LP8557
- 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.기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LP8557 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. B) | PDF | HTML | 2015. 12. 18 | |
| 백서 | Common LED Functions and LED Driver Design Considerations | 2020. 9. 21 | |||
| 애플리케이션 노트 | Some Guidelines and Tips for the LED Driver Application | 2019. 8. 14 | |||
| 애플리케이션 노트 | Inductor Selection in Boost Converters for LCD Backlight Applications | 2016. 10. 24 | |||
| 애플리케이션 노트 | Schottky Diode Selection in Asynchronous Boost Converters | 2016. 9. 6 |
설계 및 개발
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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.
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 (...)
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
- (...)
SNVC125 — LP8557 evaluation program
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| DSBGA (YFQ) | 16 | Ultra Librarian |