参数资料
型号: AUIPS7121RTRR
厂商: International Rectifier
文件页数: 7/13页
文件大小: 0K
描述: IC DVR CURRENT SENSE 1CH D2PAK-5
标准包装: 3,000
类型: 高端,电流感应
输入类型: 非反相
输出数: 1
导通状态电阻: 24 毫欧
电流 - 输出 / 通道: 3.8A
电流 - 峰值输出: 60A
电源电压: 3.5 V ~ 5.9 V
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: TO-252-5,DPak(4 引线 + 接片),TO-252AD
供应商设备封装: D-Pak
包装: 带卷 (TR)
AUIPS7121R
Current sensing accuracy
Ifb
Ifb2
Ifb1
Ifb leakage
I offset
Iout1
Iout2
Iout
The current sensing is specified by measuring 3 points :
- Ifb1 for Iout1
- Ifb2 for Iout2
- Ifb leakage for Iout=0
The parameters in the datasheet are computed with the following formula :
Ratio = ( Iout2 – Iout1 )/( Ifb2 – Ifb1)
I offset = Ifb1 x Ratio – Iout1
This allows the designer to evaluate the Ifb for any Iout value using :
Ifb = ( Iout + I offset ) / Ratio if Ifb > Ifb leakage
For some applications, a calibration is required. In that case , the accuracy of the system will depends on the variation of
the I offset and the ratio over the temperature range. The ratio variation is given by Ratio_TC specified in page 4.
The Ioffset variation depends directly on the Rdson :
I offset@-40°C= I offset@25°C / 0.8
I offset@150°C= I offset@25°C / 1.9
Maximum Vcc voltage with short circuit protection
The maximum Vcc voltage with short circuit is the maximum voltage for which the part is able to protect itself under test
conditions representative of the application. 2 kind of short circuits are considered : terminal and load short circuit.
L supply
R supply
Vcc
5μH
10mohm
IPS Out
Terminal SC
L SC
0.1 μH
R SC
10 mohm
www.irf.com
L SC
R SC
Load SC
10 μH
100 mohm
7
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