17/20

L6615

Figure 16. Offset Trimming

Because of the tolerance of the output voltage, it is not possible to delete completely the effect of the offset

To simplify the procedure, the following step-by step process can be used:

s

a trimmer has to be placed between sense pins of each section: the value of the trimmer resistance

(

δ=0.5);

s

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;

s

on the slave sections it is then necessary to operate on the trimmer to make equal the output currents.

REFERENCE

[1] "L6910 - Adjustable step down controller with synchronous rectification" (Datasheet)

[2] "L6911 - 5 bit programmable step down controller with synchronous rectification" (Datasheet

I

LOAD

L6615

CS-

CS+

R

CGA

CGA

R

G

R

G

δ R

K

(1-δ) R

K

V

V

OUT

+

_

R

SNS

I

G

V

M

V

P

I

LOAD

L6615

CS-

CS+

R

CGA

CGA

R

G

R

G

δ R

K

(1-δ) R

K

V

V

OUT

+

_

R

SNS

I

G

V

M

V

P

R

CGA

V

OUT MAX

()

–

()

12

δ

OPT

⋅

–

δ

OPT

R

K

δ

OPT

R

K

–

R

G

–

⋅

()

⋅

-----------------------------------------------------------------------------

⋅⋅