Where
· T_onn is the time that OUTn turns on and sinks current
· GSn is OUTn's programmed grayscale PWM value between 0 and 4095
· ton_err is the Output on time error defined in the Switching Characteristics Table
When using Equation 10 with very high GSCLK frequencies and very low grayscale PWM values, the resulting
T_on time may be negative. If T_on is negative, the output does not turn on. For example, using f(GSCLK) = 30
MHz, GSn = 1, and the typical ton_err = 50 nS, Equation 10 calculates that OUTn turns on for –16.6 nS. This
output may not turn on under these conditions. Increasing the PWM value or reducing the GSCLK clock
frequency ensures turn-on. |
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