UC3902 - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

UC3902
Manufacturer

TI
ChipWorker Part#

CW435539037
RoHS

Lead free / RoHS Compliant
Description

Load Share Controller
Documentation

Datasheet

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UC3902 Specifications

Attribute	Attribute Value

Part Number	UC3902
Manufacturer	TI
ChipWorker Part#	CW435539037
Documentation	Datasheet
	expand all
RoHS	RoHS Compliant
Lead-Free Status	Lead Free

Product Description

The UC3902 load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies output current to a level proportional to the voltage on a share bus.
The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load.
A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converters ground return line. Trimming of each converters output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted.
2.7-V to 20-V Operation
8-Pin Package
Requires Minimum Number of External Components
Compatible with Existing Power Supply Designs
Incorporating Remote Output Voltage Sensin
Differential Share Bus
Precision Current Sense Amplifier (40 Gain)
UVLO (Undervoltage Lockout) Circuitry
User Programmable Share Loop Compensation
APPLICATIONS
Paralelled Power Supplies

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