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See Technical Specifications

UC3907N

35V load share controller, 0°C to 70°C

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UC3907N
Datasheet:

UC3907N Datasheet (PDF)
Applications:

Load Share Controller
Current - Supply:

6mA
Voltage - Supply:

4.5V ~ 36V
Operating Temperature:

0°C ~ 70°C
EDA/CAD Models:

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UC3907N General Description

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 modules 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.

Key Features

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

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Power Management - Specialized	Series	-
Applications	Load Share Controller	Current - Supply	6mA
Voltage - Supply	4.5V ~ 36V	Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole	Base Product Number	UC3907