TLC5921

LED DRIVER

SLLS390 – SEPTEMBER 1999

10

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

power rating – free-air temperature

2.0

3.9

TA – Free–Air Temperature – °C

0

25

85

–20

1.48

3.2

0

0

NOTES: A. The data is based on simulation result. When TI recommended print circuit board is used, derate linearly at the rate of 31.4 mW/

°C

for operation above 25

°C free-air temperature. VCC=5 V, IO(LC) = 80 mA, ICC is typical value.

B. The thermal impedance will be varied depend on mounting conditions. Since PZP package established low thermal impedance by

radiating heat from thermal pad, the thermal pad should be soldered to pattern with low thermal impedance.

C. The material for PCB should be selected considering the thermal characteristics since the temperature will rise around the thermal

pad.

Figure 4. Power Rating