DC-DC power converter with improved output current resolution

A DC-DC power converter comprising:

• a primary side circuit comprising a positive input terminal and a negative input terminal for receipt of a DC input voltage,
• a secondary side circuit comprising a positive output terminal and a negative output terminal for supply of a load current to a load,
• a switched converter core operated in accordance with a primary control signal to supply a primary DC output current (Io) of the converter, said primary control signal exhibiting a minimum resolution leading to a corresponding minimum current step of the primary DC output current, and
• a controllable resistive path or a controllable current source, wherein the controllable resistive path or the controllable current source is connected between a pair of terminals selected from the group of:
• the positive output terminal, the negative output terminal, the positive input terminal, and the negative input terminal, and wherein the controllable resistive path or the controllable current source is configured to add or subtract a secondary DC output current (Icon) to the primary DC output current (Io) in accordance with a secondary control signal to adjust the load current (Iload),
• wherein a minimum current step of the secondary DC output current (Icon) is between 4 and 65536 times smaller than the minimum current step of the primary DC output current (Io).