Current Driver Circuit

摘要

A current driver circuit includes a converter part having a switching element and converting an input voltage into an output voltage; a current detector which generates a detection signal indicative of the current of the switching element; an input voltage compensating circuit which generates a compensation signal corresponding to the input voltage; a comparator which compares the detection signal and the compensation signal against each other; and a switch driver circuit which generates a drive signal. The drive signal turns the switching element off in accordance with an output of the comparator, and turns the switching element on again after a lapse of a prescribed time from the switching element being turned off.

主权项

1. A current driver circuit, comprising:
an input terminal inputting a direct current voltage;a converter part, which has a switching element, converting direct current voltage into an output voltage and supplying a current to a load;
a current detector which generates a detection signal indicating a current of the switching element; an input voltage compensating circuit which inputs the direct current voltage and generates a compensation signal corresponding to the input voltage; a comparator which compares the detection signal with the compensation signal; and a switch driver circuit which generates a drive signal, the drive signal turning the switching element off in accordance with an output of the comparator, and turning the switching element on after a lapse of a prescribed time from the switching element being turned off,wherein:
the converter part is a boost converter, and the input voltage compensating circuit is configured to generate the compensation signal that becomes lower as the input voltage becomes higher.