MAX253 变压器驱动器，用于隔离型RS-485接口

MAX253 变压器驱动器，用于隔离型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 关键特性

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 应用/使用

 桥接地电位差
 高噪声抑制通信接口
 隔离型和/或高压电源
 隔离型RS-485/RS-232电源
 医疗装置
 过程控制
 变压器驱动器

MAX253应用电路