BCR421UFD中文资料linear-led-drivers数据手册Diodes规格书

描述 Description

The BCR420UFD and BCR421UFD monolithically integrate transistors, diodes and resistors to function as a Constant Current Regulator (CCR) for linear LED driving. The device regulates with a preset 10mA nominal that can be adjusted with an external resistor up to 350mA. It is designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control, it can be used in multiple applications, as long as the maximum supply voltage to the device is < 40V.

With the low-side control, the BCR421UFD has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 25kHz by a microcontroller for LED dimming.

With no need for additional external components, this CCR is fully integrated into a 2x2x0.6mm package (U-DFN2020-6) minimizing PCB area, off-board height, and component count.

特性 Features

•LED Constant Current Regulator Using NPN Emitter-Follower with Emitter Resistor to Current Limit
•IOUT – 10mA ±10% Constant Current (Preset)
•IOUT up to 350mA Adjustable with an External Resistor (BCR421U)
•VOUT – 40V Supply Voltage
•PD up to 1.7W in U-DFN2020-6 Package
•6mm Height for Low-Profile Edge Lighting
•Low-Side Control Enabling PWM Input < 25kHz (BCR421U)
•Negative Temperature Coefficient (NTC) Reduces IOUT with Increasing Temperature
•Parallel Devices to Increase Regulated Current
•Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
•Halogen and Antimony Free. “Green” Device (Note 3)
•Automotive-compliant parts are available under separate datasheet (BCR420UFDQ/BCR421UFDQ)

应用 Application

Constant Current Regulation (CCR) in:


• Edge lighting strips

• Emergency lighting

• Signage, advertising, and decorative/architectural lighting

• Retail lighting in fridges, freezer cases, and vending machines

简介

BCR421UFD属于集成电路（IC）的LED驱动器。由制造生产的BCR421UFDLED 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。