STEP-DOWN SWITCHING REGULATOR, ITS CONTROL CIRCUIT, AND ELECTRONIC APPARATUS EMPLOYING IT

STEP-DOWN SWITCHING REGULATOR, ITS CONTROL CIRCUIT, AND ELECTRONIC APPARATUS EMPLOYING IT

PROBLEM TO BE SOLVED: To provide a step-down switching regulator in which conversion efficiency is improved under a light load. SOLUTION: The control circuit 100 of a step-down switching regulator applies a switching voltage Vsw to an inductor L1. A driver circuit 10 creates first and second gate vo...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: TAMAGAWA TAKEMOTO, YAMAMOTO ISAO
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 provide a step-down switching regulator in which conversion efficiency is improved under a light load. SOLUTION: The control circuit 100 of a step-down switching regulator applies a switching voltage Vsw to an inductor L1. A driver circuit 10 creates first and second gate voltages Vg1 and Vg2 which are applied to the gate terminal of each transistor based on a PWM signal Vpwm. A comparing section 30 outputs a high level comparison signal Vcmp when Vsw>0 V. During a period where a transistor M2 for synchronous rectification must be turned on, a latch circuit 40 latches the comparison signal Vcmp and outputs it as a detection signal Vsens. During a period where the detection signal Vsens is latched to high level, a forced off switch SW1 fixes the gate voltage of the transistor M2 for synchronous rectification to 0 V. COPYRIGHT: (C)2007,JPO&INPIT