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LP8866S-Q1 Datasheet(PDF) 56 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 56 Page - Texas Instruments |
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56 / 82 page  8 Application and Implementation Note Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes, as well as validating and testing their design implementation to confirm system functionality. 8.1 Application Information The LP8866S-Q1 device is designed for automotive applications, and an input voltage VIN is intended to be connected to the vehicle battery. Depending on the input voltage, the device may be used in either boost mode or SEPIC mode. The device is internally powered from the VDD pin, and voltage must be in 2.7-V to 5.5-V range. The device has flexible configurability through external components or by an I2C interface. If the VDD voltage is not high enough to drive an external nMOSFET gate, an internal charge pump must be used to power the gate driver (GD pin). 8.2 Typical Applications 8.2.1 Full Feature Application for Display Backlight Figure 8-1 shows a full application for the LP8866S-Q1 device in a boost topology. It supports 6 LED strings in display mode, each at 150 mA, with an automatic 60° phase shift. Brightness control register is used for LED dimming method through I2C communication. The charge pump is enabled for a 400-kHz boost switching frequency with spread spectrum. L OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 FB VDD LP8866(S)-Q1 ISNSGND PWM VIN EN BST_FSET COUT ISNS GD PWM_FSET LED_SET BST_SYNC CIN SGND SCL SDA INT ISET SD MODE LED_GND PGND VOUT VSENSE_N VSENSE_P RISENSE C1N C1P CPUMP UVLO DISCHARGE VDD HOST I2C VDD CVDD C2x CPUMP RG RSENSE RFB1 RFB2 RFB3 RISET RUVLO1 RUVLO2 RSD RMODE RBST_FSET RPWM_FSET RLED_SET Figure 8-1. Full Feature Application for Display Backlight 8.2.1.1 Design Requirements This typical LED-driver application is designed to meet the parameters listed in Table 8-1: Table 8-1. LP8866S-Q1 Full-Feature Design Parameters DESIGN PARAMETER VALUE VIN voltage range 5 V to 20 V (Quiescent Voltage) LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 www.ti.com 56 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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