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LP8862-Q1 Datasheet(PDF) 25 Page - Texas Instruments |
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LP8862-Q1 Datasheet(HTML) 25 Page - Texas Instruments |
25 / 37 page ![]() LP8862-Q1 FB PWM OUT1 L1 D1 4.5...30 V COUT SD VSENSE_N RISET Up to 160 mA/string SW LDO FSET VIN VDDIO/EN PGND GND PAD VIN RISENSE ISET FAULT VDDIO FAULT EN RFSET Q1 R1 R2 RGS R3 BRIGHTNESS BOOST SYNC SYNC C1 CLDO Up to 15 V CIN SEPIC CIN OUT2 LP8862-Q1 www.ti.com SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015 8.2.2 SEPIC Mode Application When LED string voltage can be above or below VIN voltage, SEPIC configuration can be used. In Figure 24 an external frequency is used to synchronize SEPIC switching frequency. External frequency can be modulated to spread switching frequency spectrum. Figure 24. SEPIC Mode, 2 Strings, 160-mA String Configuration Typical design parameters for a SEPIC-mode two-string configuration are shown in Table 6: Table 6. SEPIC Mode Design Parameters DESIGN PARAMETER VALUE VIN voltage range 4.5…30 V LED string 2 × 2 LEDs (9 V) LED string current 160 mA Max output voltage 15 V SEPIC switching frequency 300 kHz External boost sync used Internal spread spectrum not available, external frequency input can Spread spectrum be modulated L1 22 μH CIN 10 µF, 50 V CIN SEPIC 2 × (10-µF 50-V ceramic) + 33-µF 50-V electrolytic COUT 2 × (10-µF 50-V ceramic) + 33-µF 50-V electrolytic CLDO 1 µF, 10 V RISET 30 k Ω RFSET 210 k Ω RISENSE 50 m Ω R1 300 k Ω R2 130 k Ω R3 10 k Ω RGS 20 k Ω Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: LP8862-Q1 |
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