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AN4460 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN4460 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 54 page DocID026129 Rev 1 7/54 AN4460 Demonstration board features 54 To guarantee the maximum reliability of the demonstration board against the most common LED failures, the STLUX385A implements the following software and hardware protections: For each LED string: – Overcurrent – Short-circuit – LED voltage drop falls below the 2.9 V limit – LED voltage drop higher than the 4.2 V limit – Disconnected string (open circuit) Power voltage outside configured lower / upper limits. The STLUX385A device drives the 4 LED channels (CH0, CH1, CH2, CH3) seen on the right side of the board. The board uses a DC-DC converter to supply the MOS drivers (U3, U2) with 10 V, while the STLUX385A (3.3 V or 5 V) is powered by a linear regulator. There are three buttons to manually change the dimming period. The DALI and UART TTL interfaces are supported. Two LEDs indicate the board status: the green one shows that the system is “ready” while the red one indicates a system fault or the intervention of a protection mechanism. |
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