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Product details

Parameters

Share bus Single-Ended Operating supply current (mA) 6 Startup current (uA) 3000 Operating supply (Min) (V) 4.5 Operating supply (Max) (V) 36 Features On-Board Reference Operating temperature range (C) 0 to 70 open-in-new Find other Load share controllers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Load share controllers

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

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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 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.

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Technical documentation

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Type Title Date
* Datasheet Load Share Controller datasheet (Rev. C) Jan. 09, 2002
User guide UCC39002 Advanced Load-Share Controller User's Guide, HPA027A (Rev. A) Feb. 09, 2004
Application note U-129 UC3907 Load Share IC Simplifies Parallel Power Supply Design Sep. 05, 1999

Design & development

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Hardware development

EVALUATION BOARD Download
99
Description

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 (...)

Features
  • High accuracy, better than 1% current share error at full load
  • High-side current sensing
  • Ultra-low offset current sense amplifier
  • Single wire load-share bus
  • Intel® SSI load-share spcification compliant
  • Disconnect from load-share bus at stand-by
  • Load-share bus protection against shorts to GND or to the (...)

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options

Ordering & quality

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