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參數(shù)資料
| 型號： | ZXCT1011E5TA |
| 廠商： | ZETEX PLC |
| 元件分類： | 電源管理 |
| 英文描述： | High-side low drift current monitor |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 289K |
| 代理商： | ZXCT1011E5TA |
www.zetex.com
A 1 ampere load current is to be measured into a battery. The output signal required to an over
current controller needs to be 3.3V. What is a suitable value of R
out
and what will the error due
to the supply current be
V
in
= 5.0V - 9.0V
I
load
= 1.0A
Output signal required: 3.3V
Figure 1
ZXCT1011 to measure a 1.0 A load current
To obtain the highest accuracy, choose the of R
sense
to give 100mV:
R
sense
= 0.1/1.0 = 0.1
The transconductance using a 120 resistor will be 10mA/V.
Choose R
out
to give V
out
= 3.3V, when V
sense
= 100mV
Rearranging equation 1 without the offset error gives:
R
out
= (V
out
x R
shunt
) / (1.2 x I
Load
x R
sense
)
R
out
= 3.3k
Now consider the offset error for this resistor:
Offset due to supply current = R
out
x 4x10
-6
μA = 13.2mV = 0.4%
V
sense+
ZXCT
1011
I
out
sense-
V
V
in
R
sense
I
load
= 1A
2
5
4
R
R
shunt
3
out
R
load
R
shunt
120R
3.3V
= 5.0V - 9.0V
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