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参数资料
| 型号： | LM3824 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output |
| 中文描述： | 精密电流计IC，内部零欧姆检测元件和PWM输出 |
| 文件页数： | 11/12页 |
| 文件大小： | 265K |
| 代理商： | LM3824 |
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. A duty
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
MAX (IMAX). The IC
can sense currents from I
MAX to +IMAX. Options for IMAX are
1.0A or 2.0A. The sense current is given by:
I
SENSE = 2.2 (D0.5)(IMAX)
where D is the duty cycle of the PWM waveform, and I
MAX is
the full scale current (1.0A or 2.0A). Similarly, the duty cycle
is given by:
D=[I
SENSE/(2.2 IMAX)] + 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 system which requires an
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.
DS200007-10
FIGURE 4. Functional block diagram of LM3824
LM3824
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 稳流/电流管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 功能:电流开关 检测方法:- 精确度:±10% 输入电压:1.7 V ~ 5.5 V 电流 - 输出:600mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFQFN 供应商设备封装:10-UTQFN（1.4x1.8） 包装:管件 |
| LM3824MM-2.0 | 功能描述:IC CURRENT GAUGE 3% 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳流/电流管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 功能:电流开关 检测方法:- 精确度:±10% 输入电压:1.7 V ~ 5.5 V 电流 - 输出:600mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFQFN 供应商设备封装:10-UTQFN（1.4x1.8） 包装:管件 |
| LM3824MM-2.0/NOPB | 制造商:Texas Instruments 功能描述:Battery Charger 8-Pin MSOP Rail |
| LM3824MMX-1.0 | 功能描述:IC CURRENT GAUGE PRECISION 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳流/电流管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 功能:电流开关 检测方法:- 精确度:±10% 输入电压:1.7 V ~ 5.5 V 电流 - 输出:600mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFQFN 供应商设备封装:10-UTQFN（1.4x1.8） 包装:管件 |
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