ADI ADu347x四路带PWM控制和变压器驱动数字隔离方案.docxVIP

ADI ADuM347x四路带PWM控制和变压器驱动数字隔离方案 关键字：工业控制,过程控制,传感器 ADI公司的ADuM347x是四路带PWM控制和变压器驱动数字隔离器，采用ADI的iCoupler技术，器件的DC/DC转换器提供高达2W的输出，5.0V或3.3V输入输出电压从3.3V到24V, 200 kHz 到1 MHz可调频率，主要用在RS-232/RS-422/RS-485收发器，工业现存总线隔离，绝缘传感器接口和过程控制等．本文介绍了ADuM347x主要特性，功能方框图，I/O通路框图以及单电源与正和不稳压负电源的应用电路图，所用变压器参考设计．The ADuM347xdevices are quad-channel, digital isolators with an integrated PWM controller and transformer driver for an isolated dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler technology, the dc-to-dc converter provides up to 2 W of regulated, isolated power at 3.3 V to 24 V from a 5.0 V input supply or from a 3.3 V supply. This eliminates the need for a separate, isolated dc-to-dc converter in 2 W isolated designs.The iCoupler chip-scale transformer technology is used to isolate the logic signals, and the integrated transformer driver with isolated secondary side control provides higher efficiency for the isolated dc-to-dc converter. The result is a small form factor, total isolation solution.The ADuM347x isolators provide four independent isolation channels in a variety of channel configurations and data rates.?ADuM347x主要特性：Isolated PWM ControllerIntegrated transformer driverRegulated adjustable output: 3.3 V to 24 V2 W output power70% efficiency at guaranteed load of 400 mA at 5.0 V outputQuad dc-to-25 Mbps (NRZ) signal isolation channels20-lead SSOP packageHigh temperature operation: 105℃High common-mode transient immunity: 25 kV/μs200 kHz to 1 MHz adjustable oscillator frequencySoft start function at power-upPulse-by-pulse overcurrent protectionThermal shutdown2500 V rms isolationADuM347x 应用：RS-232/RS-422/RS-485 transceiversIndustrial field bus isolationPower supply startup bias and gate drivesIsolated sensor interfacesAO-Electronics 傲壹电子 官网： HYPERLINK 中文网： HYPERLINK Process controls图１．ADuM347x功能方框图图２．ADuM347x I/O通路框图图３．ADuM347x单电源应用电路图图４．ADuM347x正和不稳压负电源应用电路图变压器参考设计