REDUCED SLEEP CURRENT IN POWER CONVERTERS

摘要

A low standby power DC-DC converter can be powered down during standby mode. The DC-DC converter can be periodically awakened between sleep cycles to check if the output voltage needs to be recharged (refreshed). The duration of the sleep cycles can be varied to accommodate for changing load conditions that would affect the output voltage.

主权项

1. A method in a power supply circuit comprising:
operating the power supply circuit to convert an input voltage at a first voltage level to an output voltage at a second voltage level; (i) activating a sleep cycle in the power supply circuit by disabling operation of the power supply for a duration of time; (ii) at expiration of the duration of time, restoring the output voltage to the second voltage level by enabling operation of the power supply, but only when a difference between the output voltage and a reference voltage exceeds a predetermined voltage level; (iii) selectively altering the duration of time during which the power supply is disabled by increasing or decreasing the duration of time; and repeating (i) through (iii).