ST ISV006V2 User Manual
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 RON 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 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 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.
Data brief
STEVAL-ISV006V2
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.
October 2011 |
Doc ID 018650 Rev 3 |
1/4 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Schematic diagram |
STEVAL-ISV006V2 |
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1 Schematic diagram
Figure 1. STEVAL-ISV006V2 circuit schematic
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VBAT+ |
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COUT |
J1 |
Battery Charge |
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Lx |
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Control circuit |
PV+ |
Lx |
VOUT |
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RS |
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XSHUT |
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ICTRL_PLUS |
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R |
V |
LOAD+ |
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XSHUT |
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F1 |
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R1 |
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VR10 |
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R5 |
GND |
ICTRL_MINUS |
CF |
RF2 |
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J28 |
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R3 |
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MPPSET |
VCTRL |
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Super |
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CIN |
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DOUT |
Cap |
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VR2 |
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VR4 |
C4 |
C2 |
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R9 |
PV- |
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R |
V |
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LOAD- |
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11 |
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VBAT- |
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AM06706v1 |
2/4 |
Doc ID 018650 Rev 3 |
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