TLC5926_15 Datasheet, PDF (23/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Drivers

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TLC5926, TLC5927
SLVS677C – JULY 2008 – REVISED OCTOBER 2015
T_J = T_A + θ_JA × P_{D_TOT} = 115°C + 40°C/W × 0.565 W = 137.6°C
(19)
This design example has demonstrated 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
150
Temperature = 25°C
125
I_O = 120 mA
I_O = 100 mA
100
I_O = 80 mA
75
I_O = 60 mA
50
I_O = 40 mA
25
I_O = 20 mA
I_O = 5 mA
0
0
0.5
1
1.5
2
2.5
3
V_O – Output Voltage – V
Figure 18. Output Current vs Output Voltage
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