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MAX253 變壓器驅(qū)動器，用于隔離型RS-485接口

2008-11-27 15:38www.elecfans.co 本站我要評論（0）我要收藏

MAX253 變壓器驅(qū)動器，用于隔離型RS-485接口

MAX253 概述

The MAX253 is a monolithic oscillator/power-driver, specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. It drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.

The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches.

The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.

MAX253 pdf datasheet

MAX253 關(guān)鍵特性

  • Power-Supply Transformer Driver for Isolated RS-485/RS-232 Data-Interface Applications
  • Single +5V or +3.3V Supply
  • Low-Current Shutdown Mode: 0.4µA
  • Pin-Selectable Frequency: 350kHz or 200kHz
  • 8-Pin DIP, SO, and µMAX Packages

    MAX253 應(yīng)用/使用

     橋接地電位差
     高噪聲抑制通信接口
     隔離型和/或高壓電源
     隔離型RS-485/RS-232電源
     醫(yī)療裝置
     過程控制
     變壓器驅(qū)動器

    MAX253應(yīng)用電路

    MAX253：典型工作電路

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