參數(shù)資料
型號(hào)： NUS3046MNT1G
廠商： ON SEMICONDUCTOR
元件分類： 電源管理
英文描述： Overvoltage Protection IC with Integrated MOSFET
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： 3.30 X 3.30 MM, LEAD FREE, DFN-8
文件頁(yè)數(shù)： 6/7頁(yè)
文件大?。?/td> 143K
代理商： NUS3046MNT1G
NUS3046MN
http://onsemi.com
6
Design Steps for Adjusting the Overvoltage Threshold
1..Use Typical R
in
, and V
th
Values from the Electrical
Specifications
2..Minimize R
in
Effect by Selecting R
1
<< R
in
since:
VOV
Vth(1
R1R2
R1Rin).
3..Let X = R
in
/ R
1
= 100.
4..Identify Required Nominal Overvoltage Threshold.
5..Calculate nominal R
1
and R
2
from Nominal Values:
R1
RinX
(eq. 6)
(eq. 7)
R2
R1
(VOVVth
R1Rin
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 (V
th
)
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(V
CC
,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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NUS3065MU 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Profile Overvoltage Protection IC with Integrated MOSFET
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