0
25
50
75
100
125
150
0
0.5
1
1.5
2
2.5
3
Output Voltage (V)
O
u
tp
u
t
C
u
rr
e
n
t
(m
A
)
Temperature = 25°C
I
O
= 80 mA
I
O
= 40 mA
I
O
= 20 mA
I
O
= 60 mA
I
O
= 5 mA
I
O
= 100 mA
I
O
= 120 mA
SLVS695D – JUNE 2007 – REVISED JANUARY 2015
This design example demonstrates how to calculate power dissipation in the IC and ensure that the junction
temperature is kept below 150°C.
NOTE
This design example assumes that all channels have the same electrical parameters
(n
LED
, I
O
, V
F
, V
LED
). If the parameters are unique for each channel, then the power
dissipation must be calculated for each current sink separately. Then, each result must be
added together to calculate the total power dissipation in the current sinks.
10.2.3 Application Curve
Figure 23. Output Current vs Output Voltage
26
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