If other frequencies are desired, within the frequency range of 200 kHz to 800 KHz, the RFREQ (R6) resistor value can be changed. Consult the data sheet for proper selection of the RFREQ resistor. Change the inductor (L1) and the total output capacitance for proper control-loop operation. The FREQ/SYNC pin can also be used to synchronize the internal oscillator to an external clock. The TPS25869EVMQ1-163 allows users to synchronize the internal oscillator to both Lo-Z clock source and Hi-Z clock source. See the data sheet for detailed information.