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参数资料
| 型号： | IR3721MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 6/16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
THERMAL COMPENSATION FOR INDUCTOR DCR CURRENT
SENSING
? β
) ? e ?
1 ? ? ?
? 1
? T - T ? ?
The positive temperature coefficient of the inductor
DCR can be compensated if R T varies inversely
proportional to the DCR. DCR of a copper coil, as a
R th ( T ) = R th ( T 0
?
?
? ?
? 0 ? ?
function of temperature, is approximated by
DCR ( T ) = DCR ( T R ) ? ( 1 + ( T - T R ) ? TCR Cu )
Equation 2
T R is some reference temperature, usually 25 °C, and
TCR Cu is the resistive temperature coefficient of
copper, usually assumed to be 0.39 %/°C near room
temperature. Note that equation 2 is linearly
increasing with temperature and has an offset of
DCR(T R ) at the reference temperature.
If R T incorporates a negative temperature coefficient
thermistor then temperature effects of DCR can be
minimized. Consider a circuit of two resistors and a
thermistor as shown below.
Equation 3
where R th (T) is the thermistor resistance at some
temperature T, R th (T 0 ) is the thermistor resistance at
the reference temperature T 0 , and β is the material
constant provided by the thermistor manufacturer.
Kelvin degrees are used in the exponential term of
equation 3. If R S is large and R P is small, the
curvature of the equivalent network resistance can be
reduced from the curvature of the thermistor alone.
Although the exponential equation 3 can never
compensate linear equation 2 at all temperatures, a
spreadsheet can be constructed to minimize error
over the temperature interval of interest. The
equivalent resistance R T of the network shown as a
function of temperature is
Rs
R T ( T ) = R s +
1
R p
+
1
1
R th ( T )
Equation 4
Rp
Rth
using R th (T) from equation 3.
Equation 2 may be rewritten as a new function of
temperature using equations 2 and 4 as follows:
Figure 2 R T Network
If Rth is an NTC thermistor then the value of the
I FS ( T ) =
V R Τ
R T ( T )
?
( R CS1 + R CS 2 )
DCR ( T )
network will decrease as temperature increases.
Unfortunately, most thermistors exhibit far more
variation with temperature than copper wire. One
equation used to model thermistors is
Equation 5
With Rs and Rp as additional free variables, use a
spreadsheet to solve equation 5 for the desired full
scale current while minimizing the I FS (T) variation
over temperature.
Page 6 of 16
www.irf.com
09/15/08
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