LOWER LIMIT VALUE SETTING CIRCUIT, VARIABLE DELAY CIRCUIT EMPLOYING THE SAME, SWITCH DRIVING CIRCUIT, SWITCHING POWER SUPPLY DEVICE AND MOTOR DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent an extremely short simultaneous OFF time from being set.SOLUTION: A lower limit value setting circuit 11 comprises: a determination uni 11a which determines whether a setting value of a first delay amount setting signal DSET1 to be inputted is greater than a predetermined lower limit value and generates a determination signal Sdet; a storage unit 11b for storing a second delay amount setting signal DSET2 of which the setting value is fixed to the lower limit value; and a signal selection unit 11c which outputs one of the first delay amount setting signal DSET1 and the second delay amount setting signal DSET2 to a delay part 12 as a final delay amount setting signal DSET in accordance with the determination signal Sdet.SELECTED DRAWING: Figure 1