L6615N Просмотр технического описания (PDF) - STMicroelectronics
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L6615N Datasheet PDF : 20 Pages
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L6615
APPLICATION INFORMATION
Index
1. Introduction
2. Current sense section
3. Share drive section, error amplifier and adjust amplifier
4. Designing with L6615
5. Current sense methods
6. Application ideas
7. Low voltage buses
8. Offset Trimming
page
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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
+OUT
+OUT_S
-OUT_S
-OUT
PS #1
+OUT
+OUT_S
-OUT_S
-OUT
PS #N
RSENSE
RADJ
RG1
RG2
1 GND
VCC 8
2 CS-
CGA 7
3 CS+ SHARE 6
4 ADJ
COMP 5
L6615
CC
RC
RSENSE
RADJ
RCGA
RG1
RG2
1 GND
VCC 8
SHARE BUS
2 CS-
CGA 7
3 CS+ SHARE 6
4 ADJ
COMP 5
L6615 CC
RCGA
RC
+OUT
GND
LOAD
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