Hi,
I have a 2.7 500F super capacitor model # mh47765. I have been performing low power experiments with it as to learn it's nature. Immediately prior to charging with a buck boost converter (specs below), I had the supercap placed in a crude boost converter circuit of my own design that had reduced the voltage to 800mV.
I (previously) set the DSN6000AUD to 2.6V and began to charge the supercap from 800mV monitoring the entire time as I've done before. After ten minutes I returned to find the supercap voltage was at 3.3V! What the heck happened here? For safety I connected a motor and reduced the voltage to 2.7V (which took nowhere near the calculated runtime) and have been monitoring the self-discharge. In about 12 hours the voltage has self discharged from 2.7V to 2.0V and seems to be holding at 2V. I do not intend to use the supercap until I get to the bottom of this as my search results were unsuccessful.
Model Specification:DSN6000AUD Automatic Buck module
Module Properties: Non-isolated boost (BOOST)
Rectification: Non-Synchronous Rectification
Input Range:3.8V ~ 32V
Output Range:1.25V ~ 35V
Input Current:3A ( max ) , no-load 18mA (5V input , 8V output , no-load is less than 18mA. Higher the voltage , the greater the load current . )
Conversion efficiency:< 94% ( greater the current , the lower the efficiency )
Switching frequency:400KHz
Output Ripple:50mV ( the higher the voltage , the greater the current , the greater the ripple )
Load Regulation:± 0.5%
Voltage Regulation:± 0.5%
Operating Temperature:-40 ℃ ~ +85 ℃
Dimensions:48mm * 25mm * 14mm ( L * W * H )
I have a 2.7 500F super capacitor model # mh47765. I have been performing low power experiments with it as to learn it's nature. Immediately prior to charging with a buck boost converter (specs below), I had the supercap placed in a crude boost converter circuit of my own design that had reduced the voltage to 800mV.
I (previously) set the DSN6000AUD to 2.6V and began to charge the supercap from 800mV monitoring the entire time as I've done before. After ten minutes I returned to find the supercap voltage was at 3.3V! What the heck happened here? For safety I connected a motor and reduced the voltage to 2.7V (which took nowhere near the calculated runtime) and have been monitoring the self-discharge. In about 12 hours the voltage has self discharged from 2.7V to 2.0V and seems to be holding at 2V. I do not intend to use the supercap until I get to the bottom of this as my search results were unsuccessful.
Model Specification:DSN6000AUD Automatic Buck module
Module Properties: Non-isolated boost (BOOST)
Rectification: Non-Synchronous Rectification
Input Range:3.8V ~ 32V
Output Range:1.25V ~ 35V
Input Current:3A ( max ) , no-load 18mA (5V input , 8V output , no-load is less than 18mA. Higher the voltage , the greater the load current . )
Conversion efficiency:< 94% ( greater the current , the lower the efficiency )
Switching frequency:400KHz
Output Ripple:50mV ( the higher the voltage , the greater the current , the greater the ripple )
Load Regulation:± 0.5%
Voltage Regulation:± 0.5%
Operating Temperature:-40 ℃ ~ +85 ℃
Dimensions:48mm * 25mm * 14mm ( L * W * H )
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