STEVAL-ISV004V2 Datasheet, PDF (1/4 Pages) STMicroelectronics – Built-in soft-start

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
■ Max input current: 8 A
t(s) ^{■ PWM mode DC-DC boost converter}
■ Duty cycle controlled by MPPT algorithm with
uc 0.2% accuracy
d _{■ Protection against overvoltage, overcurrent}
ro _{and overtemperature}
P _{■ Built-in soft-start}
te _{■ Up to 98% efficiency}
le _{■ Automatic transition to burst mode for}
so improved efficiency during low solar radiation
b _{■ SPI interface}
- ^{O ■ RoHS compliant}
t(s) ^Description
uc The STEVAL-ISV004V2 demonstration board is
d _{based on the SPV1020 monolithic DC-DC boost}
ro converter in a PSSO36 package designed to
P maximize the power generated by photovoltaic
te ^{panels, independent of temperature and amount}
of solar radiation.
ole Optimization of power conversion is obtained
s _{through embedded logic, which performs the}
b_{MPPT (max power point tracking) algorithm}
O_{based on monitoring of the voltage and current}
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 over-
temperature (160 ^oC).
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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