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UC1907 датащи(PDF) 6 Page - Texas Instruments

номер детали UC1907
подробное описание детали  LOAD SHARE CONTROLLER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1907 датащи(HTML) 6 Page - Texas Instruments

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UC1907, UC2907, UC3907
LOAD SHARE CONTROLLER
SLUS165C – MARCH 1999 - REVISED JANUARY 2002
6
www.ti.com
pin assignments
Adjust Amplifier: (Pins 13, 14, 15) This amplifier adjusts the individual module’s reference voltage to maintain
equal-current sharing. It is a transconductance type in order that its bandwidth may be limited and noise kept out of
the reference-adjust circuitry, with a simple capacitor to ground. The function of this amplifier is to compare its own
module-output current to the share-bus signal, which represents the highest output current. This will force an adjust
command which is capable of increasing the reference voltage as seen by the voltage amplifier by as much as 100
mV. This number stems from the 17.5:1 internal resistor ratio between the adjust amplifier’s clamped output and the
reference, and represents a 5% total range of adjustment. This value should be adequate to compensate for
unit-to-unit reference and external-resistor tolerances. The adjust amplifier has a built-in 50-mV offset on its inverting
input which will force the unit acting as the master to have a low output, resulting in no change to the reference. While
this 50-mV offset represents an error in current sharing, the gain of the current amplifier reduces it to only 2.5 mV
across the current-sense resistor. It should also be noted that when the module is acting independently with no
connection to the share bus node, or when the share bus node is shorted to ground, its reference voltage will be
unchanged. Since only the circuit acting as a master will have a low output from the adjust amplifier, this signal is used
to activate a flag output to identify the master, should some corrective action be needed.
Status Indicate: (Pin 16) This pin is an open-collector output intended to indicate the unit which is acting as the
master. It achieves this by sensing when the adjust amp is in its low state and pulling the status-indicate pin low.
additional information
Please refer to additional application information.
1.
By Mark Jordan, UC3907 Load Share IC Simplifies Parallel Power Supply Design, TI Literature Number
SLUA147.
2.
By Laszlo Balogh, UC3902 Load Share Controller and its Performance in Distributed Power Systems, TI
Literature Number SLUA128.
UDG-94103
Figure 1. Load System Diagram


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