EVIX-CX3AA IXYS-DIRECTED ENERGY, EVIX-CX3AA Datasheet - Page 5

• Manufacturer Part Number: EVIX-CX3AA
• Description: Solar Charger Evaluation Board
• Manufacturer: IXYS-DIRECTED ENERGY

Specifications of EVIX-CX3AA

• Silicon Manufacturer: IXYS Solar
• Silicon Core Number: XOB17-12x1
• Kit Application Type: Power Management - Battery
• Application Sub Type: Battery Charger

Component Description
IXYS XOB17-12x1 Solar Cell
The battery charging current is generated by three series-connected IXYS XOB17-12x1
SolarBIT
circuit voltage and 42 mA short circuit current (0.51 V and 39 mA at the Maximum Power
Point at 1 Sun irradiance). Their small size and very high power conversion efficiency
makes these cells ideal for portable devices with limited space to accommodate solar cells,
such as
sensors. These applications are very different from those involving arrays of polycrystalline
panels and their associated higher power levels.
IXYS IXTY12N06T Power MOSFET
The purpose of the power MOSFET in circuit is to serve as a blocking mechanism. It
prevents the battery from discharging back through the solar cells when the output voltage
from the solar cells is lower than the battery, such as during low light conditions and night
time hours. While the blocking duty could be performed by a rectifier diode, the MOSFET
imposes no diode forward voltage drop penalty and eliminates the need for additional,
more costly, solar cells to overcome the voltage drop.
Clare CPC1832N Solar Cell
The Clare CPC1832N solar cell serves to provide gate voltage to the blocking MOSFET, turning
the MOSFET on when the cells are exposed to sunlight and off at darkness. The CPC1832N’s
wavelength sensitivity lies within the upper spectral range (infrared) so the cell needs to be
exposed to direct sunlight for charging to occur. It’s current output is only in the microampere
(uA) range, but its 8V output is sufficient to overcome the gate threshold level of the blocking
MOSFET and the additional 1.5V present in the MOSFET source to ground path.
IXYS Solar AA Battery
The 1.5V AA battery provided with the evaluation board is a rechargeable alkaline of Zinc-
Manganese Dioxide (Zn/MnO
energy density, lower internal resistance, and better low temperature performance. The capacity
of the battery for use in general applications is listed in Figure 4.
s.
cell phones, PDAs, MP3 players, GPS systems, and remote low power systems and
Each of these monocrystalline, high-efficiency solar cells generates 0.63 V open
Application
Cassette
Motor/Toy
Radio
Pulse test 1.8 ohms 15 sec/min to 0.9V
Photo flash
Figure 4. Battery Capacity Table
2
) construction. Compared to a carbon zinc battery, it has higher
10 ohms 1 hr/day to 0.9V
3.9 ohms 1 hr/day to 0.8V
43 ohms 4 hr/day to 0.9V
1000 mA continuous to 1V
Condition
-5-
SOLAR
SOLAR
600 pulses
Minimum Average
18.0 hrs
6.8 hrs
85 hrs
27 mins