What does externally adjustable output voltage mean?

LDO Linear RegulatorsDC/DC Switching RegulatorsHow to use

Nisshinbo Micro Devices’ DCDC converters have the output voltage types that are internally fixed or externally adjustable.
The internally fixed output voltage type has the VOUT pin and the externally adjustable output voltage type has the VFB pin.
Please pay attention to phase compensation and noise sneaking when selecting the components for the externally adjustable output voltage type.

• RP505Kxx1A/B
  (Internally Fixed Output Voltage Type)

  

• RP505K001C
  (Externally Adjustable Output Voltage Type)