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LP8556 датащи(PDF) 12 Page - Texas Instruments

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номер детали LP8556
подробное описание детали  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP8556 датащи(HTML) 12 Page - Texas Instruments

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LED Current Sinks
VBOOST
PWM Control
Headroom
Control
LED1
LED2
LED3
LED4
LED5
LED6
Boost Converter
SW
Switching
Frequency
312, 625, 1250
kHz
Oscillator
Thermal
shutdown
Reference
Voltage
LDO
VLDO
VDD
PWM
POR
PWM Detector
Fault Detection
(Open LED,
OCP, OVP)
VIN
SDA
SCL
I
2
C Slave
BRIGHTNESS
CONTROL
EPROM
BOOST_FREQ
BOOST_FREQ
PWM_FREQ
FSET
ISET
VOUT
EN/VDDIO
12
LP8556
SNVS871I – JULY 2012 – REVISED MARCH 2016
www.ti.com
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
LP8556 is a white LED driver featuring an asynchronous boost converter and six high-precision current sinks that
can be controlled by a PWM signal or an I2C master.
The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as high as
43 V. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under
all conditions. The converter can operate at three switching frequencies: 312, 625, and 1250 kHz pre-configured
via EPROM or can be set through an external resistor. Programmable slew rate control and spread spectrum
scheme minimize switching noise and improve EMI performance.
LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming
mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible
noise and smaller boost output capacitors.
The LP8556 device has a full set of safety features that ensure robust operation of the device and external
components. The set consists of input undervoltage lockout, thermal shutdown, overcurrent protection, up to six
levels of overvoltage protection, LED open, and short detection.
8.2 Functional Block Diagram



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