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LP8866S-Q1 Datasheet(PDF) 18 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 82 page  No actions Boost decreases voltage Boost Increases voltage No output is close to VHEADROOM threshold One output is lower than VHEADROOM threshold Normal Conditions Dynamic Conditions OUT1~6 PIN VOLTAGE VLEDSHORT VHEADROOM+VHEADROOM_HYS VHEADROOM The lowest channel voltage touches VHEADROOM threshold Figure 7-4. Adaptive Boost Voltage Control Loop Function The resistive divider (R1, R2) defines both the minimum and maximum adaptive boost voltage levels. The feedback circuit operates the same in boost and SEPIC topologies. Choose maximum boost voltage based on the maximum LED string voltage specification. Before the LED drivers are active, the boost starts up to the initial boost level. The initial boost voltage is approximately in the 88% point of minimum to maximum boost voltage. Once the LED driver channels are active, the boost output voltage is adjusted automatically based on OUTx pin voltages. The FB pin resistor divider also scales the boost OVP, OCP levels and the LED short level in HUD application. 7.3.6.3.1 FB Divider Using Two-Resistor Method A typical FB-pin circuit uses a two-resistor divider circuit between the boost output voltage and ground. + ± R Q Q S VREF R2 GM + ± CURRENT RAMP GENERATOR COMP + ± GM OVP OCP TSD R1 COUT CIN PGND ISNS ISNSGND FB GD CPUMP VIN VOUT Pulse Generator + ± + ± + ± VOVPH VOVPL VUVP BSTOVPH BSTOVPL BSTOCP ISEL[10:0] Figure 7-5. Two-Resistor FB Divider Circuit LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 18 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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