The RVCC capacitor needs to be at least 5 times greater than boot capacitor. In addition, sizing of the RVCC capacitor depends on the stability of the RVCC LDO. If the load is light on RVCC, smaller capacitors can be used. The larger the load, the larger the capacitor is needed. In a typical system, the RVCC LDO powers the PFC and LLC gate drivers.