ALT80800中文资料Automotive-Grade, Constant-Current 2.0 A PWM Dimmable Synchronous Buck LED Driver数据手册Allegro规格书

描述 Description

The ALT80800 is a compact, high-efficiency, low EMI LED Driver for automotive lighting applications. It is a synchronous buck switching regulator that provides constant-current output to drive high-power LEDs. It integrates both high-side and low-side N-channel DMOS switches for DC-to-DC step-down conversion. Output current is user-selectable by an external current sense resistor, and output voltage is automatically adjusted to drive various numbers of LEDs in a single string.

特性 Features

• 55Vin rating (60V abs max) – Can be used on traditional 12-V automotive, and 24-V trucks, and systems using a pre-boost supply followed by the ALT80800 to drive a high number of LEDs
• Integrated FETs – No need for external FET(s) or Diode as part of the buck conversion, and higher efficiency
• Switching frequency dithering for EMI reduction – pass OEM requirements and minimize associated components
• 5V Vcc can be used to source up to 14mA as a local rail (e.g., power a small uC) – potentially eliminate an LDO
• PWM and Analog dimming options, including control for NTC temperature foldback or LED binning
• Adjustable LED open fault mask setting for low VIN operation (dropout mode)
Typical Applications:Automotive Lighting
• Hi/Lo Beam and Matrix Headlights
• Front and Rear Fog Lights
• Daytime Running Lights
• Turn/stop Lights
• Dimmable Interior Lights
• Other Automotive Lighting Applications

简介

ALT80800属于集成电路（IC）的LED驱动器。由制造生产的ALT80800LED 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。