UC2902D ,Load Share ControllerUC2902 UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011
UC2902DG4 ,Load Share Controller 8-SOIC -40 to 85FEATURES DESCRIPTION 2.7-V to 20-V OperationThe UC3902 load share controller is an 8-pin 8-Pin Pa ..
UC2902DTR ,Load Share ControllerUC2902 UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011
UC2902N ,Load Share ControllerUC2902UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011LOAD SHARE CONTROLLER
UC2902N ,Load Share ControllerELECTRICAL CHARACTERISTICS T = –40°C to 105°C, (unless otherwise noted)JPARAMETER TEST CONDITIONS ..
UC2902N ,Load Share ControllerUC2902 UC3902SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011DESCRIPTION (continued)A differential ..
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
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UC2902D-UC2902DG4-UC2902DTR-UC2902N
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
