欢迎访问ic37.com |
会员登录 免费注册
发布采购

ZXCT1109 参数 Datasheet PDF下载

ZXCT1109图片预览
型号: ZXCT1109
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗高边电流监测器 [LOW POWER HIGH-SIDE CURRENT MONITORS]
分类和应用: 监视器
文件页数/大小: 17 页 / 367 K
品牌: DIODES [ DIODES INCORPORATED ]
 浏览型号ZXCT1109的Datasheet PDF文件第9页浏览型号ZXCT1109的Datasheet PDF文件第10页浏览型号ZXCT1109的Datasheet PDF文件第11页浏览型号ZXCT1109的Datasheet PDF文件第12页浏览型号ZXCT1109的Datasheet PDF文件第14页浏览型号ZXCT1109的Datasheet PDF文件第15页浏览型号ZXCT1109的Datasheet PDF文件第16页浏览型号ZXCT1109的Datasheet PDF文件第17页  
A Product Line of  
Diodes Incorporated  
ZXCT1107/1109/1110  
LOW POWER HIGH-SIDE CURRENT MONITORS  
Application Information (cont.)  
Alternatively, the ZXCT1110 may be used with a reduced sense voltage if desired. From Equation 3, with ε=4%,  
0.082  
VSENSE  
=
= 0.082/(4-1.8) = 37.2mV  
ε 1.8  
Equation 4 gives  
RSENSE = 37.2mV/2A = 18.6mΩ  
A suitable preferred value is 20m. Then the sense voltage will be 2A * 20m= 40mV.  
Equation 5 gives  
2
RGAIN  
=
= 12500ꢀ  
0.004 * 0.04  
A suitable preferred value is 13k.  
The alternative example circuit using the ZXCT1110 with a sense voltage of 40mV is shown in Figure 3, giving the required  
overall accuracy of ±6%.  
20m  
ILOAD  
VSUPPLY  
S+  
S-  
ZXCT1110  
LOAD  
GND  
OUT  
OUTPUT  
VOUT  
13k  
GND  
Figure 3. Example Circuit using ZXCT1110  
Protection Against Load Short Circuit  
In the event of a load short circuit or overload, a large proportion of the supply voltage may appear between the sense  
terminals. The supply may be current limited, but there is normally a large reservoir capacitor which can deliver enough  
energy to damage the ZXCT11xx before the supply voltage falls to a safe level due to current limit activation.  
The ZXCT11xx is rated for a maximum sense voltage of +0.8V, but is safe if the input current is limited to ±8.5mA. In Figure  
4, the resistor RPROT limits the current and therefore protects the current monitor device against load short circuit without  
introducing significant current measurement error.  
13 of 17  
www.diodes.com  
MARCH 2011  
© Diodes Incorporated  
ZXCT1107/1109/1110  
Document number: DS35033 Rev. 1 - 2  
 复制成功!