UC3902中文资料具有 0°C 至 70°C 工作温度范围的 20V 负载共享控制器数据手册TI规格书

描述 Description

The UC3902 load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies’ output current to a level proportional to the voltage on a share bus.

The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load.

A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground return line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted.

特性 Features

• 2.7-V to 20-V Operation
• 8-Pin Package
• Requires Minimum Number of External Components
• Compatible with Existing Power Supply Designs Incorporating Remote Output Voltage Sensin
• Differential Share Bus
• Precision Current Sense Amplifier (40 Gain)
• UVLO (Undervoltage Lockout) Circuitry
• User Programmable Share Loop Compensation
• APPLICATIONS
• Paralelled Power Supplies

简介

UC3902属于集成电路（IC）的电源管理-专用。由TI制造生产的UC3902电源管理 - 专用专用型电源管理集成电路 (PMIC) 用于电源的控制或操作，适合特定或小范围的目标应用，例如汽车气囊管理、电容器组平衡、AC 公共电力监控、存储器总线端接、接地故障检测、能量收集、小型引擎管理、处理器或芯片集专用电压调节、负载突降保护、触觉驱动器、热电制冷器控制等。