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LP8866S-Q1 Datasheet(PDF) 61 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 61 Page - Texas Instruments |
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61 / 82 page  Table 8-3. Recommended Component Values for Full Feature Design Example REFERENCE DESIGNATOR DESCRIPTION NOTE RISENSE 20 mΩ, 3 W Input current sensing resistor RSD 20 kΩ, 0.1 W Power-line FET gate pullup resistor RSENSE 30 mΩ, 3 W Boost current sensing resistor RG 15 Ω, 0.1 W Gate resistor to control the rising/falling time of nMOSFET for EMC RUVLO1 76.8 kΩ, 0.1 W These UVLO resistor settings set the VIN_UVLO rising voltage at 3.75 V, VIN_UVLO falling voltage at 3.35 V RUVLO2 20.5 kΩ, 0.1 W RFB3 0 Ω, 0.1 W Not needed unless 100-kΩ restrictions on resistors RFB2 100 kΩ, 0.1 W Bottom feedback divider resistor RFB1 910 kΩ, 0.1 W Top feedback divider resistor RBST_FSET 3.92 kΩ, 0.1 W Boost frequency set resistor (400 kHz) RISET 20.8 kΩ, 0.1 W Current set resistor (150 mA per channel) RPWM_FSET 17.8 kΩ, 0.1 W Output PWM frequency set resistor (4.88kHz PWM frequency to avoid audible noise) RMODE 3.92 kΩ, 0.1 W Mode resistor (Phase-Shift PWM mode with 0x2B I2C address) RLED_SET 3.92 kΩ, 0.1 W LED_SET resistor (6channels configuration) CPUMP 10-µF, 10-V ceramic Charge-pump output capacitor C2X 2.2-µF, 10-V ceramic Flying capacitor CVDD 4.7-µF + 0.1-µF, 10-V ceramic VDD bypass capacitor CIN 1 × 33-µF, 50-V electrolytic + 1 × 10-µF, 50-V ceramic Boost input capacitor COUT 1 × 33-µF, 50-V electrolytic + 1 × 10-µF, 50-V ceramic Boost output capacitor L1 22-μH saturation current 6.5 A Boost inductor D1 50 V, 6.5-A Schottky diode Boost Schottky diode Q1 60-V, 15-A nMOSFET Boost nMOSFET Q2 60-V, 15-A pMOSFET Power-line FET 8.2.1.3 Application Curves FLED_PWM = 305 Hz Phase Shift 60° 6 Strings Figure 8-3. LED String Currents Showing Phase Shift PWM Operation ƒSW = 400 kHz 150 mA/String CIN = COUT = 1 × 33 μF (electrolytic) + 1 × 10 μF (ceramic) Figure 8-4. Typical Start-Up www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 61 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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