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RT8549LGQW Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT8549LGQW Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 24 page  3 RT8549L DS8549L-00 May 2019 www.richtek.com © Copyright 2019 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Functional Block Diagram Operation The RT8549L integrates four LED drivers and a Boost converter. When EN is High and VIN is higher than the UVLO for a white, the RT8549L will detect the status of the channel. Then the digital part will be reset and set all default states registers. Once SMBus receives a “STOP” signal, the RT8549L will start to check PWM duty and then enter soft-start mode. The RT8549L will choose the minimum value of VLED as the feedback voltage of Boost converter. During operation, when a LED string is defined as short, the driver of that channel will be turned off. When LED string is defined as open, the driver of that channel will be turned off, and auto-recovery when the “OPEN” is released. Once “VOUT shorted to GND” or “Schottky diode shorted ” are defined as the fault condition, the RT8549L will alarm this condition through the fault flag of SMBus. The fault flag could also be cleared through the SMBus. OSC + + - + - VDS OCP LDO PWM Controller Mini LED Selection + - VREF + - + - + - …… + - 4 PWM VIN VOUT COMP CS1 CS2 GND CS4 LX R SQ Q EN LED Open Detection SMBCLK DAC VDC OTP SMBus SMBDAT PGND > FAULT FAULT |
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