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参数资料
| 型号： | IR3720MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MONITOR 10-DFN |
| 标准包装： | 1 |
| 系列： | TruePower™ |
| 应用： | 电源监控器 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 电流 - 电源： | 480µA |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | IR3720MTRPBFDKR |
ERROR MANAGEMENT
Component value errors external to the IR3720
contribute to power and current measurement error.
The power reported by the IR3720 is a function not
only of actual power or current, but also of products
and quotients of R T , R CS1 , R CS2 , DCR (or R SHUNT ), as
well as parameters internal to the IR3720. The
tolerance of these components increases the total
power or current error. Small signal resistors are
typically available in 1% tolerance, but 0.1% parts are
available. Shunts are also available at 1% or 0.1%
tolerance. The DCR tolerance of inductors can be
5%, but 3% are available. Fortunately, it is not typical
that worst-case errors would systematically stack in
one direction. It is statistically likely that a high going
value would be paired with a low going value to
somewhat cancel the error. Because of this,
tolerances can be added in quadrature (RSS). As an
example, a 3% DCR used with a 1% R T , a 1% R CS ,
and 3.3% IR3720 contributes
Quantization error occurs in digital systems because
the full scale is partitioned into a finite number of
intervals and the number of the interval containing
the measured value is reported. It is not likely that the
measured value would correspond exactly to the
center of the interval. The error could be as large as
half the width of the interval. With a binary word size
of eight, full scale is partitioned into 255 intervals.
Consider a measurement made near full scale. Any
signal in this interval is less than ± .2% (one-half of
100% / 256) away from the interval’s center, and
would therefore never have more error than that due
to quantization. On the other hand, consider a
measurement at one-tenth full scale. One-half of an
interval size at this level corresponds to 2% of the
reported value! Relative quantization error increases
as the measured value becomes small compared to
the full-scale value.
Quantization error can be reduced by averaging a
sequence of returned values.
( 0 . 03 ) 2 + ( 0 . 01 ) 2 + ( 0 . 01 ) 2 + ( 0 . 033 ) 2 ≈ 4 . 7 %
error to a typical system.
Page 13 of 20
www.irf.com
09/09/08
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3721 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Monitor IC with Analog Output |
| IR3721_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Power Monitor IC with |
| IR3721MPBF | 制造商:International Rectifier 功能描述:Power Monitor IC with Analog Output 制造商:IR 功能描述:IR3721 Series 3.10 V 512 kHz Power Monitor IC with Analog Output - DFN-10 |
| IR3721MTRPBF | 功能描述:电流和电力监控器、调节器 PWR MONITOR IC TruePWR 5mV 150mV 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 |
| IR3725 | 制造商:IRF 制造商全称:International Rectifier 功能描述:INPUT POWER MONITOR WITH DIGITAL INTERFACE |
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