STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 17

• 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

AN3392
8
Burst mode
This mode guarantees a correct start-up for SPV1020, avoiding voltage oscillation. After the
power supply connection, the converter starts to work when input voltage becomes higher
than 6.5 V (ULVO_H).
Burst Mode contains 4 internal states, which guarantees to activate gradually phase “1” and
sequentially the four phases. Following diagram shows the FSM of the burst mode (grey
circles are the states of the burst mode).
Each phase is driven with set of 10 “pulses”. Each pulse can be “ON”, driving the phase with
a signal at minimum PWM (DC = 5%), or “OFF”, driving signal completely low.
When activated, a phase is driven with 1 pulse “ON” and 9 “OFF”. Number of “ON” pulses
can be increased up to 10 (in this case, another phase is activated), or decreased up to 0
(the phase is always off).
Increasing or decreasing “ON” pulses depends on the status of the ULVO signal that checks
if input voltage is greater the minimum threshold or not.
Figure 13. Burst mode, FSM
When all the 4 phases are active the system enters the Normal (or MPPT) mode.
Doc ID XXXXX Rev 1
Burst mode
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