- 您现在的位置：买卖IC网 > PDF目录1809 > IR3721MTRPBF (International Rectifier)IC POWER SUPPLY MONITOR 10-DFN PDF资料下载
参数资料
| 型号： | IR3721MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MONITOR 10-DFN |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 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： | 350µA |
| 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 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3721MTRPBFDKR |
IR3721
DATA SHEET
COMPONENT SELECTION GUIDELINES
Use a 0.1 μ F, 6.3V, X7R ceramic bypass capacitor
from VDD to GND and from VK to GND.
Filter the DI output with an RC filter to give a stable
analog representation of the current or power. Some
of the DI source resistance of this filter is internal to
the IR3721 and specified in the electrical
specifications table. Add twenty thousand to fifty
thousand additional ohms externally to minimize
resistance variation. As the DI source resistance
increases beyond these guidelines, the voltage
measurement error caused by non-ideal voltmeter
conductance will increase.
Select a filter capacitor that limits 512 kHz sampling
frequency ripple to an acceptable value. Sampling
frequency ripple will appear as an error, but can be
reduced 20 dB for each decade that the filter corner
frequency is below 512 kHz. Select a capacitor value
that achieves the desired balance between low
sampling frequency ripple and adequate bandwidth.
Resistor current sensing
For resistor current sensing select a precision resistor
for R T inside the R T resistance range limits specified
in the Electrical Specifications table, such as 25.5k ?
and 1% tolerance.
Next, select a shunt resistor that will provide the most
current sensing voltage while also considering the
allowable power dissipation limitations. The DI output
will saturate to the VK voltage when full scale current
I FS flows through this shunt. Recommended
maximum current sensing voltage range is 5 to 150
mV. Maximum sensing voltages less than 5 mV will
cause comparator input offset voltage errors to
dominate, and voltages larger than 150 mV will cause
26.1 k ? , 1%
2.00 k ? , 1%
15.0 k ? , 1%
Murata Thermistor
NCP15WB473F03RC
47 k ? , 1%
Figure 5 R T network
The resistance of the network above at 25°C, R T (25),
is 37.58k ? . Over temperature R T (T) is multiplied by
copper resistance, DCR(25) ? (1+(T-25) ? 0.0039),
divided by (DCR(25) ? ( R T (25)) to normalize the
results, and plotted as nominal error in Figure 6.
5%
4%
3%
2%
1%
0%
-1%
-2%
comparator leakage current, I CS , errors to dominate.
Select R CS2 to be the next higher standard value
resistor from (R SHUNT ? I FS ? R T ) / V RT in order to
accommodate full scale current I FS .
Bypass VCS to VO with capacitor C CS2 . The value of
this capacitor limits the bandwidth, but is required
because it is the integrator of the delta sigma
-3%
-4%
-5%
0 20 40 60 80
Temperature [°C]
Figure 6 Nominal error vs. Temperature
100
modulator. Consider selecting the value of C CS2 to
place a filter corner frequency at 5 kHz, which will
reduce sampling ripple by 40 dB.
DCR current sensing
Select an R T network resistance between 20k ? and
45.3k ? . Consider the R T network of Figure 5 for DCR
current sensing.
Note that the error due to temperature compensation
at 25°C is zero, assuming ideal R T components. At
other temperatures the results are over or under
reported by the factor in percent indicated.
Proceed to calculate R SUM , defined as the sum of
R CS1 plus R CS2 , as follows.
R SUM =I FS ? DCR(25) ? R T (25) / V RT
Again, I FS is full scale current and V RT is the reference
voltage establishing the current in R T .
Estimate the capacitance C CS1 with the following
equation.
Page 9 of 16
www.irf.com
09/15/08
相关PDF资料 |
PDF描述 |
|---|---|
| IR3725MTRPBF | IC PWR MONITOR INPUT 12-DFN |
| IR3800AMTRPBF | IC REG BUCK SYNC ADJ 14A 15QFN |
| IR3800MTR1PBF | IC REG BUCK SYNC ADJ 12A QFN |
| IR3801AMTRPBF | IC REG BUCK SYNC ADJ 9A 15QFN |
| IR3801MTR1PBF | IC REG BUCK SYNC ADJ 7A QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3725 | 制造商:IRF 制造商全称:International Rectifier 功能描述:INPUT POWER MONITOR WITH DIGITAL INTERFACE |
| IR3725_11 | 制造商:IRF 制造商全称:International Rectifier 功能描述:INPUT POWER MONITOR WITH DIGITAL INTERFACE |
| IR3725MPBF | 制造商:International Rectifier 功能描述:Power Monitor 12-Pin DFN EP 制造商:International Rectifier 功能描述:IR3725 Series 3.9 V 1126 kHz Input Power Monitor with Digital Interface - DFN-12 |
| IR3725MTRPBF | 功能描述:电流和电力监控器、调节器 INPUT PWR MONITOR IC 12V Rail 3.1 VDD 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 |
| IR3741 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
发布紧急采购，3分钟左右您将得到回复。