The current limit can be an input current limit of the DC-DC converter or an output current limit of the DC-DC converter.

The current limit value calculator calculates the current limit value by multiplying the current limit basic value by the output gain together with the voltage gain.

In some embodiments, both the current limit detector and the current limit controller circuitry include scaled current switches.

A comparator (6) compares motor current with the current limit and switches off the drive circuit (2) if the current limit is exceeded.

Then, when the current sensed using the first current sensor exceeds a predetermined high-current threshold, the apparatus limits the current drawn from the adapter to a first predetermined current limit.

A motor current command is limited to at least one of a positive current limit or a negative current limit, the positive and negative current limits being a function of motor velocity.

The current limit value is automatically adjusted as a function of average regulator current.

The scaling may be substantially similar between the programmed-current limit detector and the current limit controller circuitry.

The power manager has a current limit feedback control loop that limits the drawn current in accordance with a predetermined output current rating of the external power supply.

The current limit threshold of the switch is changed as a function of the shunt regulator current.

The measured current enables determination of a current limit set point for the integrated circuit.

The feedback current is a fraction of the consumption current of the regulator circuit and the current limit threshold of the switch is changed as a function of the feedback current.

The count N is reset to zero if the current in the power converter does not exceed the current limit substantially during the minimum on time of the power switch.

A current limiting unit (10) is provided which limits the current flowing in switching elements (Su, Sv, Sw, Sx, Sy and Sz) so as not to exceed a prescribed current limit value (Imax).

The current adjustment function varies a current limit applied to the current driver (320) in response to a variation in the load impedance.