L6615 STMicroelectronics, L6615 Datasheet - Page 14

• Manufacturer Part Number: L6615
• Description: High/low side load share controller
• Manufacturer: STMicroelectronics

L6615
Figure 13. Current sense methods.
6
In fig. 14 is showed a single section of a system in which several DC to DC modules can be paralleled,
typical solution whenever the load requires high current at low voltage; the converter is designed for a step
down configuration using a synchronous rectification controller (for example L6910 [1] or L6911 [2] ST de-
vice).
The L6615 reads the drop across the Rds(ON) of the OR-ing FET and the LM293 drives its gate, pulling
it down whenever a fault condition (e.g. short on the low side) appears.
A charge pump could be necessary to be sure that the ORing FET V
on the input and output voltage).
Figure 14. 0.9 to 5V DC-Dc converter with Current Sharing and output hot-pluggability
14/20
POWER
POWER
SUPPLY
SUPPLY
APPLICATION IDEAS
R
R
G
G
CS+
CS+
I
I
OUT
OUT
GND
GND
SS
SS
COMP
COMP
VCC
VCC
L6615
L6615
BOOT
BOOT
R
R
L6910
L6910
SNS
SNS
a)
PHASE
PHASE
UGATE
UGATE
LGATE
LGATE
CS-
CS-
PGND
PGND
VFB
VFB
R
R
G
G
O
O
A
A
D
D
L
L
POWER
POWER
SUPPLY
SUPPLY
R1
R1
R
R
I
I
OUT
OUT
G
G
Q1
Q1
CS+
CS+
ORing FET
ORing FET
CONTROL
CONTROL
VIN
VIN
L6615
L6615
GATE
GATE
b)
CS-
CS-
R
R
G
G
O
O
D
D
L
L
A
A
GND
GND
ADJ
ADJ
8
8
1:N
1:N
COMP
COMP
5
5
CS+
CS+
LM293
LM293
GS
L6615
L6615
is higher than V
1:N
1:N
7
7
CGA
CGA
CS-
CS-
4
4
6
6
SH
SH
Vcc
Vcc
c)
R
R
SNS
SNS
GS(TH)
R
R
I
I
R
R
OUT
OUT
G
G
G
G
(depending
CS+
CS+
CS-
CS-
O
O
A
A
D
D
L
L
VIN
VIN
L6615
L6615
SENSING
SENSING
+S_OUT
+S_OUT
CIRCUIT
CIRCUIT
-SOUT
-SOUT
SH
SH
P_GND
P_GND
VOUT
VOUT