STEP-DOWN CONVERTER AND CONTROLLER CIRCUIT THEREOF

To provide a controller of a step-down converter having a function of over-current protection.SOLUTION: A pulse modulator 210 generates a pulse modulation signal Sp so that an output voltage VOUT of a step-down converter 100 becomes closer to a prescribed target voltage VOUT(REF). A logical circuit...

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1. Verfasser:	FUKUMOTO YOSUKE
Format:	Patent
Sprache:	eng ; jpn
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:	To provide a controller of a step-down converter having a function of over-current protection.SOLUTION: A pulse modulator 210 generates a pulse modulation signal Sp so that an output voltage VOUT of a step-down converter 100 becomes closer to a prescribed target voltage VOUT(REF). A logical circuit 220 generates control signals SH and SL for a high-side transistor M1 and a low-side transistor M2 based on the pulse modulation signal Sp. An over-voltage detection circuit 230 detects an over-voltage state in which the output voltage VOUT of the step-down converter 100 is higher than a threshold voltage VOVP. The logical circuit 220 turns off the high-side transistor M1 and the low-side transistor M2 when the over-voltage state continuously takes a prescribed time.SELECTED DRAWING: Figure 1 【課題】過電流保護機能を有する降圧コンバータのコントローラを提供する。【解決手段】パルス変調器２１０は、降圧コンバータ１００の出力電圧ＶＯＵＴが所定の目標電圧ＶＯＵＴ（ＲＥＦ）に近づくようにパルス変調信号Ｓｐを生成する。ロジック回路２２０は、パルス変調信号ＳｐにもとづいてハイサイドトランジスタＭ１およびローサイドトランジスタＭ２の制御信号ＳＨ，ＳＬを生成する。過電圧検出回路２３０は、降圧コンバータ１００の出力電圧ＶＯＵＴがしきい値電圧ＶＯＶＰより高い過電圧状態を検出する。ロジック回路２２０は、過電圧状態が所定時間持続すると、ハイサイドトランジスタＭ１およびローサイドトランジスタＭ２をオフとする。【選択図】図１