LP8555
- Dual High-Efficiency DC/DC Boost Converters
- 2.7-V to 20-V VDD Range
- 12 50-mA High-Precision LED Current
Sinks With 12-Bit Brightness Control - Adaptive LED Current Sink Headroom
Controls for Maximum System Efficiency - LED String Count Auto-Detection
- Phase-Shifted PWM Mode for Reduced Audible
Noise - PWM Input Duty-Cycle and/or I2C-Register
Brightness Control - Hybrid PWM and Current Dimming for Higher LED
Drive Optical Efficiency - Flexible CABC Support
- EPROM, I2C-Register, or External Resistors
for Configuration - Improved Boost EMI Performance with Slew-Rate Control,
Spread Spectrum, and Phase-Shifted Switching - Extensive Fault Detection Schemes
The LP8555 is a high efficiency LED driver with integrated dual DC-DC boost converters. It has 12 high-precision current sinks that can be controlled by a PWM input signal, an I2C master, or both.
Dual-boost configuration of LP8555 shares the load to two inductors and allows thinner overall solution size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number of LEDs with optimal efficiency since boost conversion ratio can be kept low.
The boost converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.
The LED string auto-detect function enables use of the same device in systems with 2 to 12 LED strings for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode 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.
기술 문서
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | LP8555 High-Efficiency LED Backlight Driver for Tablet PCs datasheet | PDF | HTML | 2014/02/21 |
| 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 | ||
| User guide | Using the LP8555 Evaluation Module | 2014/02/21 |
설계 및 개발
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LP8555EVM — 고효율 LED 백라이트 드라이버 평가 모듈
The Texas Instruments LP8555EVM evaluation module (EVM) helps designers evaluate the operation and performance of this device. The LP8555EVM uses the LP8555 to drive up to 12 LED strings for LCD backlighting with high efficiency. Information about output voltage and current ratings of LP8555EVM can (...)
LP8550SW-LINUX — LP8550용 Linux 드라이버
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp8550
- lp8551
- lp8552
- (...)
PSPICE-FOR-TI — TI 설계 및 시뮬레이션 툴용 PSpice®
TI 설계 및 시뮬레이션 환경용 PSpice는 기본 제공 라이브러리를 이용해 복잡한 혼합 신호 설계를 시뮬레이션할 수 있습니다. 레이아웃 및 제작에 (...)
| 패키지 | 핀 | 다운로드 |
|---|---|---|
| DSBGA (YFQ) | 36 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치