CAT4026中文资料LED 控制器，6 沟道，具有故障诊断功能数据手册ONSEMI规格书

描述 Description

The CAT4026 is a high performance, large panel LED controller designed to control six constant current high voltage LED strings. Added control circuitry monitors the lowest cathode voltage and generates a feedback control signal to an external Switch Mode Power Supply (SMPS) to provide a low cost and efficient solution for large panel high voltage LED backlighting.Each LED channel current is accurately matched and controlled by sensing an external resistor in series with a low cost bipolar power transistor. This allows current and heat dissipation concerns to be mitigated from the CAT4026 device package.For added system reliability, both Open-Cathode-Anode (OCA) and Shorted-Cathode-Anode (SCA) fault detection circuitry has been included along with independent Fault flag logic outputs for diagnostic purposes.LED current dimming in all six channels can be precisely controlled by either a Pulse Width Modulation signal via the PWM input pin or by an analog dimming voltage applied at the ANLG pin. In addition the ANLG pin provides a convenient method for limiting the overall maximum power dissipation in the event of excessive LED shorting within any LED string.The device will automatically enter low current shutdown mode by taking the PWM pin low for an extended length of time.

特性 Features

• Adaptive Feedback Control to External SMPS for Better Efficiency
• Enhanced power efficiency of the external SMPS
• PWM and Analog Mode Dimming
• Extended range of dimming control
• Open Cathode-Anode (OCA) Fault Protection
• Robustness in case of LED disconnect or large LED string voltage mismatch
• 6 Channel LED Controller
• Short Cathode-Anode (SCA) Fault Protection
• Over-Voltage Protection
• Thermal Shutdown Protection
• Automatic Inactivity Power Down Mode

应用 Application

• LED Backlighting
• LCD TVs

简介

CAT4026属于集成电路（IC）的LED驱动器。由制造生产的CAT4026LED 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。