data brief for further information contact your local stmicroelectronics sales office. october 2011 doc id 018650 rev 3 1/4 4 STEVAL-ISV006V2 up to 5 w solar battery charger with embedded mppt based on the spv1040 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 r on resistance overcurrent and overtemperature protection input reverse polarity protection led charge status indicator rohs compliant 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 capab ility is extremely important. thanks to the embedded mppt algorithm, even under varying environmental conditions (such as irradiation, dirt, temper ature) the spv1040 offers maximum efficiency in terms of power harvested from the cells and transferred to the output. 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. the STEVAL-ISV006V2 demonstration board is supplied by a pv panel with p pk of 200 mw, which can be replaced with pv panels with p pk up to 5 w (v oc < 5 v) depending on application requirements. the output load is a 220 mf, 5.5 v super- capacitor that can be replaced with lead-acid, nicd or nimh rechargeable batteries (max voltage = 5 and > v oc 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. STEVAL-ISV006V2 www.st.com
schematic diagram STEVAL-ISV006V2 2/4 doc id 018650 rev 3 1 schematic diagram figure 1. STEVAL-ISV006V2 circuit schematic am06706v1 v bat+ option a l lx r s pv+ lx x j 1 b a ttery ch a rge control circ u it c out x s hut gnd mpp s et r 1 r 3 r f1 r f2 c f x s hut r 5 v load+ j2 8 su per vr 10 mpp - s et vr 2 vr 4 c 4 c 2 c in d out pv- r 11 v c a p r 9 11 v v v ctrl_minu s i ctrl_plu s i out ctrl load- bat-
STEVAL-ISV006V2 revision history doc id 018650 rev 3 3/4 2 revision history table 1. document revision history date revision changes 25-mar-2011 1 initial release. 05-may-2011 2 updated: figure 1: steval-isv006 v2 circuit schematic . 11-oct-2011 3 updated: figure of the board in cover page
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