The TPS62812 has Optional Spread Spectrum Clocking function, but in page3 5 Device Comparison Table, all FEATURES spread spectrum clocking is OFF.
When the device is externally synchronized by applying a clock signal to the MODE/SYNC pin, TPS6281x-Q1 follows the external clock and the internal spread spectrum block is turned off
If i no sync with externally clock, The Spread Spectrum Clocking is enable?