L6615D STMicroelectronics, L6615D Datasheet - Page 8

• Manufacturer Part Number: L6615D
• Description: IC CTRLR LOAD SHARE HI/LO 8-SOIC
• Manufacturer: STMicroelectronics

Specifications of L6615D

• Applications: Power Supplies, Converters, Controllers
• Current - Supply: 5mA
• Voltage - Supply: 2.7 V ~ 22 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• For Use With: 497-5498 - EVAL BOARD FOR L6615
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6615
APPLICATION INFORMATION
Index
1
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 R
(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
8/20
INTRODUCTION
1.
2.
3.
4.
5.
6.
7.
8.
Introduction
Current sense section
Share drive section, error amplifier and adjust amplifier
Designing with L6615
Current sense methods
Application ideas
Low voltage buses
Offset Trimming
PS #N
PS #N
PS #1
PS #1
+OUT_S
+OUT_S
-OUT_S
-OUT_S
+OUT_S
+OUT_S
-OUT_S
-OUT_S
+OUT
+OUT
+OUT
+OUT
-OUT
-OUT
-OUT
-OUT
R
R
R
R
R
R
R
R
SENSE
SENSE
G1
G1
SENSE
SENSE
G1
G1
R
R
R
R
G2
G2
1
1
2
2
3
3
4
4
G2
G2
1
1
2
2
3
3
4
4
GND
GND
CS-
CS-
CS+
CS+
ADJ
ADJ
GND
GND
CS-
CS-
CS+
CS+
ADJ
ADJ
L6615
L6615
L6615
L6615
R
R
R
R
ADJ
ADJ
ADJ
ADJ
SHARE
SHARE
SHARE
SHARE
COMP
COMP
COMP
COMP
VCC
VCC
CGA
CGA
SENSE
CGA
CGA
VCC
VCC
7
7
8
8
8
8
7
7
6
6
5
5
6
6
5
5
C
C
C
C
R
R
R
R
C
C
C
C
C
C
C
C
(for the current sensing) and the OR-ing diodes
SHARE BUS
SHARE BUS
R
R
R
R
CGA
CGA
CGA
CGA
+OUT
+OUT
GND
GND
LOAD
LOAD
10
10
13
14
15
16
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