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LP8866S-Q1 Datasheet(PDF) 65 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 65 Page - Texas Instruments |
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65 / 82 page  8.2.3.1 Design Requirements This typical LED-driver application is designed to meet the parameters listed in Table 8-5: Table 8-5. LP8866S-Q1 SEPIC Mode Design Parameters DESIGN PARAMETER VALUE VIN voltage range 4.5 V to 20 V (quiescent voltage) VDD voltage 3.3 V LED strings configuration 5 strings, 3 LEDs in series Charge pump Enabled Brightness control I2C Output configuration OUT1 to OUT5 are in phase shift PWM mode LED string current 80 mA Boost frequency 2.2 MHz Inductor 10 µH at 4-A saturation current RISENSE 20 mΩ Power-line FET Enabled RSENSE 50 mΩ Input/Output capacitors CIN and COUT: 1 × 33-µF electrolytic + 1 × 10-µF ceramic Spread spectrum Enabled Discharge function Enabled . 8.2.3.2 Detailed Design Procedure 8.2.3.2.1 Inductor Selection Inductance for both inductors can be selected from Table 8-6, depending on operating frequency for the application. Current rating is recommended to be at least 25% higher than maximum inductor peak current. Peak-to-peak ripple current can be estimated to be approximately 40% of the maximum input current and and inductor peak current can be calculated with Equation 24, Equation 25, and Equation 26: Table 8-6. Inductance Values for SEPIC Switching Frequencies SW FREQUENCY (kHz) INDUCTANCE (µH) 100 22 200 15 303 10 400 10 500 10 1818 4.7 2000 4.7 2222 4.7 OUT D L1(peak) OUT IN(min) V V 40% I = I 1 + V 2 · § u u ¨ ¸ © ¹ (24) where • IL1(peak): Peak current for inductor 1 • IOUT: Maximum output current • VOUT: Output voltage www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 65 Product Folder Links: LP8866S-Q1 |
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