SPV1020 Datasheet, PDF (1/19 Pages) STMicroelectronics – Interleaved DC-DC boost converter with built-in MPPT algorithm

SPV1020
Interleaved DC-DC boost converter with built-in MPPT algorithm
Features
■ PWM mode DC-DC boost converter
■ Duty cycle controlled by MPPT algorithm with
0.2% accuracy
■ Operating voltage range 6.5 - 40 V
■ Overvoltage, overcurrent, overtemperature
protection
■ Interleaved 4-phase topology
■ Built-in soft-start
■ Up to 98% efficiency
■ Power capability 320 W at 40 V output
■ Automatic transition to burst mode for
improved efficiency at low solar radiation
■ SPI interface
Applications
■ Photovoltaic panels
■ Battery charging with a CVCC controller
Description
The SPV1020 is a monolithic 4-phase interleaved
DC-DC boost converter designed to maximize the
power generated by photovoltaic panels
independent of temperature and amount of solar
radiation.
Optimization of the power conversion is obtained
with embedded logic which performs the MPPT
(max. power point tracking) algorithm on the PV
cells connected to the converter.
One or more converters can be housed in the
connection box of the PV panels, replacing the
bypass diodes. As the maximum power point is
locally computed, the efficiency at system level is
higher than that of conventional topologies, where
the MPP is computed in the main centralized
inverter.
PowerSSO-36
For a cost effective application solution and to
minimize size, the SPV1020 embeds Power
MOSFETs for active switches and synchronous
rectifiers, minimizing the number of external
devices. In addition, the 4-phase interleaved
topology of the DC-DC converter obviates the
need to use electrolytic capacitors, which may
severely limit system lifetime.
The SPV1020 operates at fixed frequency in
PWM mode, where the duty cycle is controlled by
the embedded logic running a Perturb&Observe
MPPT algorithm. The switching frequency,
internally generated and set by default at 100
kHz, is externally adjustable from 50 kHz to 200
kHz, while the duty cycle can range from 5% to
90% with a step of 0.2%.
The safety of the application is guaranteed by
stopping the drivers in the case of output
overvoltage or overtemperature.
Multiple SPV1020s can be used in a panel array
with one SPV1020 per panel. Panels can be
connected in series, in parallel, or series/parallel
combinations.
Table 1. Device summary
Order codes
Package
SPV1020
PowerSSO-36
Packaging
Tube
January 2012
Doc ID 17588 Rev 3
1/19
www.st.com
19