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UC2907J Datasheet(PDF) 1 Page - Texas Instruments |
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UC2907J Datasheet(HTML) 1 Page - Texas Instruments |
1 / 12 page UC1907, UC2907, UC3907 LOAD SHARE CONTROLLER SLUS165C – MARCH 1999 - REVISED JANUARY 2002 1 www.ti.com FEATURES D Fully Differential High Impedance Voltage Sensing D Accurate Current Amplifier for Precise Current Sharing D Opto Coupler Driving Capability D 1.25% Trimmed Reference D Master Status Indication D 4.5-V to 35-V Operation 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. Copyright 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 C/S OUT C/S (+) C/S (–) (–) SENSE POWER RETURN ARTIFICIAL GND VREF ISET STATUS INDICATE CURRENT SHARE BUS ADJ OUT ADJ INPUT COMP (+) SENSE VCC OPTO DRIVE DIL-16 J or N PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 C/S OUT C/S (+) C/S (–) (–) SENSE POWER RETURN ARTIFICIAL GND VREF ISET STATUS INDICATE CURRENT SHARE BUS ADJ OUT ADJ INPUT COMP (+) SENSE VCC OPTO DRIVE SOIC-16 DW PACKAGE (TOP VIEW) 19 20 1 32 17 18 16 15 14 13 12 11 9 10 5 4 6 7 8 ADJ OUT ADJ INPUT N/C COMP (+) SENSE C/S (–) (–) SENSE N/C POWER RETURN ARTIFICIAL GND PLCC-20, LCC-20, Q OR L PACKAGE (TOP VIEW) |
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