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LP8862-Q1 Datasheet(PDF) 10 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) 10 Page - Texas Instruments

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LP8862-Q1
SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LP8862-Q1 is a highly integrated LED driver for automotive infotainment, lighting systems, and medium-
sized LCD backlight applications. It includes a DC-DC with an integrated FET, supporting both boost and SEPIC
modes, an internal LDO enabling direct connection to battery without need for a pre-regulated supply, and two
LED current sinks. A VDDIO/EN pin provides the supply voltage for digital IOs (PWM and SYNC inputs) and at
the same time enables the device.
The switching frequency on the DC-DC regulator is set by a resistor connected to the FSET pin. The maximum
output voltage of the DC-DC is set by a resistive divider connected to the FB pin. For best efficiency the output
voltage is adapted automatically to the minimum necessary level needed to drive the LED strings. This is done
by monitoring LED output voltage drop in real time. For EMI reduction and control two optional features are
available:
Spread spectrum, which reduces EMI noise around the switching frequency and its harmonic frequencies
DC-DC can be synchronized to an external frequency connected to SYNC pin
The two constant current sinks OUT1 and OUT2 provide LED current up to 160 mA. Value for the current per
OUT pin is set with a resistor connected to ISET pin. Unused current sink must be connected to ground.
Grounded sink is disabled and excluded from adaptive output voltage control and LED string fault detection.
Brightness is controlled with the PWM input. Frequency range for the input PWM is from 100 Hz to 20 kHz. LED
output PWM follows the input PWM so the output frequency is equal to the input frequency.
The LP8862-Q1 has extensive fault detection features:
Open-string and shorted LED detections
LED fault detection prevents system overheating in case of open or short in some of the LED strings
VIN input overvoltage protection
Threshold sensing from VIN pin
VIN input undervoltage protection
Threshold sensing from VIN pin
VIN input overcurrent protection
Threshold sensing across RISENSE resistor
Thermal shutdown in case of die overtemperature
Fault condition is indicated with the FAULT output pin. Additionally, the LP8862-Q1 supports control for an
optional power-line FET allowing further protection by disconnecting the device from power-line in fault condition.
With the power-line FET control it possible to protect device itself, DC-DC external components and LEDs in
case of shorted VOUT and too-high VIN voltage. Power-line FET control also features soft-start which reduces the
peak current from the power-line during start-up.
10
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Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: LP8862-Q1


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