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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

DESCRIPTION

The 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
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