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CAS-D20TB データシート(PDF) 2 Page - List of Unclassifed Manufacturers

部品番号 CAS-D20TB
部品情報  ENERGY HARVESTING ELECTRONICS
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メーカー  ETC2 [List of Unclassifed Manufacturers]
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ELECTRICAL CHARACTERISTICS
PRINCIPLE OF OPERATION
2
REVISION N0. 002
REVISION DATE: 01-23-2013
The LTC3588-1 Piezoelectric Energy Harvesting Power
Supply from Linear Technology is the primary
component on the EHE004. From Linear Technology’s
datasheet:
“The LTC3588-1 integrates a low-loss full-wave
bridge rectifier with a high efficiency buck
converter to form a complete energy harvesting
solution optimized for high output impedance
energy sources such as piezoelectric transducers.
An ultralow quiescent current undervoltage lockout
(UVLO) mode with a wide hysteresis window
allows charge to accumulate on an input capacitor
until the buck converter can efficiently transfer a
portion of the stored charge to the output. In
regulation, the LTC3588-1 enters a sleep state in
which both input and output quiescent currents are
minimal. The buck converter turns on and off as
needed to maintain regulation.
Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are
pin selectable with up to 100mA of continuous
output current; however, the output capacitor may
be sized to service a higher output current burst.
An input protective shunt set at 20V enables
greater energy storage for a given amount of input
capacitance.”
For more information on the LTC3588-1 please visit:
http://cds.linear.com/docs/Datasheet/35881fa.pdf
Referring to Figure 2b, The LTC3588-1 power supply IC
integrates an extremely low quiescent current voltage
comparator with a highly efficient buck regulator. The
buck regulator is activated when the rectified input
voltage, VCAP, rises above the pre-set undervoltage
lockout (UVLO) rising voltage threshold for the chosen
output voltage setting (Page 5 table ‘Specification’).
The regulator remains active until the input voltage has
been depleted to the UVLO falling threshold, at which
point the buck operation is disabled. Thus, for as long
as the load demand exceeds the input power (as in
typical sensor or battery charger applications), the
input voltage will hover between the UVLO rising and
falling thresholds. In cases where the input power
exceeds the load demand, the VCAP voltage will rise
beyond the UVLO rising threshold, storing the excess
power on the input capacitor. If the voltage at VCAP
exceeds approximately 20VDC, an internal voltage
clamp (5mA continuous rating) prevents damage to the
device.
EHE004


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