Tool/software:
Hi Sir
My customer wants to use FPWM mode instead of PFM
1. For the selection requirements of Csync, Rent and Renb, in addition to the following description in the datasheet, are there any other selection requirements for capacitor Csync?
Dataaheet:
It is recommended to keep the parallel combination value of RENT and RENB in the 100-kΩ range. RENT is required for synchronization, but RENB can be left unmounted.
A 3.3-V or higher amplitude pulse signal coupled through a 1-nF capacitor, CSYNC, is suggested.
2. Regarding the power-on and power-off timing requirements, the datasheet only states that the clock signal comes after the EN enable when powering on. Do I need to disconnect the clock signal before turning off the enable when powering off? What are the consequences of turning off the enable directly?
Datasheet: The external clock must be off before start-up to allow proper start-up sequencing.
Thanks,
Yoga Zhang