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LP8866S-Q1 Datasheet(PDF) 67 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 67 Page - Texas Instruments |
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67 / 82 page  also recommended to be 25% higher than peak current, which can be calculated with Equation 28. RDSON must be as low as possible — less than 20 mΩ is recommended. Thermal resistance (RθJA) must also be low to dissipate heat from power loss on switching FET. Typical rise/fall time values recommended are less than 10 ns. Q1(peak) L1(peak) L2(peak) I = I I (28) where • IQ1(peak): Peak current for switching FET • IL1(peak): Peak current for inductor 1 • IIL2(peak): : Peak current for inductor 2 BOOST_OCP 8.2.3.2.8 Output Diode A Schottky diode must be used for the SEPIC output diode. Current rating must be at least 25% higher than the maximum current, which is the same as switch peak current. Schottky diodes with a low forward drop and fast switching speeds are ideal for increasing efficiency. At maximum current, the forward voltage must be as low as possible; TI recommends less than 0.5 V. Reverse breakdown voltage of the Schottky diode must be able to withstand VIN(max) + VOUT(max); at least 25% higher voltage rating is recommended. Do not use ordinary rectifier diodes, because slow switching speeds and long recovery times cause efficiency and load regulation to suffer. 8.2.3.2.9 Switching Sense Resistor See Detailed Design Procedure. 8.2.3.2.10 Power-Line FET See Detailed Design Procedure. 8.2.3.2.11 Input Current Sense Resistor See Detailed Design Procedure. 8.2.3.2.12 Feedback Resistor Divider Feedback resistors RFB1 and RFB2 determine the maximum boost output level. Output voltage can be calculated as follows: BG OUT _ MAX SEL_MAX FB1 BG FB2 V V = + I R + V R · § u ¸ ¨ © ¹ (29) where • VBG = 1.21 V • ISEL_MAX = 38.7 µA • RFB1 / RFB2 normal recommended range is 5~15 (recommended for SEPIC Mode) 8.2.3.2.13 Critical Components for Design Figure 8-7 shows the critical part of circuitry: SEPIC components, the LP8866S-Q1 internal charge pump for gate-driver powering, and powering/grounding of LP8866S-Q1. Schematic example is shown below. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 67 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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