DC/DC CONVERTER AND SEMICONDUCTOR DEVICE

PROBLEM TO BE SOLVED: To suppress the drop of an output voltage even when an input voltage is comparatively low or a load current is comparatively large.SOLUTION: A switching element n_dr switches according to an on-signal Son and an off-signal Soff generated by a control circuit PG of a DC/DC conve...

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1. Verfasser:	NAKASE YASUNOBU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To suppress the drop of an output voltage even when an input voltage is comparatively low or a load current is comparatively large.SOLUTION: A switching element n_dr switches according to an on-signal Son and an off-signal Soff generated by a control circuit PG of a DC/DC converter 1. The control circuit PG generates a first control voltage Von which gradually increases from the deactivation of the off-signal Soff and a second control voltage Voff which gradually increases from the deactivation of the on-signal Son on the basis of an input DC voltage Vin. The control circuit PG deactivates the on-signal Son when the first control voltage Von exceeds a first reference voltage Vref2 and deactivates the off-signal Soff when the second control voltage Voff exceeds a second reference voltage Vref. The control circuit PG changes at least one of the first and the second reference voltages according to an output voltage DVout of a conversion circuit 10.