The UCx907 family of load share controller ICs provides all the necessary features to allow multiple-independent-power modules to be paralleled such that each module supplies only its proportionate share to total-load current.

This sharing is accomplished by controlling each module’s power stage with a command generated from a voltage-feedback amplifier whose reference can be independently adjusted in response to a common-share-bus voltage. By monitoring the current from each module, the current share bus circuitry determines which paralleled module would normally have the highest output current and, with the designation of this unit as the master, adjusts all the other modules to increase their output current to within 2.5% of that of the master.

The current share bus signal interconnecting all the paralleled modules is a low-impedance, noise-insensitive line which will not interfere with allowing each module to act independently should the bus become open or shorted to ground. The UC3907 controller will reside on the output side of each power module and its overall function is to supply a voltage feedback loop. The specific architecture of the power stage is unimportant. Either switching or linear designs may be utilized and the control signal may be either directly coupled or isolated though the use of an optocoupler or other isolated medium.

Other features of the UC3907 include 1.25% accurate reference: a low-loss, fixed-gain current-sense amplifier, a fully differential, high-impedance voltage sensing capability, and a status indicator to designate which module is performing as master.

• Fully Differential High Impedance Voltage Sensing
• Accurate Current Amplifier for Precise Current Sharing
• Opto Coupler Driving Capability
• 1.25% Trimmed Reference
• Master Status Indication
• 4.5-V to 35-V Operation

• Topology
• Flyback, Buck
• Features
• Load Sharing, 1.25% Reference, Differential Voltage sensing, Precision current sharing
• Operating temperature range (C)
• -40 to 85

UC2907的完整型号有：UC2907DW、UC2907DWTR、UC2907N，以下是这些产品的关键参数及官网采购报价：

UC2907DW，工作温度：-40 to 85，封装：SOIC (DW)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2907DW的批量USD价格：2.945（1000+）

UC2907DWTR，工作温度：-40 to 85，封装：SOIC (DW)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2907DWTR的批量USD价格：2.555（1000+）

UC2907N，工作温度：-40 to 85，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网UC2907N的批量USD价格：3.237（1000+）

UCC39002EVM — UCC39002 评估模块

The UCC39002 is an advanced, high-performance load-share controller that provides all the necessary functions to parallel multiple independent power supplies or dc-to-dc modules. This load-share circuit is based upon the automatic master/slave architecture utilized in the UC3902 and UC3907 (...)