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參數(shù)資料
| 型號(hào)： | LM1851N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Ground Fault Interrupter |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 165K |
| 代理商： | LM1851N |
Typical Performance Characteristics
Average Trip Time vs
Fault Current
Normal Fault Current
Threshold vs R
SET
Output Drive Current vs
Output Voltage
Pin 1 Saturation Voltage vs
External Load Current, I
L
TL/H/5177–4
Circuit Description
(Refer to Block and Connection Diagram)
The LM1851 operates from 26V as set by an internal shunt
regulator, D3. In the absence of a fault (I
f
e
0) the feedback
path status signal (V
S
) is correspondingly zero. Under these
conditions the capacitor discharge current, I
1
, sits quies-
cently at three times its threshold value, I
TH
, so that noise
induced charge on the timing capacitor will be rapidly re-
moved. When a fault current, I
f
, is induced in the secondary
of the external sense transformer, the operational amplifier,
A1, uses feedback to force a virtual ground at the input as it
extracts I
f
. The presence of I
f
during either half-cycle will
cause V
S
to go high, which in turn changes I
1
from 3I
TH
to
I
TH
. Although I
TH
discharges the timing capacitor during
both half-cycles of the line, I
f
only charges the capacitor
during the half-cycle in which I
f
exits pin 2. Thus during one
half-cycle I
f
–I
TH
charges the timing capacitor, while during
the other half-cycle I
TH
discharges it. When the capacitor
voltage reaches 17.5V, the latch engages and turns off Q3
permitting I
2
to drive the gate of an SCR.
4
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1851N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Ground Fault Interrupter |
| LM1851N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Ground Fault Interrupter |
| LM1851N/NOPB | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| LM185-2.5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Voltage Reference |
| LM185-2.5 MD8 | 制造商:Texas Instruments 功能描述:DIE FORM - Gel-pak, waffle pack, wafer, diced wafer on film |
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