UC2907DWTRG4 ,Load Share Controller 16-SOIC -40 to 85features to allowmultiple-independent-power modules to be paralleled such that each module supplies ..
UC2907J ,Load Share Controllermaximum ratings over operating free-air temperature (unless otherwise noted)Supply voltage . . . . ..
UC2907N ,Load Share ControllerVREFC/S (+)ISET C/S OUTN/C N/CSTATUS INDICATEOPTO DRIVECURRENT SHARE BUSVCC ..
UC2914DW ,5-35V Single, Hot-Swap IC Industrial Temperature Rangemaximum ratings may cause permanent damage to the device. These are stress ratings only,and functio ..
UC2914DW ,5-35V Single, Hot-Swap IC Industrial Temperature RangePRODUCT PREVIEW SLUS425C − DECEMBER 2003 − REVISED JULY 2004DESCRIPTION (continued)Whe ..
UC2914DWTR ,5-35V Single, Hot-Swap IC Industrial Temperature Rangefeatures a dutyratio current limiting technique, which providespeak load capability while limiting ..
UM91214B , Tone / Pulse Dialer
UM91214B , Tone / Pulse Dialer
UM91215D , Tone / Pulse Dialer
UM91260B , 10 MEMORY TONE /PULSE DIALER
UM91270/A , 20 MEMORY TONE/PULSE DIALER
UM91270A , 20 MEMORY TONE/PULSE DIALER
UC2907DW-UC2907DWG4-UC2907DWTR-UC2907DWTRG4-UC2907J-UC2907N
Load Share Controller
Current Sharing Opto Coupler Driving Capability 1.25% Trimmed Reference Master Status Indication 4.5-V to 35-V Operation
DESCRIPTIONThe 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.
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.
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)C/S (–)
(–) SENSE
POWER RETURN
ARTIFICIAL GND
VREF
ISET
ADJ OUT
ADJ INPUT
COMP
(+) SENSE
VCC
OPTO DRIVE2013212119 10
ADJ OUT
ADJ INPUT
N/C
COMP
(+) SENSE
C/S (–)
(–) SENSE
N/C
POWER RETURN
ARTIFICIAL GND
C/S (+)C/S OUTN/CST
TUS INDICA
CURRENT
SHARE BUS
ISET
N/C
OPT
O DRIVE
VCC
VREF
PLCC-20, LCC-20,
Q OR L PACKAGE
(TOP VIEW)
