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参数资料
| 型号： | IR3721MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 7/16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
TYPICAL 2-PHASE DCR SENSING APPLICATION
The IR3721 is capable of monitoring power in a
The duty ratio of DI is
multiphase converter. A Two Phase DCR Sensing
Circuit is shown below. The voltage output of any
phase is equal to that of any and every other phase
because they are electrically connected and
monitored at VO as before.
DI DUTYRATIO =
I CS ? R T
V REF
I L 1 ? DCR 1 ?
? DCR 2 ?
( R CS 2 || R CS 1 )
R CS 3 + ( R CS 2 || R CS 1 )
( I L 1 + I L 2 ) ? DCR 1
I CS =
( I L 1 + I L 2 ) ? DCR ? R T
( R CS 1 + 2 R CS 2 ) ? V R Τ
Output current is the sum of the two inductor currents
(I L1 + I L2 ). Superposition is used to derive the transfer
function for multiphase sensing. The voltage on R CS2
due to I L1 is
( R CS 2 || R CS 3 )
R CS 1 + ( R CS 2 || R CS 3 )
Likewise, the voltage on RCS2 due to IL2 is
I L 2
The current through R CS2 due to both inductor
currents is I CS . From the two equations above
If DCR1=DCR2, and RCS1=RCS3, then I CS can be
simplified to
R CS 1 + 2 R CS 2
and the DI duty ratio simplifies to
DI DUTYRATIO =
Full scale current occurs when DI duty ratio becomes
one.
I CS =
I L 1 DCR 1 R CS 3 + I L 2 DCR 2 R CS 1
R CS 1 R CS 2 + R CS 1 R CS 3 + R CS 2 R CS 3
Figure 3 Two Phase DCR Sensing Circuit
Page 7 of 16
www.irf.com
09/15/08
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| 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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| 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 |
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