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| Maxim MAX5952 -48V POE解决方案 | |||||
作者：Maxim 文章来源：Maxim 点击数： 更新时间：2007-11-2  |
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概述： The MAX5952 is a quad -48V power controller designed for use in IEEE 02.3af-compliant/pre-IEEE 802.3at-compatible power-sourcing equipment (PSE). This device provides powered device (PD) discovery, classification, current limit, DC and AC load disconnect detections in compliance with the IEEE 802.3af standard. The MAX5952 is pin compatible with MAX5945/ LTC4258/LTC4259A PSE controllers and provides additional features. The MAX5952 features high-power mode that provides up to 45W per port. The MAX5952 provides instantaneous readout of each port current through the I2C interface. The MAX5952 also provides high-capacitance detection for legacy PDs. The device features an I2C-compatible, 3-wire serial interface, and is fully software configurable and programmable. The class-overcurrent detection function enables system power management to detect if a PD draws more than the allowable current. The MAX5952’s extensive programmability enhances system flexibility, enables field diagnosis, and allows for uses in other applications. The MAX5952 provides four operating modes to suit different system requirements. Auto mode allows the device to operate automatically without any software supervision. Semi-automatic mode automatically detects and classifies a device connected to a port after initial software activation, but does not power up that port until instructed to by software. Manual mode allows total software control of the device and is useful for system diagnostics. Shutdown mode terminates all activities and securely turns off power to the ports. The MAX5952 provides input undervoltage lockout (UVLO), input undervoltage detection, a load-stability safety check during detection, input overvoltage lockout, overtemperature detection, output voltage slewrate limit during startup, power-good status, and fault status. The MAX5952’s programmability includes startup timeout, overcurrent timeout, and load-disconnect detection timeout. The MAX5952 is available in a 36-pin SSOP package and is rated for both extended (-40°C to +85°C) and upper commercial (0°C to +85°C) temperature ranges. 主要特性： IEEE 802.3af Compliant/Pre-IEEE 802.3at Compatible Instantaneous Readout of Port Current Through I2C Interface High-Power Mode Enables Up to 45W Per Port High-Capacitance Detection for Legacy Devices Pin Compatible to MAX5945 and LTC4258/LTC4259A Four Independent Power-Switch Controllers PD Detection and Classification Load-Stability Safety Check During Detection Supports Both DC and AC Load Removal Detections I2C-Compatible, 3-Wire Serial Interface Current Foldback and Duty-Cycle-Controlled Current Limit Open-Drain INT Signal Direct Fast Shutdown Control Capability 应用： Power-Sourcing Equipment (PSE) Switches/Routers Midspan Power Injectors 图1。MAX5952方框图：  图2。MAX5952应用电路图：  图3。 PoE 系统方框图（1）。  图4。 PoE 系统方框图（2）。  图5。 用于VDIG 的-48V 到 +3.3V (300mA) 升压转换器解决方案  图6。典型应用电路（1）（没有AC负载遥控检测）  图6。典型应用电路（2）（带AC负载遥控检测） 详情请见MAX5952数据表： http://datasheets.maxim-ic.com/en/ds/MAX5952.pdf |
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