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參數(shù)資料
| 型號： | UC3904N |
| 英文描述： | Power Supply Supervisor |
| 中文描述： | 電源監(jiān)控 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 171K |
| 代理商： | UC3904N |
UC1902
UC2902
UC3902
PRELIMINARY
SLUS232 - FEBRUARY 1999
FEATURES
2.7V to 20V Operation
8-Pin Package
Requires Minimum Number of
External Components
Compatible with Existing Power
Supply Designs Incorporating Remote
Output Voltage Sensing
Differential Share Bus
Precision Current Sense Amplifier with
Gain of 40
UVLO (Undervoltage Lockout)
Circuitry
User Programmable Share Loop
Compensation
Load Share Controller
1
3
2
4
8
6
7
5
+
–
R
40R
LOAD SHARE CONTROLLER
+
–
ADJ AMPLIFIER
BIAS
UVLO
+
–
+
–
+
–
SHARE SENSE AMPLIFIER
SHARE DRIVE AMPLIFIER
2.3V
35mV
+
0.6V
+
CURRENT SENSE
AMPLIFIER
ERROR AMPLIFIER
GND
SENSE
ADJ
ADJR
VCC
SHARE+
SHARE–
COMP
BLOCK DIAGRAM
UDG-99042
DESCRIPTION
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.
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 ca-
pability 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 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 20
– 100
) to be inserted.
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