- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358850 > LM3822MMX-2.0 (NATIONAL SEMICONDUCTOR CORP) Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output PDF資料下載
參數(shù)資料
| 型號： | LM3822MMX-2.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 265K |
| 代理商： | LM3822MMX-2.0 |
Product Operation
The current is sampled by the delta-sigma modulator, as il-
lustrated in Figure 4 The pulse density output of the
delta-sigma modulator is digitally filtered. The digital output
is then compared to the output of a digital ramp generator.
This produces a PWM output. The duty cycle of the PWM
output is proportional to the amount of current flowing.Aduty
cycle of 50% indicates zero current flow. If the current is flow-
ing in positive direction, the duty cycle will be greater than
50%. Conversely, the duty cycle will be less than 50% for
currents flowing in the negative direction. A duty cycle of
95.5% (4.5%) indicates the current is at I
(I
). The IC
can sense currents from I
to +I
. Options for I
MAX
are
1.0A or 2.0A. The sense current is given by:
I
SENSE
= 2.2 (D0.5)(I
MAX
)
where D is the duty cycle of the PWM waveform, and I
is
the full scale current (1.00A or 2.00A). Similarly, the duty
cycle is given by:
D = [I
SENSE
/(2.2 I
MAX
)] + 0.5
For quick reference, see the Conversion Table in Table 1
In this IC, the current is averaged over 50 msec time slots.
Hence, momentary current surges of less than 50 msec are
tolerated.
This
is
a
sampled
data
anti-aliasing filter, provided by the filter capacitor.
The delta-sigma modulator converts the sensed current to
the digital domain. This allows digital filtering, and provides
immunity to current and noise spikes. This type of filtering
would be difficult or impossible to accomplish on an IC with
analog components.
The user also needs to specify the full scale value. See the
Ordering Information table for details.
system
which
requires
an
DS101249-10
FIGURE 4. Functional block diagram of LM3822
L
www.national.com
8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3822MMX-1.0 | Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output |
| LM3822 | Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output |
| LM3842A | CURRENT MODE PWM CONTROLLER |
| LM385BZBG | CAP 39PF 200V 5% NP0(C0G) AXIAL RAD.20 BULK R-MIL-PRF-20 STANDOFF |
| LM385BSTR | Adjustable Micropower Voltage Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3824 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output |
| LM3824MM-1.0 | 制造商:Texas Instruments 功能描述:Battery Charger 8-Pin MSOP Rail 制造商:Texas Instruments 功能描述:IC CURRENT GAUGE FAST SMD MSOP8 |
| LM3824MM-1.0/NOPB | 功能描述:IC CURRENT GAUGE 3% 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| LM3824MM-2.0 | 功能描述:IC CURRENT GAUGE 3% 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 功能:電流開關(guān) 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應(yīng)商設(shè)備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| LM3824MM-2.0/NOPB | 制造商:Texas Instruments 功能描述:Battery Charger 8-Pin MSOP Rail |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。