DD313-4 Datasheet, PDF (11/15 Pages) Silicon Touch Technology Inc. – LED open circuit detection

DD313-4
Power Dissipation Calculation
The device power dissipation must be lower than the power dissipation rate of the
device package material as illustrated in Figure 7 to ensure a correct operation. The
equation below calculates the power dissipation of a device.
Where:
V_CC = device supply voltage
I_CC = device supply current
V_OUT = IOUT voltage when driving LED current
I_MAX = LED current adjusted by REXT resistor
D_PWM = average duty ratio defined by scaled PWM duty
Figure 7. Power dissipation vs. temperature
40V Adjustable Current Sink Linear LED Driver
Version:PRE.002
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