TLC5940_15 Datasheet, PDF (26/38 Pages) Texas Instruments – 16-Channel LED Driver

TLC5940
SLVS515D – DECEMBER 2004 – REVISED NOVEMBER 2015
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11.3 Power Dissipation Calculation
The device power dissipation must be below the power dissipation rating of the device package to ensure correct
operation. Equation 10 calculates the power dissipation of device.
( ) ( ) ^P_D ^{= V}_CC ^{x I}_CC
+
V_OUT x I_MAX x
DCn
63
x d_PWM
xN
where
• V_CC: device supply voltage
• I_CC: device supply current
• V_OUT: TLC5940 OUTn voltage when driving LED current
• I_MAX: LED current adjusted by R_(IREF) Resistor
• DC_n: maximum dot correction value for OUTn
• N: number of OUTn driving LED at the same time
• d_PWM: duty cycle defined by BLANK pin or GS PWM value
(10)
26
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