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NSI45035JZ, NSV45035JZ
http://onsemi.com
4
Figure 7. Power Dissipation vs. Ambient
Temperature @ T
J
 = 1505C
T
A
, AMBIENT TEMPERATURE (癈)
80
60
20
0
20
40
700
900
1300
1500
40
500 mm
2
/2 oz
500 mm
2
/1 oz
300 mm
2
/1 oz
1100
1700
500
100 mm
2
/1 oz
300 mm
2
/2 oz
1900
2100
2300
100 mm
2
/2 oz
APPLICATIONS INFORMATION
The CCR is a self biased transistor designed to regulate the
current through itself and any devices in series with it. The
device has a slight negative temperature coefficient, as
shown in Figure 2  Tri Temp. (i.e. if the temperature
increases the current will decrease). This negative
temperature coefficient will protect the LEDS by reducing
the current as temperature rises.
The CCR turns on immediately and is typically at 20% of
regulation with only 0.5 V across it.
The device is capable of handling voltage for short
durations of up to 45 V so long as the die temperature does
not exceed 150癈. The determination will depend on the
thermal pad it is mounted on, the ambient temperature, the
pulse duration, pulse shape and repetition.
Single LED String
The CCR can be placed in series with LEDs as a High Side
or a Low Side Driver. The number of the LEDs can vary
from one to an unlimited number. The designer needs to
calculate the maximum voltage across the CCR by taking the
maximum input voltage less the voltage across the LED
string (Figures 8 and 9).
Figure 8.
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