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參數(shù)資料
| 型號(hào)： | NCP346SN1T1G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Overvoltage Protection IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | LEAD FREE, TSOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大小： | 386K |
| 代理商： | NCP346SN1T1G |
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NCP346
http://onsemi.com
8
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)
This is shown empirically in Tables 2 through 4.
The following tables show an example of obtaining a 6 V
detection voltage from the NCP346SN2T2, which has a
typical V
th
of 5.5 V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP346SN2T1G | 功能描述:監(jiān)控電路 5.5V Overvoltage Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| NCP347AE AV51D WAF | 制造商:ON Semiconductor 功能描述: |
| NCP347AI BB58A WAF | 制造商:ON Semiconductor 功能描述: |
| NCP347MTAETBG | 功能描述:電池管理 OVER VLTG PROTECTION RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| NCP347MTAFTBG | 功能描述:電池管理 OVER VLTG PROTECTION RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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