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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L99LD01 데이터시트(PDF) 23 Page - STMicroelectronics |
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L99LD01 데이터시트(HTML) 23 Page - STMicroelectronics |
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23 / 69 page  DocID025319 Rev 3 23/69 L99LD01 Functional description 68 Figure 12. Converter frequency range vs RSF and IRSF vs frequency 2.2.10 Start up LED overvoltage management The following diagram shows the purpose of delay time windows “tDStart” and “tEnRecov”. The first delay window tDStart has been thought to ensure an initial time period for charging the external buffer capacitor of the charge pump C9. When VS is below VSMIN, the LED overvoltage recovery bit is set. During this time interval, triggered as soon as the battery voltage VS overcomes VSMIN threshold, the converter remain in a stop condition, independently from PWM_L. When the tDStart is elapsed (typ. 5 ms), the converter is released and behaves according to the PWM_L signal provided, that no failure occurs. If no LED overvoltage comes during the 2nd time interval tEnRecov, LED ov recovery bit is reset. |
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