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
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MAX253 变压器驱动器,用于隔离型RS-485接口
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