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UC2902DG4 Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce UC2902DG4
Description  LOAD SHARE CONTROLLER
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2902DG4 Fiches technique(HTML) 1 Page - Texas Instruments

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UC2902
UC3902
SLUS232E − DECEMBER 19, 2002 − REVISED JULY 2011
LOAD SHARE CONTROLLER
1
www.ti.com
FEATURES
D 2.7-V to 20-V Operation
D 8-Pin Package
D Requires Minimum Number of External
Components
D Compatible with Existing Power Supply
Designs Incorporating Remote Output
Voltage Sensin
D Differential Share Bus
D Precision Current Sense Amplifier (40 Gain)
D UVLO (Undervoltage Lockout) Circuitry
D User Programmable Share Loop
Compensation
APPLICATIONS
D Paralelled Power Supplies
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.
UDG−01141
1
3
2
4
8
6
7
5
+
R
40R
+
ADJ AMPLIFIER
BIAS
UVLO
+
+
+
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
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2002 − 2008, Texas Instruments Incorporated


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