AN3392 datasheet(46/57 Pages) STMICROELECTRONICS

46 / 57 page

SPV1020 parallel and series connection

AN3392

46/57

Doc ID 018749 Rev 1

Two of the SPV1020s (1st and 3rd) supply most of the voltage drop due to the lower

irradiation on panel 2.

Note:

The SPV1020 is a boost controller, so Voutx must be higher than Vinx, otherwise the

SPV1020 turns off and the input power is transferred to the output stage through the bypass

diode D1 (refer to the schematic in Figure 24).

Example 2:

Panel 2 has 25% more irradiation than panels 1 and 3:

In this case the system is at its limit. A lower irradiation on panel 2 impacts Vout1 and/or

Vout3 which are already delivering as much voltage as possible (40 V), imposed by R3/R4

partitioning.

Example 3:

Panel 2 completely shaded.

In this case the maximum VOUT can be 80 V (Vout1+Vout3).

Diode D2 (refer to schematic in Figure 24) across the 2nd SPV1020 allows Iout to flow.

Iout

Pout

Vout

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

82.5

-----------

0.92A

Vout1

Vout3

0.92

-----------

32.6V

Vout2

22.5

0.92

-----------

24.45V

Vout2

---

Vout1

---

Vout3

⋅

Pout1

Pout2

---Pin1

7.5W

Pout

Pout1

Pout2

Pout3

67.5W

Iout

Pout

Vout

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

67.5

-----------

0.75A

Vout1

Vout3

0.75

-----------

40V

Vout2

7.5

0.75

-----------

10V

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