전원 관리 LED 드라이버 백라이트 LED 드라이버

LP8556

활성

6채널 고효율/효율 LED 백라이트 드라이버

제품 상세 정보

Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² 2.2 x 1.8 WQFN (RTW) 24 16 mm² 4 x 4
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package

The LP8556 device 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 low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. 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 fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.

The LP8556 device 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 low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. 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 fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.

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기술 문서

star =TI에서 선정한 이 제품의 인기 문서
검색된 결과가 없습니다. 검색어를 지우고 다시 시도하십시오.
모두 보기11
유형 직함 날짜
* Data sheet LP8556 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. M) PDF | HTML 2020/06/10
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 AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) 2019/06/14
Selection guide Power Management Guide 2018 (Rev. R) 2018/06/25
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
Application note Power Budget for Backlight Drivers 2013/06/27
Application note Increasing Full-Load Efficiency of a Backlight Driver 2013/06/05
EVM User's guide LP8556SQ-EVM User's Guide 2012/09/27
EVM User's guide LP8556TM-EVM User Guide 2012/08/17

설계 및 개발

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

평가 보드

LP8556SQ-EVM — LP8556SQ-EVM

The Texas Instruments LP8556SQ-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

사용 설명서: PDF
TI.com에서 구매할 수 없습니다
평가 보드

LP8556TM-EVM — LP8556TM-EVM

The Texas Instruments LP8556TM-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

사용 설명서: PDF
TI.com에서 구매할 수 없습니다
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
  • (...)
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 (...)
레퍼런스 디자인

TIDA-01635 — 90Hz 재생률의 가상/증강 현실 디스플레이를 위한 백라이트 및 LCD 바이어스 레퍼런스 설계

이 레퍼런스 설계는 웨어러블 디바이스의 LCD 디스플레이를 위한 전원 솔루션, 특히 AR(증강 현실) 및 VR(가상 현실) 헤드셋에 대해 설명합니다. LP8556으로 고전류 정확도의 백라이트 드라이버를 달성하여 작은 듀티 사이클에서 고전류를 제공하고 주사율과 동기화합니다. LCD 바이어스 전원 드라이버는 사용이 간편하고 작은 패키지가 포함된 TPS65132에서 제공합니다. 자세한 설계 이론, 구성 요소 선택 및 테스트 결과도 설명합니다.
Design guide: PDF
회로도: PDF
패키지 다운로드
DSBGA (YFQ) 20 옵션 보기
WQFN (RTW) 24 옵션 보기

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

권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.

지원 및 교육

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