전원 관리 LED 드라이버 백라이트 LED 드라이버

LP8557

활성

태블릿용 고효율 LED 백라이트 드라이버

제품 상세 정보

Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 7 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 93 Topology Boost Features CABC, Edge Rate Control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 7 Vout (max) (V) 28 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 93 Topology Boost Features CABC, Edge Rate Control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 16 3.24 mm² 1.8 x 1.8
  • High-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET
  • 2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery Applications
  • Six 25-mA High-Precision LED Current Sinks
  • Adaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System Efficiency
  • LED String Count Auto-Detect for Maximum Design Flexibility
  • Smart Phase Shift PWM Mode for Reduced Audible Noise
  • PWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input Frequency
  • Hybrid PWM Plus Current Dimming for Higher LED Drive Optical Efficiency
  • Switching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C Interface
  • Programmable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI Performance
  • UVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault Coverage
  • Minimum Number of External Components
  • High-Efficiency DC-DC Boost Converter With 28-V Integrated Power MOSFET
  • 2.7-V to 5.5-V VDD Range for Supporting Single-Cell Li-Ion Battery Applications
  • Six 25-mA High-Precision LED Current Sinks
  • Adaptive Boost Voltage and LED Current Sink Headroom Controls for Maximum System Efficiency
  • LED String Count Auto-Detect for Maximum Design Flexibility
  • Smart Phase Shift PWM Mode for Reduced Audible Noise
  • PWM Input Duty Cycle Brightness Control, PWM Output Frequency Selectable Independent of Input Frequency
  • Hybrid PWM Plus Current Dimming for Higher LED Drive Optical Efficiency
  • Switching Frequency, PWM Output Frequency, and LED Current can be set Through Resistors or I2C Interface
  • Programmable Boost SW Slew Rate Control and Spread Spectrum Scheme for Reduced Switching Noise and Improved EMI Performance
  • UVLO, TSD, BST_OVP, BST_OCP, BST_UV, LED OPEN* and LED Short Fault Coverage
  • Minimum Number of External Components

The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.

The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.

The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.

The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.

Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.

Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.

For all available packages, see the orderable addendum at the end of the data sheet.

The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can utilize an I2C master as well.

The boost converter has adaptive output voltage control. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions.

The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for optimal system efficiency.

The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the maximum design flexibility.

Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase-shift PWM allows reduced audible noise and smaller boost output capacitors.

Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.

For all available packages, see the orderable addendum at the end of the data sheet.

다운로드 스크립트와 함께 비디오 보기 동영상

관심 가지실만한 유사 제품

open-in-new 대안 비교
비교 대상 장치와 유사한 기능
LP8556 활성 6채널 고효율/효율 LED 백라이트 드라이버 This product is a six channel high-efficiency/efficacy LED backlight driver for notebook.

기술 자료

star =TI에서 선정한 이 제품의 인기 문서
검색된 결과가 없습니다. 검색어를 지우고 다시 시도하십시오.
6개 모두 보기
유형 직함 날짜
* Data sheet LP8557 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. B) PDF | HTML 2015/12/18
White paper Common LED Functions and LED Driver Design Considerations 2020/09/21
Application note Some Guidelines and Tips for the LED Driver Application 2019/08/14
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 2016/10/24
Application note Schottky Diode Selection in Asynchronous Boost Converters 2016/09/06
User guide LP8557 Evaluation Module 2013/12/17

설계 및 개발

추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.

평가 보드

LP8557EVM — LP8557 6채널 고효율 LCD 백라이트 드라이버용 평가 모듈

LP8557 6-channel high efficiency LCD backlight driver evaluation kit.  The LP8557 evaluation kit only requires a power source and a PWM source.    When powered on, the LED brightness is controlled by the pulse width of the PWM signal.

사용 설명서: PDF
TI.com에서 구매 불가
평가 보드

LP8557IEVM — I2C 제어를 지원하는 LP8557 고효율 백색 LED 백라이트 드라이버용 평가 모듈

LP8557IEVM is a 6-channel high efficiency LCD backlight driver evaluation kit that includes an I2C compatible program and USB2ANY adapter board with mini USB cable that exercises the part in a simple way.  The status of the device is monitored by the evaluation software and the various (...)

사용 설명서: PDF
TI.com에서 구매 불가
드라이버 또는 라이브러리

LP8550SW-LINUX — LP8550용 Linux 드라이버

The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lp8550
  • lp8551
  • lp8552
  • (...)
평가 모듈(EVM)용 GUI

SNVC125 LP8557 evaluation program

지원되는 제품 및 하드웨어

지원되는 제품 및 하드웨어

제품
백라이트 LED 드라이버
LP8557 태블릿용 고효율 LED 백라이트 드라이버
하드웨어 개발
평가 보드
LP8557IEVM I2C 제어를 지원하는 LP8557 고효율 백색 LED 백라이트 드라이버용 평가 모듈
시뮬레이션 툴

PSPICE-FOR-TI — TI 설계 및 시뮬레이션 툴용 PSpice®

TI용 PSpice®는 아날로그 회로의 기능을 평가하는 데 사용되는 설계 및 시뮬레이션 환경입니다. 완전한 기능을 갖춘 이 설계 및 시뮬레이션 제품군은 Cadence®의 아날로그 분석 엔진을 사용합니다. 무료로 제공되는 TI용 PSpice에는 아날로그 및 전력 포트폴리오뿐 아니라 아날로그 행동 모델에 이르기까지 업계에서 가장 방대한 모델 라이브러리 중 하나가 포함되어 있습니다.

TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
패키지 CAD 기호, 풋프린트 및 3D 모델
DSBGA (YFQ) 16 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

지원 및 교육

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