ZXCT1030X8TA Diodes Zetex, ZXCT1030X8TA Datasheet - Page 5

• Manufacturer Part Number: ZXCT1030X8TA
• Description: IC MONITOR CURRENT HI SIDE 8MSOP
• Manufacturer: Diodes Zetex

Specifications of ZXCT1030X8TA

• Function: Current Monitor
• Sensing Method: High-Side
• Accuracy: ±3%
• Voltage - Input: 2.2 ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Other names: ZXCT1030X8TATR

Voltage output current monitor
Referring to the block diagram, the current monitor takes the small voltage developed across the sense resistor (V
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
which can be any voltage from 0 to 1.24V, configured by two external resistors which forms V
The output current which can be drawn from the comparator reference (I
potentiometers ≥250kΩ suitable for setting a threshold level. Where a lower potentiometer resistor value is used, an
additional resistor value should be inserted between V
(as shown in Figure 1).
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
I = (V
Comparator
The open collector output is active low and is asserted when V
voltage rail up to V
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
ground connections. A ceramic 10µF will be adequate.
ZXCT1030
Document number: DS32161 Rev. 4 - 2
CC
-V
REF
) / R1
IN
via a pull-up resistor. Suggest values for the resistor are in the range of 10-100kΩ.
REF
and V
Figure 1: External Resistor for Reference Level
CC
. The value of current flowing through R1 can be expressed as:
www.diodes.com
REF
5 of 7
and V
SENSE
CC
x 10 (V
to maintain sufficient current for the reference.
SENSE
OUT
Diodes Incorporated
REF
) > V
with threshold value chosen by the user
A Product Line of
source) is limited to 5μA, making
COMP
_
COMP
IN
. It can be connected to any
_
IN
.
© Diodes Incorporated
ZXCT1030
June 2010
CC
SENSE
and
)