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ZXCT1009
HIGH-SIDE CURRENT MONITOR
 
ZXCT1009  
Document number: DS33441 Rev. 12 - 2 
4 of 8
www.diodes.com
April 2011
?Diodes Incorporated 
Typical Characteristics (cont.) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power Dissipation 
The maximum allowable power dissipation of the device for
normal operation (P
MAX
), is a function of the package junction to
ambient thermal resistance (?/DIV>
JA
), maximum junction temperature
(T
JMAX
), and ambient temperature (T
AMB
), according to the
expression:
 
P
MAX
 = (T
JMAX
  T
AMB
) / ?/DIV>
JA
 
 
The device power dissipation, P
D
 is given by the expression:
P
D
= I
OUT
(V
IN
 -V
OUT
) W
 
 
 
 
 
 
Application Information 
The following text describes 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
OUT
1
 
 
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&.
 
2) Choose R
OUT
 to give V
OUT
 = 100mV, when
V
SENSE
 = 100mV.
Rearranging
1
 for Rout gives: 
R
OUT
 = V
OUT
 /(V
SENSE
 x 0.01)
R
OUT
 = 0.1 / (0.1 x 0.01) = 100&
 
 
 
 
 
 
 
 
 
 
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