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LP8866S-Q1 Datasheet(PDF) 21 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 21 Page - Texas Instruments |
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21 / 82 page  1 BOOST_MIN REF 2 R V = +1 V R § · u ¨ ¸ © ¹ (8) When the boost OVP_LOW level is reached the boost controller stops switching the boost FET, and the BSTOVPL_STATUS bit is set. The LED drivers are still active during this condition, and the boost resumes normal switching operation once the boost output level falls. The boost OVP low voltage threshold changes dynamically with current boost voltage. It is calculated in Equation 9: ( ) § · u ¨ ¸ ¹ © 1 BOOST_OVPL BOOST FB_OVPL REF 2 R V = V + +1 V V R (9) where • VFB_OVPL= 1.423 V • VREF= 1.21 V When the boost OVP_LOW level is reached the boost controller enters fault recovery mode, and the BSTOVPH_STATUS bit is set. The boost OVP high-voltage threshold also changes dynamically with current boost voltage and is calculated in Equation 10: ( ) § · u ¨ ¸ ¹ © 1 BOOST_OVPH BOOST FB_OVPH REF 2 R V = V + +1 V V R (10) where • VFB_OVPH = 1.76 V • VREF= 1.21 V When the boost UVP level is reached the boost controller starts a 110-ms OCP counter. The LP8866S-Q1 device enters the fault recovery mode and sets the BSTOCP_STATUS bit if the boost voltage does not rise above the UVP threshold before the timer expires. The boost UVP voltage threshold also changes dynamically with current boost voltage and is calculated in Equation 11: ( ) 1 BOOST_UVP BOOST REF UVP 2 R V = V +1 V V R § · u ¨ © ¹ ¸ (11) where • VUVP = 0.886 V • VREF= 1.21 V 7.3.6.3.3 FB Divider Using External Compensation The device has internal compensation network to keep the DC-DC control loop in good stability in most cases. However, an additional external compensation network could also be added on FB-pin to offer more flexibility in loop design or solving some extreme use-cases. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 21 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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