STEVAL-ISV004V2
240 W PV converter for photovoltaic panels
based on the SPV1020
Data brief
Features
■
Operating input voltage: 6.5 V to 45 V
■
Max output voltage: 40 V
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Max input current: 8 A
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PWM mode DC-DC boost converter
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Duty cycle controlled by MPPT algorithm with
0.2% accuracy
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Protection against overvoltage, overcurrent
and overtemperature
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Built-in soft-start
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Up to 98% efficiency
■
Automatic transition to burst mode for
improved efficiency during low solar radiation
■
SPI interface
■
RoHS compliant
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Description
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The STEVAL-ISV004V2 demonstration board is
based on the SPV1020 monolithic DC-DC boost
converter in a PSSO36 package designed to
maximize the power generated by photovoltaic
panels, independent of temperature and amount
of solar radiation.
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STEVAL-ISV004V2
PWM switching (duty cycle varies between 5%
and 90%, with 0.2% accuracy) is regulated by
default at 100 kHz by an internal oscillator, but is
programmable between 50 kHz and 200 kHz via
an external resistor.
Application safety is ensured by stopping the
PWM switching in case of output overvoltage (set
by external trimming), overcurrent (internally
regulated at 4 A for each channel) and overtemperature (160 oC).
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Optimization of power conversion is obtained
through embedded logic, which performs the
MPPT (max power point tracking) algorithm
based on monitoring of the voltage and current
supplied by the PV cells.
The precision of the algorithm is guaranteed by a
10-bit ADC for current and voltage sensing.
For cost-effectiveness and miniaturization of the
application, the SPV1020 embeds 8 power
MOSFETs for active switching and synchronous
rectification, minimizing the number of external
components required. The 4-phase interleaved
topology of the DC-DC converter means that
electrolytic capacitors can be avoided, which
would otherwise severely limit system lifetime.
May 2011
Doc ID 17824 Rev 3
For further information contact your local STMicroelectronics sales office.
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Connection diagram
STEVAL-ISV004V2
1
Connection diagram
Figure 1.
SPV1020 connections (for PSSO36 package)
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Doc ID 17824 Rev 3
STEVAL-ISV004V2
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Revision history
Revision history
Table 1.
Document revision history
Date
Revision
Changes
12-Aug-2010
1
Initial release.
17-Nov-2010
2
Updated title on cover page.
20-May2011
3
Updated Figure 1: SPV1020 connections (for PSSO36 package).
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Doc ID 17824 Rev 3
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STEVAL-ISV004V2
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