JAJSJC6A December 2021 – June 2022 TPS92623-Q1
The pulse width modulation (PWM) input of the TPS92623-Q1 functions as enable for the output current. When the voltage applied on the PWM pin is higher than VIH(PWM), the relevant output current is enabled. When the voltage applied on PWM pin is lower than VIL(PWM), the output current is disabled as well as the diagnostic features. Besides output current enable and disable function, the PWM input of TPS92623-Q1 also supports adjustment of the average current output for brightness control if the frequency of applied PWM signal is higher than 100 Hz, which is out of visible frequency range of human eyes. TI recommends a 200-Hz PWM signal with 1% to 100% duty cycle input for brightness control. Please refer to Figure 8-4 for typical PWM dimming application.
The TPS92623-Q1 device has three PWM input pins: PWM1, PWM2, and PWM3 to control each of current output channel independently. PWM1 input controls the output channel1 for both OUT1 and RES1, PWM2 input controls the output channel2 for both OUT2 and RES2, and PWM3 input controls the output channel3 for both OUT3 and RES3. Figure 7-1 illustrates the timing for PWM input and current output.