TPS929120-Q1: the dithering function of TPS929120

Hi,

I have some confues about the AN of TPS929120.

”Basically the PWM generator counts 256 pulses at base high frequency for PWM output cycle period and counts number of pulses determined by MSB 8 bits of 12-bit binary input at the same frequency for PWM ON period. The LSB 4 bits of 12-bit binary input is used to set up the dithering to realize total 12-bit resolution. ”

I have know there is a dithering function, but I don't know how to understand it?

It only counts  256 pulses. but how it can acheive 4096 steps as show below.

thank you for your attention.

Annie Liu：

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https://e2echina.ti.com/support/power-management/f/power-management-forum/213590/tps929120-q1-the-dithering-function-of-tps929120