STEVAL-ISV006V2 Up to 5 W solar battery charger with embedded MPPT based on the SPV1040 Data brief Features ■ High-efficiency monolithic step-up DC-DC converter ■ Proprietary “perturb & observe” embedded MPPT algorithm ■ Very low input voltage (down to 0.3 V) ■ Integrated N-channel and P-channel MOSFETs with low RON resistance ■ Overcurrent and overtemperature protection ■ Input reverse polarity protection ■ LED charge status indicator ■ RoHS compliant STEVAL-ISV006V2 Description The STEVAL-ISV006V2 demonstration board is based on the SPV1040 high efficiency solar battery charger with embedded MPPT. The SPV1040 device is a low power, low voltage, monolithic step-up converter with an input voltage range from 0.3 V to 5.5 V, and is capable of maximizing the energy generated by even a single solar cell (or fuel cell), where low input voltage handling capability is extremely important. Thanks to the embedded MPPT algorithm, even under varying environmental conditions (such as irradiation, dirt, temperature) the SPV1040 offers maximum efficiency in terms of power harvested from the cells and transferred to the output. The STEVAL-ISV006V2 demonstration board is supplied by a PV panel with PPK of 200 mW, which can be replaced with PV panels with PPK up to 5 W (VOC < 5 V) depending on application requirements. The output load is a 220 mF, 5.5 V supercapacitor that can be replaced with lead-acid, NiCd or NiMh rechargeable batteries (max voltage = 5 and > VOC of the selected PV panel). The demonstration board provides a simple charge status indicator using 2 LEDs, and 3 trimmers are available to allow setup according to the specific application requirements. The device employs an input voltage regulation loop, which fixes the charging battery voltage via a resistor divider. The maximum output current is set with a current sense resistor according to charging current requirements. The SPV1040 protects itself and other application devices by stopping the PWM switching if either the maximum current threshold (up to 2 A) is reached or the maximum temperature limit (up to 155 °C) is exceeded. October 2011 Doc ID 018650 Rev 3 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic diagram STEVAL-ISV006V2 1 Schematic diagram Figure 1. STEVAL-ISV006V2 circuit schematic optional VBAT+ J1 COUT Lx PV+ XSHUT Lx XSHUT VOUT RF1 I CTRL_PLUS VLOAD+ R1 R3 R5 GND MPP SET MPP- CIN Battery Charge Control circuit RS ICTRL_MINUS CF VR10 RF2 VCTRL J28 Super Cap D OUT VR2 VR4 C4 C2 R9 R11 PV- VLOAD- VBATAM06706v1 2/4 Doc ID 018650 Rev 3 STEVAL-ISV006V2 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 25-Mar-2011 1 Initial release. 05-May-2011 2 Updated: Figure 1: STEVAL-ISV006V2 circuit schematic. 11-Oct-2011 3 Updated: figure of the board in cover page Doc ID 018650 Rev 3 3/4 STEVAL-ISV006V2 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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