Texas Instruments LP8580EVM, Руководство пользователя

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4 SNVU495 – March 2016
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Copyright © 2016, Texas Instruments Incorporated
LP8580 Evaluation Board
User's Guide
SNVU495 – March 2016
LP8580 Evaluation Board
1 Introduction
The Texas Instruments LP8580EVM evaluation module helps designers evaluate the operation and
performance of LP8580 integrated circuit (IC). The LP8580EVM uses the LP8580 high-efficiency boost
converter and six LED outputs to drive display backlight with local dimming capability. More information
about the LP8580 capabilities can be found in the device data sheet (
SNVSA65 ).
In order to facilitate ease of testing and evaluation of this circuit, the EVM contains power supply
connection for the VIN and VDD voltages. Test points are provided for the key signals. The onboard
microcontroller can be used to control the digital input signals of the LP8580. A graphical user interface
(GUI) is provided for fast and easy evaluation of the device.
For evaluation purposes, the EVM has been tested over a 2.7-V to 27-V input voltage (V
IN
) range. V
DD
voltage needs to be within 2.9 V to 5 V. This voltage range is within the absolute maximum input range of
the LP8580. Users are cautioned to evaluate their specific operating conditions and choose components
with the appropriate voltage ratings before designing this support circuitry into a final product.
Table 1.
PART NUMBER PACKAGE BODY SIZE (NOM)
LP8580 QFN (24) 4.00 mm × 4.00 mm
2 Description of the LP8580 Device
The LP8580 IC is a high-efficiency LED driver with an integrated boost converter. It has 6 high–precision
current sinks that can be controlled individually through an SPI™ and I2C interface. The LP8580 device
includes support for regional backlight control (1D local dimming) with up to 6 independently controlled
backlight regions. The LP8580 IC also supports whole screen (0D dimming) content adaptive backlight
control such as CABC.
2.1 Features
• High-efficiency asynchronous DC-DC boost converter with integrated power FET
• Six high-precision current sinks with up to 50-mA output current/channel
• Individual LED string brightness control
• Supports both SPI and I2C interfaces for brightness control
• Extensive protection features including open and shorted LED fault detections
• 2.7-V – 27-V V
IN
input voltage range
2.2 Applications
• Mobile Phones
• Tablet PCs
• Notebooks