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LP8862-Q1 Datasheet(PDF) 21 Page - Texas Instruments |
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LP8862-Q1 Datasheet(HTML) 21 Page - Texas Instruments |
21 / 37 page ![]() LP8862-Q1 FB PWM OUT1 L1 D1 Up to 37 V 4.5...28 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 RFSET Q1 R1 R2 RGS R3 CLDO BRIGHTNESS SYNC EN CIN CIN BOOST OUT2 CFB LP8862-Q1 www.ti.com SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015 8 Application and Implementation 8.1 Application Information The LP8862-Q1 is designed for automotive applications, and an input voltage VIN is intended to be connected to the automotive battery. Device circuitry is powered from the internal LDO, which can alternatively be used as an external VDD voltage — in this case external voltage should be in 4.5-V to 5.5-V range. The LP8862-Q1 uses a simple four-wire control: • VDDIO/EN for enable • PWM input for brightness control • SYNC pin for boost synchronisation (optional) • FAULT output to indicate fault condition (optional) 8.2 Typical Applications 8.2.1 Typical Application for 2 LED Strings Figure 19 shows typical application for the LP8862-Q1 which supports 2 LED strings with maximum current 160 mA per string. Boost switching frequency in this example is is 400 kHz. Figure 19. LP8862-Q1 Boost Mode, Two Strings, 160-mA String Configuration Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: LP8862-Q1 |
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