Diodes ZXCT1012 - Manual (Page 7)

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 ( θ
JA
), maximum junction temperature (T
JMAX
), and ambient temperature (T
A
), according to the
expression:
P
MAX
= (T
JMAX
– T
A
) / θ
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
°
0 25 50 75 100 125 150
V
IN
= 20V V
SENSE
= 2.5V
R
OUT
= 100 Ω
I
OUT
= 2.5 x 0.01
= 25mA
V
OUT
= I
OUT
x R
OUT
= 25mA x 100 Ω
= 2.5V
׵ P
D
= 25mA (20 - 2.5)V
= 438mW