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LP8866S-Q1 Datasheet(PDF) 39 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 82 page  7.4 Device Functional Modes 7.4.1 State Diagram SHUTDOWN VDD > VDDUVLO EN = High DEVICE INIT PL FET SOFTSTART BOOST SOFTSTART 25 ms NORMAL 50 ms FAULT RECOVERY FAULT LATCH FAULT All LED channel have been disabled due to open or short faults DISCHARGE EN = 0 DISCHARGE DONE And EN = 0 STANDBY FAULT FAULT 100ms EN = 0 15 ms Figure 7-19. State Machine Diagram 7.4.2 Shutdown When EN is pulled low, boost, power-line FET, and LED outputs are turned off, and the device tries to discharge the boost output for 400 ms. After this, the device is totally turned off. 7.4.3 Device Initialization After POR is released device initialization begins. During this state the LDO is started up, EEPROM default and trim configurations are loaded, LEDSET, MODE, BOOST_FSET and PWM_FSET resistors are detected. 7.4.4 Standby Mode Starting from Standby mode, the device can be accessed with I2C to change any configuration registers. Standby Mode is immediately switched to Power-line FET Soft Start mode if there's no fault. 7.4.5 Power-line FET Soft Start Power-line FET is gradually enabled during this 25-ms long state. Boost input and output capacitors are charged to VIN level. VIN faults for OCP, OVP, and UVP and fault for LED short to GND are enabled. 7.4.6 Boost Start-Up Boost voltage is ramped to initial boost voltage level with reduced current limit for 50 ms. All boost faults are now enabled. 7.4.7 Normal Mode LED drivers are enabled when brightness is greater than zero. All LED faults are active. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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