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LP8556 bảng dữ liệu(PDF) 13 Page - Texas Instruments

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tên linh kiện LP8556
Giải thích chi tiết về linh kiện  High-Efficiency LED Backlight Driver for Tablets
PDF  52 Pages
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LP8556 bảng dữ liệu(HTML) 13 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
LP8556
www.ti.com
SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012
FUNCTIONAL 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
43V. 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 settable via 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 has a full set of safety features that ensure robust operation of the device and external components.
The set consists of input under-voltage lockout, thermal shutdown, over-current protection, up to six levels of
over-voltage protection, LED open and short detection.
Block Diagram
Figure 16. LP8556 Block Diagram
Copyright © 2012, Texas Instruments Incorporated
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