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LP8866S-Q1 Datasheet(PDF) 57 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 57 Page - Texas Instruments |
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57 / 82 page  Table 8-1. LP8866S-Q1 Full-Feature Design Parameters (continued) DESIGN PARAMETER VALUE VDD voltage 3.3 V LED strings configuration 6 strings, 7 LEDs in series Charge pump Enabled Brightness control I2C Output configuration OUT1 to OUT6 are in phase shift mode (60°) LED string current 150 mA Boost frequency 400 kHz Inductor 22 µH at 6.5-A saturation current RISENSE 20 mΩ Power-line FET Enabled RSENSE 30 mΩ Input/Output capacitors CIN and COUT: 1 × 33-µF electrolytic + 1 × 10-µF ceramic Spread spectrum Enabled Discharge function Enabled 8.2.1.2 Detailed Design Procedure 8.2.1.2.1 Inductor Selection There are a few things to consider when choosing an inductor: inductance, current rating, and DC resistance (DCR). Table 8-2 shows recommended inductor values for each operating frequency. The LP8866S-Q1 device automatically sets internal boost compensation controls depending on the selected switching frequency. Table 8-2. Inductance Values for Boost Switching Frequencies SW FREQUENCY (kHz) INDUCTANCE (µH) 100 47 200 33 303 22 400 22 500 22 1818 10 2000 10 2222 10 The current rating of inductor must be at least 25% higher than maximum boost switching current ISW(max), which can be calculated with Equation 21. TI recommends to use an inductor with low DCR to achieve good efficiency. Efficiency varies with load condition, switching frequency, and components. 80% can be used as a typical estimation. 65% efficiency needs to take into account in extreme condition. OUT(max) L SW(max) I I I + 2 1 - D ' (21) where • ΔIL = VIN(min) × D / ƒSW × L • D = 1 – VIN(min) × η / VOUT • ISW(max): Maximum switching current • ΔIL: Inductor ripple current • IOUT(max): Maximum output current • D: Boost duty cycle www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 57 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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