L6615 STMicroelectronics, L6615 Datasheet - Page 17

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

Figure 16. Offset Trimming
Because of the tolerance of the output voltage, it is not possible to delete completely the effect of the offset
on CGA pin on all the allowed output voltage range: if the trimming operation is performed at V
then on pin CGA the maximum residual voltage will be present at V
To simplify the procedure, the following step-by step process can be used:
REFERENCE
[1] "L6910 - Adjustable step down controller with synchronous rectification" (Datasheet)
[2] "L6911 - 5 bit programmable step down controller with synchronous rectification" (Datasheet
a trimmer has to be placed between sense pins of each section: the value of the trimmer resistance
must be at least one order of magnitude higher than R
( =0.5);
once the application is running at a load defined by the designer based on the required sharing
accuracy, the master section has to be located;
on the slave sections it is then necessary to operate on the trimmer to make equal the output currents.
R
CGA
V
OUT MAX
R
R
CGA
CGA
V
V
OUT
OUT
–
I
I
+V
+V
G
G
V
CGA
CGA
OUT MIN
SENSE
SENSE
CS+
CS+
V
V
R
R
P
P
G
G
+
+
R
R
L6615
L6615
K
K
I
I
R
R
LOAD
LOAD
---------------------------------------------------------------------------- -
SNS
SNS
OPT
G
and it has to be set at one half of its range
1-
1-
_
_
R
R
R
R
R
V
V
K
K
1 2
G
G
K
M
M
CS-
CS-
–
OUT(MAX)
V
V
OUT
OUT
OPT
OPT
–
R
and its value will be:
K
–
R
G
OUT(MIN)
L6615
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