STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 20

• Manufacturer Part Number: STEVAL-ISV009V1
• Description: Power Management Modules & Development Tools DUAL STG DC/AC CNVRT DEMO BRD
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-ISV009V1

• Design Resources: STEVAL-ISV009V1 BOM STEVAL-ISV009V1 Schematic
• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Power - Output: -
• Voltage - Output: 36V
• Current - Output: -
• Voltage - Input: -
• Regulator Topology: Boost
• Frequency - Switching: -
• Board Type: Fully Populated
• Utilized Ic / Part: SPV1020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Normal/MPPT mode
20/52
Increasing or decreasing DC depends on the update done in previous step (Sign) and by the
trend of the input power.
In fact, MPPT algorithm compares the current input power (P
computed in the previous step (P
previous step, otherwise the update is swapped (from increasing to decreasing or vice-
versa).
When system is at the MPPT, user can see the duty cycle oscillating between 3 values
within a time window of 256*3=768 times the switching period (7.68 ms).
Following figure shows the sampling/working points (by red circles) set by the SPV1020 and
how they change (by red arrows) during the normal operating mode.
Figure 18. MPPT data flow diagram
Input for the MPPT algorithm is the incoming power but its computation depends on the
working mode of the application: DCM or CM.
SPV1020 discriminates between DCM and CM by the zero crossing blocks (ZCB, refer to
zero crossing section for details).
SPV1020 moves between DCM and CM states implementing a sort of hysteresis,
depending on how many of the 4 ZCB have its own output activated. Following figure shows
the related FSM implemented within the Normal/MPPT mode:
Doc ID XXXXX Rev 1
tn-1
). If power is growing then the update is same of the
tn
) with the input power
AN3392