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L6615D Arkusz danych(PDF) 8 Page - STMicroelectronics

Numer części L6615D
Szczegółowy opis  HIGH/LOW SIDE LOAD SHARE CONTROLLER
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6615D Arkusz danych(HTML) 8 Page - STMicroelectronics

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L6615
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APPLICATION INFORMATION
Index
page
1.
Introduction
8
2.
Current sense section
9
3.
Share drive section, error amplifier and adjust amplifier
10
4.
Designing with L6615
10
5.
Current sense methods
13
6.
Application ideas
14
7.
Low voltage buses
15
8.
Offset Trimming
16
1
INTRODUCTION
Power supply systems are often designed by paralleling converters in order to improve performance and
reliability.
To ensure uniform distribution of stresses, the total load current should be shared appropriately among
the converters.
A typical application is showed in fig. 9 for a series of N paralleled modules (PS#1 to PS#N): each of them
exhibits 4 terminals: two for the power output (+OUT, -OUT) and two for the remote sense signals
(+OUT_S, -OUT_S).
On the power lines are placed the sense resistors RSENSE (for the current sensing) and the OR-ing diodes
(to avoid that the failure of one module shorts the load out)
L6615 allows attaining an automatic master-slave current sharing architecture: one L6615 is associated to each
power supply and all these IC's are linked each other through the share bus (referred to the common ground).
This kind of system configuration is preferred to the systems in which a single current sharing controller is
used because of robustness, reliability and flexibility.
To configure a load share controller, few passive components are used. A brief device explanation will
follow with the formulas useful to set these external components.
Figure 9. Typical high side connection
CS-
CGA
CS+
VCC
ADJ
SHARE
GND
COMP
3
2
4
1
5
6
7
8
L6615
+OUT
GND
PS #1
C
C
R
C
R
CGA
R
ADJ
R
SENSE
CS-
CGA
CS+
VCC
ADJ
SHARE
GND
COMP
3
2
4
1
5
6
7
8
L6615
+OUT
+OUT_S
-OUT_S
-OUT
PS #N
C
C
R
C
R
CGA
R
ADJ
R
SENSE
+OUT
+OUT_S
-OUT_S
-OUT
R
G1
R
G2
R
G1
R
G2
SHARE BUS
LOAD
CS-
CGA
CS+
VCC
ADJ
SHARE
GND
COMP
3
2
4
1
5
6
7
8
L6615
+OUT
GND
PS #1
C
C
R
C
R
CGA
R
ADJ
R
SENSE
CS-
CGA
CS+
VCC
ADJ
SHARE
GND
COMP
3
2
4
1
5
6
7
8
L6615
+OUT
+OUT_S
-OUT_S
-OUT
PS #N
C
C
R
C
R
CGA
R
ADJ
R
SENSE
+OUT
+OUT_S
-OUT_S
-OUT
R
G1
R
G2
R
G1
R
G2
SHARE BUS
LOAD


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