TLC59116-Q1 Datasheet, PDF (34/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Driver

TLC59116-Q1
SLDS223A – MARCH 2016 – REVISED MARCH 2016
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12.3 Thermal Considerations
The maximum IC junction temperature should be restricted to 150°C under normal operating conditions. To
calculate the maximum allowable dissipation, P_D(max) for a given ambient temperature, use Equation 9 as a
guideline:
P_D(max)
=
T_J(max) - T_A
θ_JA
where
• P_D(max) = maximum allowable power dissipation
• T_J(max) = maximum allowable junction temperature (150°C for the TLC59116-Q1)
• T_A = ambient temperature of the device
• Θ_JA = junction to air thermal impedance.
(9)
See Thermal Information section. This parameter is highly dependent upon board layout.
Power dissipation in the device is determined by the LED current and the voltage at the OUTx pins. For example,
if the LED current is 50 mA continuous through each channel and the output voltage is 1 V on each channel,
then the total power dissipation is 50 mA × 1 V × 16 ch = 0.8 W.
34
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