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capacitor power supply voltage drop

Question asked by kandasamy.parthiaban on Mar 9, 2017

Hi, i designed transformerless capacitive power supply for compact home automation project. Initially its used for only controlling load so it worked good at 4.8Vdc. Later i added seven segment display and tactile switch for HMI, once all circuit construction done at breadboard then i checked voltage it drops from 4.8V to 4.1V. This is due to current demand while adding more component i understand that. But i seen some reference from ST, MICROCHIP, NXP they were used this power supply in energy meter design and this circuit will have adc, display, keypad, communication circuit. Is there any special consideration has to be follow to get correct voltage regulation?.

 

Application Note : AN1476 from STM

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