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ZXCT1012
REDUCED HEIGHT MICRO-POWER CURRENT MONITOR
 
ZXCT1012  
Document number: DS33444 Rev. 2 - 2 
7 of 9
www.diodes.com
September 2011
?Diodes Incorporated 
 
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
A
), according to the
expression:
 
P
MAX
 = (T
JMAX
  T
A
) / ?/DIV>
JA
 
 
The device power dissipation, P
D
 is given by the expression:
 
P
D
= I
OUT
.(V
IN
-V
OUT
) watts
 
Care must be taken when using this device at large input voltages and large sense voltages to prevent too much power
dissipation.
 
0
100
200
300
400
500
600
T , AMBIENT TEMPERATURE ( C)
A
?/DIV>
0
25
50
75
100
125
150
 
 
 
V
IN
 = 20V V
SENSE
 = 2.5V
 
R
OUT
 = 100&
 
I
OUT
 = 2.5 x 0.01
  = 25mA
 
V
OUT
  = I
OUT
 x R
OUT
 
  = 25mA x 100&
  = 2.5V
 
 P
D
 = 25mA (20 - 2.5)V
  = 438mW 
 
 
 
 
 
 
 
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