ZXCT1009FTA Diodes Zetex, ZXCT1009FTA Datasheet - Page 5

• Manufacturer Part Number: ZXCT1009FTA
• Description: IC CURRENT MONITOR 1% SOT23-3
• Manufacturer: Diodes Zetex

Specifications of ZXCT1009FTA

• Function: Current Monitor
• Sensing Method: High-Side
• Accuracy: ±1%
• Voltage - Input: 2.5 ~ 20 V
• Current - Output: 10.2mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXCT1009FTR

ISSUE 10 - JULY 2007
POWER DISSIPATION
The maximum allowable power dissipation of the
device for normal operation (Pmax), is a function of
the package junction to ambient thermal resistance
( ja), maximum junction temperature (Tjmax), and
ambient temperature (Tamb), according to the
expression:
P
The device power dissipation, P
expression:
P
max
D
=I
out
= (Tj
.(V
in
max
-V
out
– T
) Watts
amb
) /
SOT23
SM8
ja
D
is given by the
5
APPLICATIONS INFORMATION
The following lines describe how to scale a load
current to an output voltage.
E.g.
A 1A current is to be represented by a 100mV output
voltage:
1)Choose the value of R
> 500mV at full load.
For example V
0.1/1.0 => 0.1 ohms.
2)Choose R
100mV.
Rearranging
R
R
TYPICAL CIRCUIT APPLICATION
Where R
a charging battery or further circuitry that requires
monitoring, R
requirements of accuracy, size and power rating.
out
out
= V
= 0.1 / (0.1 x 0.01) = 100
out
load
out
V
/(V
out
1
represents any load including DC motors,
for R
sense
to give V
sense
sense
V
= 0.01 x V
sense
out
x 0.01)
= 100mV at 1.0A. R
can be selected on specific
gives:
= V
sense
out
in
sense
= 100mV, when V
- V
to give 50mV > V
S E M I C O N D U C T O R S
load
x R
ZXCT1009
out
1
sense
sense
sense
=
=