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LP8866S-Q1 Datasheet(PDF) 32 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 82 page  L FB VSENSE_P VDD ISNSGND VIN COUT ISNS GD CIN VSENSE_N SD PGND VOUT 3 to 48V SGND 3.3V/5V UVLO EN R4 R5 Figure 7-17. VIN UVLO Setting Circuit Without Current Leakage Path 7.3.9.1.2 VIN Overvoltage Faults (VINOVP) The overvoltage threshold for VIN rising edge is internal fixed at typical 43 V. If during LP8866S-Q1 operation, VSENSE_P pin voltage rises above the OVP rising threshold, boost, LED outputs, and power-line FET will be turned off, and the device will enter STANDBY mode. The VINOVP_STATUS bit will also be set in the SUPPLY_FAULT_STATUS register, and the INT pin will be triggered. When the VSENSE_P pin voltage falls below the falling threshold level, the LP8866S-Q1 exits STANDBY and begins the start-up sequence. 7.3.9.1.3 VDD Undervoltage Faults (VDDUVLO) If during LP8866S-Q1 device operation VDD falls below VDDUVLO falling level, boost, power-line FET, and LED outputs are turned off, and the device enters STANDBY mode. The VDDUVLO_STATUS fault bit will be set in the SUPPLY_FAULT_STATUS register, and the INT pin will be triggered. The LP8866S-Q1 restarts automatically to ACTIVE mode when VDD rises above VDDUVLO rising threshold. 7.3.9.1.4 VIN OCP Faults (VINOCP) If during LP8866S-Q1 device operation voltage drop on RISENSE resistor rises above 220 mV, boost, power- line FET, and LED outputs are turned off, and the device enters Fault Recovery mode and then attempt to restart 100 ms after fault occurs. The VINOCP_STATUS fault bit are set in the SUPPLY_FAULT_STATUS register, and the INT pin is triggered. OCP _ TH ISEN VIN _ OC S P E VIN I = R (19) where • VINOCP_TH = 220 mV 7.3.9.1.4.1 VIN OCP Current Limit vs. Boost Cycle-by-Cycle Current Limit VIN OCP current limit is totally different from boost cycle-by-cycle current limit. Boost cycle-by-cycle current limit is to protect the DC/DC components (inductor, schottky diode and switching MOSFET) in normal scenario, avoiding current running over their max limit. The normal scenario means when loading has sharp change or input voltage has sharp change. It won't trigger any device fault. VIN OCP current limit is to protect system from ciritical system hazard (e.g, inductor short, switching MOSFET short). It will trigger the device to shutdown all the LED channels and enter into fault recovery state. VIN OCP current limit should be always greater than boost cycle-by-cycle current limit. This means RISENSE should be always no smaller than RSENSE. LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 32 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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