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LP8866S-Q1 Datasheet(PDF) 20 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 82 page  ( ) 1 BOOST_UVP BOOST REF UVP 2 R V = V +1 V V R § · u ¨ © ¹ ¸ (6) where • VUVP = 0.886 V • VREF = 1.21 V 7.3.6.3.2 FB Divider Using Three-Resistor Method A FB-pin circuit using a three-resistor divider circuit can be used for applications where less than 200-kΩ resistors are required. + ± 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] R3 Figure 7-6. Three-Resistor FB Divider Circuit Maximum boost voltage can be calculated with Equation 7. The maximum boost voltage can be reached during OPEN string detection or if all LED strings are left disconnected. 1 3 1 BOOST_MAX 1 3 SEL_MAX REF 2 2 R R R V = +R +R I + +1 V R R § · § · u u u ¨ ¸ ¨ ¸ © ¹ © ¹ (7) where • VREF = 1.21 V • ISEL_MAX = 38.7 µA • R1 / R2 normal recommended range is 7 to 15 The minimum boost voltage must be less than the minimum LED string voltage. Minimum boost voltage is calculated in Equation 8: LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 20 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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