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UC2902 Datasheet Preview

UC2902 Datasheet

LOAD SHARE CONTROLLER

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UC2902
UC3902
SLUS232E DECEMBER 19, 2002 REVISED JULY 2011
LOAD SHARE CONTROLLER
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.
GND 1
SENSE 2
R
BIAS
40R
+
CURRENT SENSE
AMPLIFIER
ADJ 3
ADJR 4
ADJ AMPLIFIER
+
0.6 V
+
UVLO
SHARE DRIVE AMPLIFIER
+
8 VCC
+ SHARE SENSE AMPLIFIER
35 mV
+
+ ERROR AMPLIFIER
2.3 V
7 SHARE+
6 SHARE
5 COMP
UDG01141
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.
www.ti.com
Copyright © 2002 2008, Texas Instruments Incorporated
1




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UC2902 Datasheet Preview

UC2902 Datasheet

LOAD SHARE CONTROLLER

No Preview Available !

UC2902
UC3902
SLUS232E DECEMBER 19, 2002 REVISED JULY 2011
DESCRIPTION (continued)
A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops
in each power converter’s ground return 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 20 Ω to
100 Ω) to be inserted.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
UC2902
UC3902
UNIT
VCC, ADJ
0.3 to 20
Input voltage range, VI
SENSE
ADJR, COMP
5 to 5
0.3 to 4
V
SHARE, SHARE+
0.3 to 10
Output current, IO
SHARE+
ADJ
100 mA to 10 mA
1 mA to 30 mA
mA
mA
Operating free-air temperature range, TA
40 to 100
Junction temperature range, TJ
Storage temperature, Tstg
55 to 105
65 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Voltages are with respect to
GND. Currents are positive into, and negative out of the specified terminal.
2 www.ti.com


Part Number UC2902
Description LOAD SHARE CONTROLLER
Maker etcTI
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UC2902 Datasheet PDF






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