Patent attributes
A DC-DC converter with a programmable pulse time limit. A charge pulse begins when the output voltage reaches a minimum threshold and terminates in response to a discharge indication, in which charge current flows through an inductive element while the charge pulse is provided. The discharge indication is provided to initiate a discharge pulse when the charge current reaches a peak threshold, which terminates in response to a reset indication. Current is discharged from the inductive element during the discharge pulse. A zero crossing detector provides the reset indication when the discharge current reaches a minimum level. A programmable timing circuit limits a duration of either one or both of the charge pulse and the discharge pulse to prevent hangup or excessive output voltage ripple. The DC-DC converter may include a memory that stores a digital value used to program the programmed time duration of the programmable timing circuit.
