TLC5944 Datasheet, PDF (26/34 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction and Pre-Charge FET

TLC5944
SBVS112 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
POWER DISSIPATION CALCULATION
The device power dissipation must be below the power dissipation rate of the device package (illustrated in
Figure 18) to ensure correct operation. Equation 4 calculates the power dissipation of the device:
DCn
P_D = (V_CC ´ I_CC) +
V_OUT
´
I
OLCMax
´
N
´
63d
´ d_PWM
(4)
Where:
• V_CC = device supply voltage
• I_CC = device supply current
• V_OUT = OUTn voltage when driving LED current
• I_MAX = LED current adjusted by R_IREF resistor
• DCn = maximum DC value for OUTn
• N = number of OUTn driving LED at the same time
• d_PWM = duty ratio defined by BLANK pin or GS PWM value
26
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