UC3902J

更新时间： 2024-11-25 13:15:07

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
6页	149K
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中文翻译

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数据手册

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UC3902J 数据手册

UC1902

UC2902

UC3902

PRELIMINARY

Load Share Controller

FEATURES

DESCRIPTION

• 2.7V to 20V Operation

The UC3902 load share controller is an 8-pin device that balances the cur-

rent drawn from independent, paralleled power supplies. Load sharing is

accomplished by adjusting each supply’s output current to a level propor-

tional to the voltage on a share bus.

• 8-Pin Package

• Requires Minimum Number of

External Components

The master power supply, which is automatically designated as the supply

that regulates to the highest voltage, drives the share bus with a voltage

• Compatible with Existing Power

Supply Designs Incorporating Remote proportional to its output current. The UC3902 trims the output voltage of

Output Voltage Sensing

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 ca-

pability can be paralleled with each supply providing the same percentage

of their output current capability for a particular load.

• Differential Share Bus

• Precision Current Sense Amplifier with

Gain of 40

• UVLO (Undervoltage Lockout)

Circuitry

A differential line is used for the share bus to maximize noise immunity and

accommodate different voltage drops in each power converter’s ground re-

turn line. Trimming of each converter’s output voltage is accomplished by

injecting a small current into the output voltage sense line, which requires a

small resistance (typically 20Ω – 100Ω) to be inserted.

• User Programmable Share Loop

Compensation

BLOCK DIAGRAM

LOAD SHARE CONTROLLER

GND

VCC

BIAS

UVLO

–

SHARE DRIVE AMPLIFIER

40R

SENSE

–

SHARE+

SHARE–

CURRENT SENSE

AMPLIFIER

SHARE SENSE AMPLIFIER

–

ERROR AMPLIFIER

ADJ

35mV

–

0.6V

ADJ AMPLIFIER

COMP

–

2.3V

ADJR

UDG-99042

SLUS232 - FEBRUARY 1999

12 3 4 5 6

中文翻译

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