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参数资料
| 型号： | LM1851MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC |
| 封装： | WAFER |
| 文件页数： | 5/10页 |
| 文件大小： | 202K |
| 代理商： | LM1851MWC |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1851MX | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| LM1851MX/NOPB | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| LM1851N | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| LM1851N/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Ground Fault Interrupter |
| LM1851N/B+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Ground Fault Interrupter |
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