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參數資料
| 型號： | LM3812MX-7.0/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 705K |
| 代理商： | LM3812MX-7.0/NOPB |
LM3812/LM3813
Precision Current Gauge IC with Ultra Low Loss Sense
Element and PWM Output
General Description
The LM3812/LM3813 Current Gauges provide easy to use
precision current measurement with virtually zero insertion
loss (typically 0.004
). The LM3812 is used for high-side
sensing and the LM3813 is used for low-side sensing.
A Delta Sigma analog to digital converter is incorporated to
precisely measure the current and to provide a current av-
eraging function. Current is averaged over 50 msec time
periods in order to provide immunity to current spikes. The
ICs have a pulse-width modulated (PWM) output which indi-
cates the current magnitude and direction. The shutdown pin
can be used to inhibit false triggering during start-up, or to
enter a low quiescent current mode.
The LM3812 and LM3813 are factory-set in two different
current options. The sense range is 1A to +1A or 7A to
+7A. The sampling interval for these parts is 50ms. If faster
sampling is desired, please refer to the data sheets for the
part numbers LM3814 and LM3815.
Key Specifications
n
Ultra low insertion loss (typically 0.004
)
n
2V to 5.25V supply range
n ±
2% accuracy at room temperature (includes accuracy
of the internal sense element) (LM3812-1.0,
LM3813-1.0)
n
Low quiescent current in shutdown mode (typically
2.5 A)
n
50 msec sampling interval
Features
n
No external sense element required
n
PWM output indicates the current magnitude and
direction
n
PWM output can be interfaced with microprocessors
n
Precision
Σ current-sense technique
n
Low temperature sensitivity
n
Internal filtering rejects false trips
n
Internal Power-On-Reset (POR)
Applications
n
Battery charge/discharge gauge
n
Motion control diagnostics
n
Power supply load monitoring and management
n
Resettable smart fuse
Connection Diagrams
10012201
Top View
LM3812
for High-Side Sensing
10012203
Top View
LM3813
for Low-Side Sensing
February 2005
LM3812/LM3813
Precision
Current
Gauge
IC
with
Ultra
Low
Loss
Sense
Element
and
PWM
Output
2005 National Semiconductor Corporation
DS100122
www.national.com
相關PDF資料 |
PDF描述 |
|---|---|
| LM3812M-7.0/NOPB | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| LM3813M-1.0/NOPB | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| LM3814MX-1.0/NOPB | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| LM3815MX-1.0/NOPB | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| LM3814M-1.0/NOPB | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3812PM-1.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Sense Gauge |
| LM3812PM-7.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Sense Gauge |
| LM3813 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output |
| LM3813EVAL | 功能描述:EVALUATION BOARD FOR LM3813 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| LM3813FM-1.0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Sense Gauge |
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