STEVAL-ISV005V1 STMicroelectronics, STEVAL-ISV005V1 Datasheet - Page 8

• Manufacturer Part Number: STEVAL-ISV005V1
• Description: BOARD DEMONSTRATION FOR SPV1020
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-ISV005V1

• Main Purpose: Power Management, Battery Charger Solar Powered
• Embedded: No
• Utilized Ic / Part: SPV1020, SEA05
• Primary Attributes: Built in MPPT (Max Power Point Tracking) and Soft Start
• Secondary Attributes: I/O Overcurrent Control, Output Overvoltage Control
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11764

Detailed description
5
5.1
8/18
Detailed description
SPV1020 is a fully integrated high efficiency DC/DC boost converter with 4 phase
interleaved topology operating in the voltage range from 6.5 V to 45 V. The simplified block
diagram, showing only one of the four phases, is reported below.
Figure 3.
Initialization and start-up mode
In order to guarantee a correct power-up, avoiding voltage oscillation, the converter starts
to work in burst mode activating sequentially the four phases when the input voltage is
higher than 6.5 V, set by the internal UVLO. For this reason a soft start strategy has been
implemented.
At the beginning, only the phase 1 starts to work in burst mode, charging the inductor only
for one cycle over 15 cycles. Then, the duty cycle is progressively reduced until the phase 1
is switched regularly ON at every cycle and at the default switching frequency of 100 kHz.
After, the phase 1 has reached the steady state condition, all the other phases are
progressively switched ON with the following sequence: phase 3, phase 2 and, at end,
phase 4.
Of course, all the sequence is running if the power generated by the PV cells string is always
increasing, otherwise, the sequence can go back and then ahead again.
PV cell
string
Simplified block diagram
SPI DATA IN
VIN_SNS_M
SPI_CLK
VIN_SNS
OSC IN
XCS
VIN
PGND
LX
Osc
Doc ID 17588 Rev 2
200 mV
1.05V
+
-
+
-
conv ert er
conv ert er
convert er
A/D
A/D
A/D
MPPT
Fault
Ctrl
Ctrl
1.0V
+
-
CB
VB
VOUT_SN
PGND
PZ_OUT
VIN
VOUT
SGND
SPI_DATA_OUT
DIAG
VREG
SPV1020