DocID18265 Rev 8

23/25

AN3319

SPV1040 parallel and series connection

Example 2:

Panel 2 has 50 % irradiation of panels 1 and 3:

In this case the system is close to its maximum voltage limit, in fact, a lower irradiation on

panel 2 impacts V

OUT1

and/or V

OUT3

which are very close to the maximum output voltage

threshold (4.8 V) imposed by R

1

/R

2

partitioning.

Example 3:

Panel 2 completely shaded.

In this case the maximum V

OUT

can be 9.6 V (V

OUT1

+V

OUT3

).

The current flow is guaranteed by the body diodes of the power MOSFETs integrated in the

SPV1040 (or by the bypass diodes, if any, placed between V

OUT-

and V

OUT+

).

P

OUT 1

P

OU T 3

1W

==

P

OU T 2

1

2

--- P

OUT 1

1

2

--- P

OU T 3

⋅

=

⋅

=

P

OUT 2

1

2

---P

OUT 1

0.5 W

==

P

OU T

P

OU T 1

P

OU T 2

P

OU T 3

2.5 W

=

++

=

I

OU T

P

OU T

V

OU T

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

2.5

12

--------

0.21 A

=

=

=

V

OU T 1

V

OUT 3

1

0.21

-----------

4.76 V

=

=

=

V

OU T 2

0.5

0.21

-----------

2.38 V

=

=