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LP8862-Q1 Datasheet(PDF) 21 Page - Texas Instruments

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Part # LP8862-Q1
Description  High-Performance 2-Channel LED Driver
Download  37 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8862-Q1 Datasheet(HTML) 21 Page - Texas Instruments

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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
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