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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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VIPER25HD 데이터시트(PDF) 17 Page - STMicroelectronics |
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VIPER25HD 데이터시트(HTML) 17 Page - STMicroelectronics |
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17 / 40 page  VIPER25 Operation description Doc ID 15585 Rev 4 17/40 As soon as the output voltage reaches the regulated value, the regulation loop takes over and the drain current is regulated below its limit, IDlim, by the feedback voltage, which settles at a value lower than the threshold VFBlin Figure 22. IDD current during start-up and burst mode Figure 23. Timing diagram: normal power-up and power-down sequences BURST MODE NORMAL MODE START- UP NORMAL MODE I DDch (-3 mA) I DD1 I DD0 IDD V FBbm VFB VDRAIN V FBbmhys V FBlin V FBolp VDD V DDoff V DDon t t t t I DD V DD V DRAIN V DDon time V IN V DRAIN_START Power-on Power-off Normal operation regulation is lost here V IN < VDRAIN_START HV startup is no more activated V DDoff V DD(RESTART) I DDch (3mA) time time time |
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