Inicio Administración de potencia Controladores LED Controladores para LED de retroiluminación
Inicio
Administración de potencia
Controladores LED
Controladores para LED de retroiluminación

LP8551

ACTIVO

Controlador de retroiluminación LED de alta eficiencia de cuatro canales para portátiles con nivel l

Haga su pedido ahora
Hoja de datos

LP8551

ACTIVO
Hoja de datos Haga su pedido ahora

Detalles del producto

Number of channels 4 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 10 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 4 Vin (min) (V) 5.5 Vin (max) (V) 22 Vout (min) (V) 10 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 91 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YZR) 25 7.5625 mm² (— mm × — mm)
  • 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
  • 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.

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.
filter Buscar otro/a Controladores para LED de retroiluminación
Descargar Ver vídeo con transcripción Video

Documentación técnica

No se encontraron resultados. Borre su búsqueda y vuelva a intentarlo.
Ver todo 3
Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LP8551 High-Efficiency LED Backlight Driver for Notebooks datasheet (Rev. E) PDF | HTML 2/09/2014
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

Diseño y desarrollo

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.

Controlador o biblioteca

LP8550SW-LINUX — Controlador Linux para LP8550

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
  • (...)
Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
DSBGA (YZR) 25 Ultra Librarian
Se aplican los Términos y condiciones estándar de TI para los elementos de evaluación.

Pedidos y calidad

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

Ver todos los temas del foro en inglés

El contenido lo proporcionan “tal como está” TI y los colaboradores de la comunidad y no constituye especificaciones de TI. Consulte los términos de uso.

Si tiene alguna pregunta sobre calidad, encapsulados o pedido de productos de TI, consulte el servicio de asistencia de TI. ​​​​​​​​​​​​​​

Videos