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参数资料
| 型号： | IR3725MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC PWR MONITOR INPUT 12-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： | 700µA |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN（4x3） |
| 包装： | 标准包装 |
| 其它名称： | IR3725MTRPBFDKR |
IR3725
Data Sheet
THERMAL COMPENSATION FOR INDUCTOR DCR CURRENT
SENSING
? ? ? ? 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 ) ? e
? ? ? ?
? 0 ? ?
(2)
function of temperature, is approximated by
DCR ( T ) ? DCR ( T R ) ? ( 1 ? ( T ? T R ) ? TCR Cu ) . (1)
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 1 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 in the R T network below.
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 2. 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 2 can never
compensate linear equation 1 at all temperatures, a
spreadsheet can be constructed to minimize error
over the temperature interval of interest. The
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 ?
(3)
Rp
Rth
using R th (T) from equation 2.
Equation 4 may be written as a function of
temperature using equations 1 and 3 as follows:
Figure 3 R T Network
I FS ? T ? ?
V IG
R T ? T ?
?
? R CS1 ? R CS 2 ? .
DCR ? T ?
(4)
If Rth is an NTC thermistor then the resistance of the
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
With Rs and Rp as additional free variables, use a
spreadsheet to solve equation 4 for the desired full
scale current while minimizing the I FS (T) variation
over temperature.
Page 11 of 19
www.irf.com
2013_12_09
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相关代理商/技术参数 |
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|---|---|
| IR3741 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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| IR3800AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:SupIRBuckTM |
| IR3800AMTR1PBF | 功能描述:直流/直流开关调节器 9999V 999.000A Supir 999.000A Supirbuck RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3800AMTRPBF | 功能描述:直流/直流开关调节器 14A SupIRBuck Reg 300kHz, 2.5-21V in RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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