LP8551
- High-Voltage DC/DC Boost Converter with Integrated FET;
Four Switching Frequency Options: 156/312/625/1250 kHz - 2.7-V to 22-V Input Voltage Range to Support 1x to 5x Cell
Li-Ion Batteries - 50-mA High-Precision LED Current Sinks
- Adaptive LED Current Sink Headroom Control for Maximum
System Efficiency - Programmable PWM Resolution 8 to 13 Bits
- I2C and PWM Input Duty Cycle Brightness Control
- PWM Output Frequency and LED Current Set Through Resistors
- 4 LED Outputs with LED Fault (short/open) Detection
- Low Input Voltage, Overtemperature, Overcurrent Detection,
and Shutdown - Minimum Number of External Components
The LP8551 is a white LED driver with integrated boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.
The boost converter has adaptive output voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
The LP8551 has safety features which make it possible to detect LED outputs with open or short fault. As well, low input voltage and boost overcurrent conditions are monitored, and chip is turned off in case of these events. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
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 | LP8551 High-Efficiency LED Backlight Driver for Notebooks データシート (Rev. E) | PDF | HTML | 2014年 9月 2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 |
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。
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 (YZR) | 25 | 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
推奨製品には、この TI 製品に関連するパラメータ、評価基板、またはリファレンス デザインが存在する可能性があります。