MP3397数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The MP3397 is a step-up controller with 4 current channels designed to drive WLED arrays for large-size LCD-panel backlighting applications. The MP3397 is flexible, and can expand the number of LED channels with two or more MP3397s in parallel operating from a single inductive power source. The MP3397 uses current-mode fixed-frequency architecture. An external resistor sets the switching frequency. This signal drives an external MOSFET to boost up the output voltage from 5V to a 28V input supply. The MP3397 regulates the current in each LED string to the programmed value set by an external current-setting resistor. The MP3397 applies 4 internal current sources for current balance. The current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss and improves efficiency. An external PWM input signal or DC input signal controls PWM dimming. The dimming PWM signal can be generated internally and the dimming frequency is programmed by an external setting capacitor.

特性 Features

● 4-String, Max 350mA/String at 10% DPWM
● 5V to 28V Input Voltage Range
● 2.5% Current Matching Accuracy Between Strings
● Programmable Switching Frequency
● PWM or DC Input Burst PWM Dimming
● Open and Short LED Protection
● Programmable Over-Voltage Protection
● Cascading Capability with a Single Power Source
● Under-Voltage Lockout
● Thermal Shutdown
● 16-pin SOIC Package

简介

MP3397属于集成电路（IC）的LED驱动器。由制造生产的MP3397LED 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。