LX27901ID数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The LX27901 is an extremely versatile high-performance controller for driving LEDs from the HVDC (output) rail of a standard PFC front-end. The controller allows the user to utilize three different converter drive schemes, LLC (resonant), conventional PWM control, and Microsemi’s proprietary synchronous scheme, all selectable by the multi-function ENABLE pin. In non-resonant mode, the controller provides two 180° phase-shifted pulse-width modulated drive signals for implementing various two-switch DC-DC converter topologies, such a half-bridge and asymmetrical forward converter. It can also be used for one-switch topologies. Direct PWM input dimming operation can be realized by inputting a suitable dimming pulse train to the DIM pin. The LX27901 supports analog LED current control utilizing the BRTA pin for setting the analog LED current. In addition, a proprietary dimming algorithm ACU_BRITE® is incorporated. The controller integrates the pulsed LED current and compares it with a reference for very accurate brightness control irrespective of duty cycle. The LX27901 is designed to operate with Microsemi’s proprietary lossless (magnetic) current balancing schemes. See more at   LX27901 Application Note for LED Backlight.document.write( String.fromCharCode(60)+'style type=\"text/css\">div#slider_slide_1____202___-1 { display: block !important; }'+String.fromCharCode(60)+'/style>' );document.write( ''+String.fromCharCode(60)+'style type=\"text/css\">div.slider_content_inactive { display: none; }.slider_title { display: none !important; }'+String.fromCharCode(60)+'/style>' );LX27901 NewsLX27901 Newsdocument.getElementById('slider_container_1____202___').setAttribute( 'class', document.getElementById('slider_container_1____202___').className.replace(/\\bslider_noscript\\b/,'') );Microsemi Backlighting Solutions Adopted by VIZIOMicrosemi Delivers New LED Driver for LCD Televisions

特性 Features

·LLC, PWM and proprietary synchronous modes to drive the LED strings
·LED strings can be dimmed by PWM or analog methods
·Proprietary algorithm to provide accurate brightness control at high efficiency over wide dimming duty cycle range
·Accurate parallel LED strings current matching using Microsemi’s patented non-dissipative current-balancing technology
·Robust protection from open or shorted LED conditions
·Dedicated fault indication
·0.8A Source & Sink Drive Capability
·On Chip 5.25V Regulator
·Direct connection to input voltage rail up to 27V
·Synchronous regulation function to minimize power conversion stage
  ROHS, PB Free

简介

LX27901ID属于集成电路（IC）的LED驱动器。由制造生产的LX27901IDLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。