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TLC5944_1 Datasheet, PDF (26/34 Pages) Texas Instruments – 16-Channel, 12-Bit PWM LED Driver with 6-Bit Dot Correction and Pre-Charge FET | |||
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TLC5944
SBVS112 â 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
PD = (VCC ´ ICC) +
VOUT
´
I
OLCMax
´
N
´
63d
´ dPWM
(4)
Where:
⢠VCC = device supply voltage
⢠ICC = device supply current
⢠VOUT = OUTn voltage when driving LED current
⢠IMAX = LED current adjusted by RIREF resistor
⢠DCn = maximum DC value for OUTn
⢠N = number of OUTn driving LED at the same time
⢠dPWM = duty ratio defined by BLANK pin or GS PWM value
26
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