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參數資料
| 型號： | ZXCT1030X8TA |
| 廠商： | Diodes Inc |
| 文件頁數： | 5/7頁 |
| 文件大小： | 113K |
| 描述： | IC MONITOR CURRENT HI SIDE 8MSOP |
| 產品變化通告： | Product Obsolescence 11/Mar/2011 |
| 標準包裝： | 1 |
| 功能： | 電流監控器 |
| 檢測方法： | 高端 |
| 精確度： | ±3% |
| 輸入電壓： | 2.2 V ~ 20 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | ZXCT1030X8TACT |
ZXCT1030
ZXCT1030
Document number: DS32161 Rev. 4 - 2
5 of 7
www.diodes.com
June 2010
?Diodes Incorporated
Product Line of
Diodes Incorporated
Voltage output current monitor
Referring to the block diagram, the current monitor takes the small voltage developed across the sense resistor (V
SENSE
)
and transfers it from the large common mode supply voltage to a ground referenced signal with a gain of 10. The sense
input common mode range is 2.2V to 20V. In this range, a linear output voltage is delivered.
Reference
The bandgap reference allows the comparator to compare the translated V
SENSE
with threshold value chosen by the user
which can be any voltage from 0 to 1.24V, configured by two external resistors which forms V
COMP
_
IN
.
The output current which can be drawn from the comparator reference (I
REF
source) is limited to 5糀, making
potentiometers e250k& suitable for setting a threshold level. Where a lower potentiometer resistor value is used, an
additional resistor value should be inserted between V
REF
and V
CC
to maintain sufficient current for the reference.
(as shown in Figure 1).
Figure 1: External Resistor for Reference Level
The voltage reference has a maximum current sink capability. This magnitude of current will be influenced by the value of
R1 which is inserted between V
REF
and V
CC
. The value of current flowing through R1 can be expressed as:
I = (V
CC
-V
REF
) / R1
Comparator
The open collector output is active low and is asserted when V
SENSE
x 10 (V
OUT
) > V
COMP
_
IN
. It can be connected to any
voltage rail up to V
IN
via a pull-up resistor. Suggest values for the resistor are in the range of 10-100k&.
In the case where high load currents or a short circuit occurs, thus reducing the common mode signals (V+, V-) typically
below 2.2V, the comparator will default to the asserted state. This can eliminate a closed loop system 'latch-up' condition,
allowing the controller to remove the applied power.
Stability
To ensure stable operation of the ZXCT1030, it is recommended a decoupling capacitor is placed across the V
CC
and
ground connections. A ceramic 10礔 will be adequate.
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