SPV1020 Interleaved DC-DC boost converter with built-in MPPT algorithm Datasheet production data 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 PowerSSO-36 Interleaved 4-phase topology Built-in soft-start For a cost effective application solution and to Up to 98% efficiency minimize size, the SPV1020 embeds power Power capability 320 W at 40 V output MOSFETs for active switches and synchronous Automatic transition to burst mode for rectifiers, minimizing the number of external improved efficiency at low solar radiation devices. In addition, the 4-phase interleaved topology of the DC-DC converter obviates the SPI interface need to use electrolytic capacitors, which may severely limit system lifetime. Applications The SPV1020 operates at fixed frequency in Photovoltaic panels PWM mode, where the duty cycle is controlled by Battery charging with a CVCC controller the embedded logic running a Perturb&Observe MPPT algorithm. The switching frequency, internally generated and set by default at 100 Description kHz, is externally adjustable from 50 kHz to 200 kHz, while the duty cycle can range from 5% to The SPV1020 is a monolithic 4-phase interleaved 90% with a step of 0.2%. DC-DC boost converter designed to maximize the power generated by photovoltaic panels The safety of the application is guaranteed by independent of temperature and amount of solar stopping the drivers in the case of output radiation. overvoltage or overtemperature. Optimization of the power conversion is obtained Multiple SPV1020s can be used in a panel array with embedded logic which performs the MPPT with one SPV1020 per panel. Panels can be (max. power point tracking) algorithm on the PV connected in series, in parallel, or series/parallel cells connected to the converter. combinations. One or more converters can be housed in the Table 1. Device summary connection box of the PV panels, replacing the bypass diodes. As the maximum power point is Order codes Package Packaging locally computed, the efficiency at system level is higher than that of conventional topologies, where SPV1020 PowerSSO-36 Tube the MPP is computed in the main centralized inverter. May 2012 Doc ID 17588 Rev 4 1/20 This is information on a product in full production. www.st.com 20Contents SPV1020 Contents 1 Application circuit . 3 2 Pin connection 4 3 Maximum ratings 6 3.1 Absolute maximum ratings . 6 4 Electrical characteristics . 7 5 Detailed description . 8 5.1 Initialization and startup mode 8 5.2 Oscillator 9 5.3 Input voltage sensing . 9 5.4 Output voltage sensing and overvoltage protection (OVP) 10 5.5 Overcurrent protection (OCP) . 11 5.6 Overtemperature protection (OTP) 11 5.7 Shutdown . 11 5.8 Undervoltage lockout (UVLO) . 11 5.9 MPPT 11 5.10 SPI 11 5.11 SPI timing diagram 13 6 Typical curves . 15 7 Package mechanical data 17 8 Revision history . 19 2/20 Doc ID 17588 Rev 4