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参数资料
| 型号： | IR3720MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 10/20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 |
INDUCTOR DCR CURRENT SENSING APPLICATION
Referring to the Functional Description Diagram, it
4 ? L
DCR ? R SUM
can be seen that the shunt function can be
accomplished by the DC resistance of the inductor
that is already present. Omitting the resistive shunt
reduces BOM cost and increases efficiency. In
exchange for these two significant advantages two
easily compensated design complications are
introduced, a time constant and a temperature
coefficient.
The inductor voltage sensed between the Rcs1
resistors is not simply proportional to the inductor
Select a standard value C CS1 that is larger than
. Solve for R eq .
We now know Req and Rsum, but we do not know
the individual resistor values R CS1 or R CS2 . The next
step is to solve for them simultaneously. By
substituting R sum into the R eq equation the following
can be written:
current, but rather is expressed in the Laplace
equation below.
R eq =
R CS1 ? R CS2
R sum
, which can then be rearranged to
V L = Ι L ? DCR ? 1 + s
?
R CS1 ? R CS1 ? R sum + R eq ? R sum = 0 .
?
?
L ?
DCR ?
2
This inductor time constant is canceled when
Note that this equation is of the form
ax 2 + bx + c = 0 where a=0, b=-Rsum, and
L
DCR
=
R CS1 ? R CS2
R CS1 + R CS2
? C CS1 .
c=Req?Rsum. The roots of this quadratic equation
will be R CS1 and R CS2 . Use the higher value resistor
as R CS1 in order to minimize ripple current in C CS1 .
= R eq .
R CS1 ? R CS2
( R CS1 + R CS2 ) . Let
= IG ?
I FS
Let
R CS1 + R CS2
A second equation is used to set the full scale
inductor current.
V
R T DCR
R CS1 + R CS2 = R sum and solve for Rsum.
Page 10 of 20
www.irf.com
R CS1 = R SUM ?
and
R CS1 = R SUM ?
1 + 1 ? 4 ?
2
1 ? 1 ? 4 ?
2
R eq
R SUM
R eq
R SUM
09/09/08
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相关代理商/技术参数 |
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|---|---|
| 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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