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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.
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www.st.com
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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
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Doc ID 018650 Rev 3
STEVAL-ISV006V2
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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
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STEVAL-ISV006V2
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