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 R
ON
resistance
Overcurrent and overtemperature protection
Input reverse polarity protection
LED charge status indicator
RoHS compliant
STEVAL-ISV006V2
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.
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.
October 2011
Doc ID 018650 Rev 3
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4
For further information contact your local STMicroelectronics sales office.
Schematic diagram
STEVAL-ISV006V2
1
Figure 1.
Schematic diagram
STEVAL-ISV006V2 circuit schematic
optional
C
OUT
PV+
Lx
X
SHUT
R5
Lx
XSHUT
GND
V
OUT
I
CTRL_PLUS
I
CTRL_MINUS
V
CTRL
VR
2
VR
4
PV-
C
4
C
2
R
11
V
LOAD-
R
9
C
F
R
F1
R
1
R
3
C
IN
R
F2
R
S
V
LOAD+
VR
10
J28
Super
Cap
J
1
V
BAT+
Battery Charge
Control circuit
MPP-
MPP
SET
D
OUT
V
BAT-
AM06706v1
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Doc ID 018650 Rev 3
STEVAL-ISV006V2
Revision history
2
Revision history
Table 1.
Date
25-Mar-2011
05-May-2011
11-Oct-2011
Document revision history
Revision
1
2
3
Initial release.
Updated:
Figure 1: STEVAL-ISV006V2 circuit schematic.
Updated: figure of the board in cover page
Changes
Doc ID 018650 Rev 3
3/4
STEVAL-ISV006V2
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