STEVAL-ISV006V1 STMicroelectronics, STEVAL-ISV006V1 Datasheet - Page 8

• Manufacturer Part Number: STEVAL-ISV006V1
• Description: IC LINEAR
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISV006V1

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11418

SPV1040 description
Figure 8.
8/24
MPP-SET
XSHUT
GND
Lx
Figure 7.
Figure 7
approximations in the search for the MPP. This method is called “Perturb and Observe”. The
diagram shows that a comparison is made between the digital value of the power Pn
generated by the solar cells and sampled at instant n, and the value acquired at the previous
sampling period Pn-1. This allows the MPPT algorithm to determine the sign of duty cycle
and to increment or decrement it by a predefined amount. In particular, the direction of
adjustment (increment or decrement of duty cycle) remains unchanged until condition
Pn≥Pn-1 occurs, that is, for as long as it registers an increase of the instantaneous power
extracted from the cells string. On the contrary, when it registers a decrease of the power
Pn<Pn-1, the sign of duty cycle adjustment is inverted.
In the meantime, SPV1040 sets its own duty cycle according to the MPPT algorithm, other
controls are simultaneously executed in order to guarantee complete application safety.
These controls are mainly implemented by integrated voltage comparators whose
thresholds are properly set.
SPV1040 internal block diagram
ANALOG BLOCK
MPP BLOCK
shows the logical sequence followed by the device which proceeds for successive
MPPT working principle
BURST MODE
START SIGNAL
START SIGNAL
DAC CODE
CLOCK
Vin_ref
Vbg
OVER TEMPERATURE
REVERSE POLARITY
DIGITAL
OVER CURRENT
CORE
Doc ID 18265 Rev 1
ZERO CROSSING
ZERO CROSSING
DETECTOR
PWM
Iout Reg
Vin Reg
Vout Reg
+
-
+
+
+
-
-
-
-
Vin_ref
MPP-SET
Vbg
g
ICTRL_PLUS
ICTRL_MINUS
VCTRL
VOUT
AN3319
AM06703v1