GUI para el módulo de evaluación (EVM)
LM36274
Controlador de retroiluminación integrada con polarización de LCD
Hoja de datos
LM36274
- Drives up to Four Parallel White LED Strings
(29-V Maximum VOUT) - 11-Bit Exponential and Linear Dimming Control
- PWM and I2C Brightness Control
- Backlight Operation With 4.7-µH to 15-µH Inductor
- Backlight and LCD Bias Efficiency up to 92%
- Programmable LCD Bias Voltages (±4 V to ±6.5 V With 50-mV resolution) With Up to 80-mA per Output
- 0.2% Matched LED Current From 60 µA to 30 mA
- 1% Accurate LED Current From 60 µA to 30 mA
- 2.7-V to 5-V Input Voltage Range
The LM36274 is an integrated four-channel WLED driver and LCD bias supply. The ultra-compact size, high efficiency, high level of integration, and programmability allow the LM36274 to address a variety of applications without the need for hardware changes while minimizing the overall solution area.
The backlight boost provides the power to bias four parallel LED strings with up to 29-V total output voltage. The 11-bit LED current is programmable via the I2C bus and/or controlled via a logic level PWM input from 60 µA to 30 mA. Each LED string can be independently enabled or disabled to provide zone dimming capabilities. The backlight boost can be operated efficiently with an inductance range from 4.7 µH to 15 µH, allowing for efficiency and solution size optimization.
The LCD bias boost provides the power to both a positive LDO and an inverting charge pump. Both positive and negative bias supplies have programmable output voltages of ±4 V to ±6.5 V with 50-mV steps and up to ±80 mA of current capability. An auto-sequencing feature provides a programmed delay from positive to negative bias activation, with additional programmable voltage slew rate control. Two wake-up modes allow both bias outputs to be controlled with a single external signal and stay active while consuming very low quiescent current.
Documentación técnica
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Ver todo 9 | Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | Four-Channel LCD Backlight Driver With Integrated Bias Power datasheet (Rev. D) | PDF | HTML | 02 mar 2018 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 sep 2020 | ||
| Application note | How to Use LM3627x to Design DPU in Smartphones | 07 may 2020 | ||
| Application note | LM3627x Layout Guidelines | 12 oct 2017 | ||
| Application note | Analog PWM Dimming in White-LED Drivers | 21 dic 2016 | ||
| Application note | Inductor Selection in Boost Converters for LCD Backlight Applications | 24 oct 2016 | ||
| Application note | Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight | 14 oct 2016 | ||
| Application note | Schottky Diode Selection in Asynchronous Boost Converters | 06 sep 2016 | ||
| EVM User's guide | Using the LM36274EVM Evaluation Module | 08 feb 2016 |
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.
Placa de evaluación
LM36274EVM — Módulo de evaluación de inversor con bomba de carga regulado (LM36274)
The LM36274EVM aids in evaluation of the LM36274 integrated LED driver and LCD bias supply. The backlight boost provides the power to bias four parallel LED strings with up to 29-V total output voltage and up to 30 mA/string. The 11-bit LED current is programmable via the I2C bus and/or controlled (...)
Guía del usuario: PDF
Herramienta de simulación
PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| DSBGA (YFF) | 24 | Ultra Librarian |
Pedidos y calidad
Información incluida:
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
Información incluida:
- Lugar de fabricación
- Lugar de ensamblaje
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