MB39C811 Datasheet, PDF (15/36 Pages) Cypress Semiconductor – Ultra Low Power Buck PMIC Solar/Vibrations Energy Harvesting

MB39C811
9. Application Notes
Inductor
The MB39C811 is optimized to work with an inductor in the range of 10µH to 22µH. Also, since the peak switching
current is up to 400mA, select an inductor with a DC current rating greater than 400mA.
Table 11. Manufactures of Recommended Inductors
Part number
LPS5030-223ML
Value
22μH
VLF403215MT-220M
22μH
Manufacture
Coilcraft, Inc.
TDK Corporation
Harvester (Photovoltaic Power Generator)
In case of photovoltaic energy harvesting, such as solar or light energy harvesting, use a solar cell with high
open-circuit voltage which must be higher than the UVLO release voltage. Electric power obtained from light or solar
is increased in proportion to the ambient illuminance.
There are silicone-based solar cells and organic-based solar cells about photovoltaic power
generators.Silicone-based solar cells are single crystal silicon solar cell, polycrystalline silicon solar cell, and
amorphous silicon solar cell. Organic-based solar cells are dye-sensitized solar cell (DSC), and organic thin film solar
cell. Crystal silicon and polycrystalline silicon solar cells have high energy conversion efficiency. Amorphous silicon
solar cells are lightweight, flexible, and produced at low cost. Dye-sensitized solar cells are composed by sensitizing
dye and electrolytes, and are low-cost solar cell. Organic thin film solar cells are lightweight, flexible, and easily
manufactured.
Table 12. Manufactures Of Photovoltaic Harvesters
Part number/Series name
BCS4630B9
Type
Film amorphous silicon solar cells
Amorton
Amorphous silicon solar cells
Manufacture
TDK Corporation
Panasonic Corporation
Harvester (Vibration Power Generator,Piezoelectric Generator)
Vibration power generators produce AC power by vibration. For AC to DC rectification, the MB39C811 integrates two
bridge rectifiers. Electric power obtained from a vibration power generator depends on frequency of vibration and
usage of the generator. Although, vibration generators produce high voltage, the shunt circuit protects from higher
voltage than 21V.
There are electromagnetic induction generators and piezoelectric generators about vibration harvesters. The
electromagnetic induction generator is consists of coil and magnet. The piezoelectric generators are made from
plastics or ceramics. Plastic-based piezoelectric generators made from polyvinylidene fluoride are lightweight, flexible.
Ceramic-based piezoelectric generators are made from barium titanate or leas zirconate titanate ceramics.
Table 13. Manufactures of Vibration Harvesters
Part number
Type
EH12, EH13, EH15
Electromagnetic induction
Manufacture
Star Micronics Co., Ltd.
Document Number: 002-08401 Rev *A
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