參數(shù)資料
型號(hào): ZXCT1009T8
廠商: ZETEX PLC
元件分類(lèi): 電源管理
英文描述: HIGH-SIDE CURRENT MONITOR
中文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝: SOT-223, 8 PIN
文件頁(yè)數(shù): 5/8頁(yè)
文件大?。?/td> 216K
代理商: ZXCT1009T8
ISSUE 3 - APRIL 2001
ZXCT1009
5
The following lines describe how to scale a load
current to an output voltage.
V
sense
= V
in
- V
load
V
out
= 0.01 x V
sense
x R
out1
E.g.
A 1A current is to be represented by a 100mV output
voltage:
1)Choose the value of R
sense
to give 50mV > V
sense
>
500mV at full load.
For example V
sense
= 100mV at 1.0A. R
sense
= 0.1/1.0
=> 0.1 ohms.
2)Choose R
out
to give V
out
= 100mV, when V
sense
=
100mV.
Rearranging
1
for R
out
gives:
R
out
= V
out
/(V
sense
x 0.01)
R
out
= 0.1 / (0.1 x 0.01) = 100
V
in
Vin
Iout
Load
V
out
R
sense
R
load
R
out
ZXCT1009
TYPICAL CIRCUIT APPLICATION
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
(
θ
ja), maximum junction temperature (Tjmax), and
ambient temperature (Tamb), according to the
expression:
P
max
= (Tj
max
T
amb
) /
θ
ja
The device power dissipation, P
D
is given by the
expression:
P
D
=I
out
.(V
in
-V
out
) Watts
SM8
SOT23
Where R
load
represents any load including DC motors,
a charging battery or further circuitry that requires
monitoring, R
sense
can be selected on specific
requirements of accuracy, size and power rating.
APPLICATIONS INFORMATION
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