(eq. 11)
(eq. 6)
(eq. 7)
(eq. 8)
(eq. 9)
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6
comparator, so the minimum input threshold voltage (V
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
V(V CC , IN) min + V CCmax * (R1min (R1min ) R2max))
V(V CC , IN)typ + V CCmax * (R1typ (R1typ ) R2typ)) (eq. 13)
V(V CC , IN) max + V CCmax * (R1max (R1max ) R2min))
The specification takes into account the hysteresis of the
maximum V(V
CC
,IN)
(eq. 12)
(eq. 14)
th
)