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.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | LP8556 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. M) | PDF | HTML | 10/06/2020 | |
| Informe | Common LED Functions and LED Driver Design Considerations | 21/09/2020 | |||
| Nota sobre la aplicación | Some Guidelines and Tips for the LED Driver Application | 14/08/2019 | |||
| Nota sobre la aplicación | AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) | 14/06/2019 | |||
| Guía de selección | Power Management Guide 2018 (Rev. R) | 25/06/2018 | |||
| Nota sobre la aplicación | Inductor Selection in Boost Converters for LCD Backlight Applications | 24/10/2016 | |||
| Nota sobre la aplicación | Schottky Diode Selection in Asynchronous Boost Converters | 6/09/2016 | |||
| Nota sobre la aplicación | Power Budget for Backlight Drivers | 27/06/2013 | |||
| Nota sobre la aplicación | Increasing Full-Load Efficiency of a Backlight Driver | 5/06/2013 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
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 (...)
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 (...)
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.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Este diseño de referencia describe la solución de alimentación para pantallas LCD en dispositivos portátiles, especialmente en auriculares de realidad aumentada (RA) y realidad virtual (RV). El controlador de retroiluminación de alta precisión de corriente se logra con LP8556, que proporciona una (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| DSBGA (YFQ) | 20 | Ultra Librarian |
| WQFN (RTW) | 24 | Ultra Librarian |
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