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.
技術資料
種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
---|---|---|---|---|---|---|
* | データシート | LP8555 High-Efficiency LED Backlight Driver for Tablet PCs データシート | PDF | HTML | 2014年 2月 21日 | ||
ホワイト・ペーパー | Common LED Functions and LED Driver Design Considerations.. | 英語版 | 2020年 9月 21日 | |||
アプリケーション・ノート | Some Guidelines and Tips for the LED Driver Application | 2019年 8月 14日 | ||||
ユーザー・ガイド | Using the LP8555 Evaluation Module | 2014年 2月 21日 |
設計および開発
その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。
LP8555EVM — 高効率 LED バックライト・ドライバ評価モジュール
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 — LP8550 向け Linux ドライバ
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 Design / シミュレーション・ツール向け PSpice®
設計とシミュレーション向けの環境である PSpice for TI (...)
パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
---|---|---|
DSBGA (YFQ) | 36 | Ultra Librarian |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 使用原材料
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点