UC3902DTRG4 ,Load Share Controller 8-SOIC 0 to 70UC2902 UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011DESCRIPTION (continued)A differential ..
UC3902N ,Load Share ControllerUC2902UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011LOAD SHARE CONTROLLER
UC3902NG4 ,Load Share Controller 8-PDIP 0 to 70FEATURES DESCRIPTION 2.7-V to 20-V OperationThe UC3902 load share controller is an 8-pin 8-Pin Pa ..
UC3903DW ,Quad Supply and Line MonitorELECTRICAL CHARACTERISTICSUnless otherwise stated, these specifications apply for T = –55°C to +125 ..
UC3903DW ,Quad Supply and Line MonitorFEATURES DESCRIPTION• Inputs for Monitoring up to Four SeparateThe UC1903 family of quad supply and ..
UC3903DW ,Quad Supply and Line MonitorBLOCK DIAGRAMNote: Pin numbers refer to J, N and DW packages.1Please be aware that an important not ..
UN9212 ,Silicon NPN epitaxial planer transistorFeaturesn1l Costs can be reduced through downsizing of the equipment and– –reduction of the number ..
UN9212J ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment and12reduction of the number of ..
UN9213 ,Silicon NPN epitaxial planer transistorElectrical Characteristics (Ta=25˚C)nParameter Symbol Conditions min typ max UnitI V = 50V, I = 0 ..
UN9213J ,Composite DeviceElectrical Characteristics T = 25°CaParameter Symbol Conditions Min Typ Max UnitCollector cutoff c ..
UN9214 ,Silicon NPN epitaxial planer transistorAbsolute Maximum Ratings (Ta=25˚C)nParameter Symbol Ratings UnitCollector to base voltage V 50 VCB ..
UN9214J ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector to base voltage V 50 VCBOC ..
uc3902-UC3902D-UC3902DG4-UC3902DTR-UC3902DTRG4-UC3902N-UC3902NG4
Load Share Controller
UC2902
UC3902
SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011
LOAD SHARE CONTROLLER
FEATURES 2.7-V to 20-V Operation 8-Pin Package Requires Minimum Number of ExternalComponents Compatible with Existing Power SupplyDesigns Incorporating Remote OutputVoltage Sensin Differential Share Bus Precision Current Sense Amplifier (40 Gain) UVLO (Undervoltage Lockout) Circuitry User Programmable Share LoopCompensation
APPLICATIONS Paralelled Power Supplies
DESCRIPTIONThe UC3902 load share controller is an 8-pindevice that balances the current drawn fromindependent, paralleled power supplies. Loadsharing is accomplished by adjusting eachsupplies’ output current to a level proportional tothe voltage on a share bus.
The master power supply, which is automaticallydesignated as the supply that regulates to thehighest voltage, drives the share bus with avoltage proportional to its output current. TheUC3902 trims the output voltage of the otherparalleled supplies so that they each support theirshare of the load current. Typically, each supply isdesigned for the same current level although thatis not necessary for use with the UC3902. Byappropriately scaling the current sense resistor,supplies with different output current capabilitycan be paralleled with each supply providing thesame percentage of their output current capabilityfor a particular load.
UDG−01141
40R
ADJ AMPLIFIER
SHARE SENSE AMPLIFIER
SHARE DRIVE AMPLIFIER
2.3 V
35 mV +0.6 V
CURRENT SENSE
AMPLIFIER
ERROR AMPLIFIER
GND
SENSE
ADJ
ADJR
VCC
SHARE+
SHARE−
COMP
