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LP8866S-Q1 Datasheet(PDF) 66 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 66 Page - Texas Instruments |
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66 / 82 page  • VD: Diode forward voltage drop • VIN(min): Minimum input voltage L2(peak) OUT 40% I = I 1 + 2 · § u ¨ ¸ © ¹ (25) where • IL2(peak): Peak current for inductor 2 • IOUT: Maximum output current OUT L IN OUT IN(min) V I = I 40% = I 40% V ' u u u (26) where • ΔIL: Inductor ripple current • IIN: Input current • VOUT: Output voltage • VIN(min): Minimum input voltage 8.2.3.2.2 Coupling Capacitor Selection The coupling capacitors Cs isolate the input from the output and provide protection against a shorted load. The selection of SEPIC capacitors, Cs, depends mostly on the RMS current, which can be calculated with Equation 27. The capacitors must be rated for a large RMS current relative to the output power; TI recommends at least 25% higher rating for IRMS. When using uncoupled inductors, use one 10-µF ceramic capacitor in parallel with one 33-µF electrolytic capacitor and series 2-Ω resistor. If coupled inductors are used, then use only one 10-µF ceramic capacitor. OUT D Cs(rms) OUT IN(min) V V I = I V u (27) where • ICs(rms): RMS current of Cs capacitor • IOUT: Output current • VOUT: Output voltage • VD: Diode forward voltage drop • VIN(min): Minimum input voltage 8.2.3.2.3 Output Capacitor Selection See Detailed Design Procedure. 8.2.3.2.4 Input Capacitor Selection See Detailed Design Procedure. 8.2.3.2.5 Charge Pump Output Capacitor See Detailed Design Procedure. 8.2.3.2.6 Charge Pump Flying Capacitor See Detailed Design Procedure. 8.2.3.2.7 Switching FET Gate-drive voltage for the FET is 5V. Use an N-type MOSFET for the switching FET. The switching FET for SEPIC mode sees a maximum voltage of VIN(max) + VOUT, 25% higher rating is recommended. Current rating is LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 66 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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