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CAS-D20TB データシート(PDF) 2 Page - List of Unclassifed Manufacturers |
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CAS-D20TB データシート(HTML) 2 Page - List of Unclassifed Manufacturers |
2 / 8 page 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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