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| 型号： | IR3721MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 5/16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
FUNCTIONAL DESCRIPTION
Please refer to the Functional Description Diagram
below. Power flow from the buck converter inductor is
the product of output voltage times the current I L
flowing through the inductor.
Power is measured with the aid of International
Rectifier’s proprietary TruePower? circuit. Current is
converted to a duty ratio that appears at the DI pin.
The duty ratio of the DI pin is
The amplitude of the DI pin is the voltage appearing
at pin VK. If a fixed voltage is applied to VK then the
output of the RC filter driven by DI will be proportional
to inductor current I L .
If VO is applied to V K as shown in the figure then the
output of the DI driven RC network will be
proportional to power. The full-scale voltage that can
be measured is established on the chip to be 1.8V.
I L ? DCR R T
DI DUTYRATIO =
?
( R CS 1 + R CS 2 ) V R Τ
The full scale power P FS that can be measured is the
product of full-scale voltage and full scale current.
Equation 1
The full-scale current that can be measured
corresponds to a duty ratio of one.
I L
Vin
L
DCR
VDD
VK
Vo
R CS1
C CS1
VO
C CS2
R CS2
VCS
IR3721
DI
Power
V RT
R T
GND
Figure 1 Functional Description Diagram
Page 5 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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