TLC5904 Datasheet, PDF (20/27 Pages) Texas Instruments – LED DRIVER

TLC5904
LED DRIVER
SLLS391 – NOVEMBER 1999
PRINCIPLES OF OPERATION
power rating – free-air temperature
4.7
3.2
2.4
1.48
0
0
–20 0
25
85
TA – Free–Air Temperature – °C
† _{VCCLOG=VCCANA=VCCLED=5.0V, IOLC = 80 mA, ICC is typical value.}
NOTES: A. IC is mounted on PCB. PCB size: 102 x 76 × 1.6 [mm3], four layers with the internal two layer being plane. The thermal pad is soldered
to the PCB pattern of 10 × 10 [mm2]. For operation above 25°C free-air temperature, derate linearly at the rate of 38.2 mW/°C.
B. The thermal impedance will be varied depending on mounting conditions. Since the PZP package established low thermal
impedance by radiating heat from the thermal pad, the thermal pad should be soldered to the pattern with low a thermal impedance.
C. Consider thermal characteristics when selecting the material for the PCB, since the temperature will rise around the thermal pad.
Figure 7. Power Rating
20
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