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L99LD01 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

tên linh kiện L99LD01
Giải thích chi tiết về linh kiện  High efficiency constant current LED driver for automotive applications
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L99LD01 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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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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