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LP8866S-Q1 Datasheet(PDF) 37 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 37 Page - Texas Instruments |
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37 / 82 page  7.3.9.4 Overview of the Fault and Protection Schemes Table 7-9. Fault and Protection Schemes FAULT NAME STATUS BIT CONDITION TRIGGER FAULT INTERRUPT ENTER FAULT RECOVERY ACTION VIN undervoltage VINUVLO_STATUS UVLO voltage falls below 0.787 V. Yes Yes Device goes to standby and then attempts to restart once the input voltage rises above threshold. VIN overvoltage VINOVP_STATUS VIN voltage rises above 43 V. Yes Yes Device goes to standby and waits until input voltage falls below threshold before restarting. VDD undervoltage VDDUVLO_STATUS VDD level falls below VDDUVLO threshold. Yes No Device restarts once VDD level rises above VDDUVLO threshold. VIN overcurrent VINOCP_STATUS Voltage across RISENSE exceeds 220 mV. Yes Yes Device goes to Fault Recovery and then attempts to restart 100 ms after fault occurs. Charge pump fault CP_STATUS Charge pump voltage level is abnormal. Yes Yes Device goes to Fault Recovery and then attempts to restart 100 ms after fault occurs. Charge pump components missing CPCAP_STATUS Charge pump is missing components. Yes No Charge pump is disabled. Charge pump fault will be reported. Device tries to keep normal operation. Boost sync clock invalid fault BSTSYNC_STATUS Device is enabled while a valid external SYNC clock is running. Then SYNC stops or changes to frequency < 75 kHz. Yes No Defaults to internal clock frequency selected by BST_FSET resistor. If BST_SYNC input is held high then spread spectrum is enabled. If BST_SYNC input is held low then spread spectrum is disabled. CRC error CRCERR_STATUS Factory default configuration for registers, options and trim bits are not correctly loaded from memory. Yes No Device functions normally, if possible. Boost OVP low BSTOVPLOW_STATUS FB pin voltage rises above VFB_OVPL level. No No Boost stops switching until boost voltage level falls. The device remains in normal mode with LED drivers operational. Boost OVP high BSTOVPH_STATUS FB pin voltage rises above VFB_OVPH level or DISCHARGE pin voltage rises above VBST_OVPH. Yes Yes Device goes to Fault Recovery and waits until output voltage falls below threshold before restarting. Boost overcurrent BSTOCP_STATUS FB pin voltages falls below VUVP level for 110 ms. Yes Yes Device goes to Fault Recovery and then attempts to start 100 ms after fault occurs. LEDSET detection fault LEDSET_STATUS LEDSET resistor missing or invalid. No No Defaults to 6-channel / 150-mA configuration. MODE detection fault MODESEL_STATUS MODE resistor missing or invalid. No No Defaults to phase-shift PWM mode, I2C address is 0x2A. FSET detection fault FSET_STATUS BST_FSET or PWM_FSET resistor are missing or an invalid value. No No Device keeps operating at 400-kHz switching frequency for boost converter and 305 Hz for PWM dimming frequency. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 37 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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