DocID022816 Rev 2

5/19

AN4050

SPV1040 operation description

plotting the product V*I for each voltage generated. For further details of the MPPT

algorithm, please refer to the SPV1040 datasheet.

Figure 4. MPPT working principle

Figure 5. SPV1040 internal block diagram

The duty cycle set by the MPPT algorithm can be overwritten if one of the following

conditions is triggered:

•

Input overcurrent protection (OVC): inductor peak current

≤ 1.65 A

•

Overtemperature protection (OVT): internal temperature

≤ 155 °C

•

Output voltage regulation: V

CTRL

pin triggers the 1.25 V internal reference

•

Output current limitation: Rs * (I

CTRL

_

PLUS

- I

CTRL

_

MINUS

)

≤ 50 mV

•

MPP-SET voltage V

MPP-SET

≤ 300 mV at the startup and V

MPP-SET

≤ 450 mV in running

mode.

Application components must be carefully selected to avoid any undesired trigger of the

above thresholds.

AM11735v1

I

MP

P

MAX

Voltage [V]

0

V

OC

V

MP

AM11736v1

Lx

START SIGNAL

ZERO CROSSING

+

ANALOG BLOCK

START SIGNAL

VREF

+

-

ZERO CROSSING

DETECTOR

V

MPP-REF

XSHUT

-

OVER CURRENT

OVER TEMPERATURE

REVERSE POLARITY

MPP-SET

+

-

MPP-SET

V

MPP-REF

MPP BLOCK

CLOCK

BURST MODE

DAC CODE

DIGITAL

CORE

PWM

GND

+

-

VREF

Iout Reg

Vin Reg

Vout Reg

-

I

CTRL_MINUS

I

CTRL_PLUS

V

CTRL

V

OUT