TLC5904

LED DRIVER

SLLS391 – NOVEMBER 1999

20

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

power rating – free-air temperature

2.4

4.7

TA – Free–Air Temperature – °C

0

25

85

–20

1.48

3.2

0

0

† 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