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ZXCT1008  
Document number: DS33441 Rev. 6 - 2 
4 of 8
www.diodes.com
January 2014
?Diodes Incorporated 
ZXCT1008
 Product Line of
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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