LP8556
- 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.
기술 자료
| 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.
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 (...)
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 (...)
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 (...)
TIDA-01635 — 90Hz 재생률의 가상/증강 현실 디스플레이를 위한 백라이트 및 LCD 바이어스 레퍼런스 설계
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YFQ) | 20 | Ultra Librarian |
| WQFN (RTW) | 24 | Ultra Librarian |
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
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.