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Hi
见datasheet 第十一页描述: http://www.ti.com.cn/cn/lit/ds/symlink/tps92661-q1.pdf
The TPS92661 device provides 10-bit PWM dimming of each individual LED. The LED turn-on and turn-off times are separately programmed for each LED. The LEDxON registers and LEDxOFF registers (where x = 1 to 12) determine the LED turn-on and turn-off times, respectively, within the PWM dimming period. Phase shifting can be accomplished by staggering the LEDxON times or LEDxOFF times. The 10-bit internal PWM Period Counter (TCNT) is compared against the LEDxON and LEDxOFF values.