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參數(shù)資料
| 型號： | LM1851MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 202K |
| 代理商： | LM1851MDC |
Typical Performance Characteristics
Average Trip Time vs
Normal Fault Current
Threshold vs RSET
Fault Current
Output Drive Current vs
Pin 1 Saturation Voltage vs
External Load Current IL
Output Voltage
TLH5177 – 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 (Ife0) the feedback
path status signal (VS) is correspondingly zero Under these
conditions the capacitor discharge current I1 sits quies-
cently at three times its threshold value ITH so that noise
induced charge on the timing capacitor will be rapidly re-
moved When a fault current If 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 If The presence of If during either half-cycle will
cause VS to go high which in turn changes I1 from 3ITH to
ITH Although ITH discharges the timing capacitor during
both half-cycles of the line If only charges the capacitor
during the half-cycle in which If exits pin 2 Thus during one
half-cycle If–ITH charges the timing capacitor while during
the other half-cycle ITH discharges it When the capacitor
voltage reaches 175V the latch engages and turns off Q3
permitting I2 to drive the gate of an SCR
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM1851MWC | 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC |
| LM185D-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| LM185LP-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PBCY3 |
| LM185DR-2-5 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| LM1964VX | SPECIALTY ANALOG CIRCUIT, PQCC20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1851MX | 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 |
| LM1851MX/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 |
| LM1851N | 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 |
| 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 |
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