Fix circuit power problem

I have designed a circuit to keep the heating element at a constant temperature. The digital part of the circuit is being feed from a 5V LDO which is powered by two 18650 batteries in series and the heating element is directly connected to the output batteries. Also heating element wire(approximately 2ohm) is controlled with an N channel low side mosfet by the microcontroller.

When controller toggles the mosfet because of the voltage drop on the supply.

The highest supply voltage for the system is between 6V-8.4V and load uses 2A. The problem is becomes more significant when the supply voltage gets lower. I don't think that any inrush current situation occurs because voltage continues to stay below 5V at the output of LDO as long as the load is active. Also i tried with both batteries(which can supply 20A) and a lab bench power supply but same problem occurs.

Квалификация: Схемотехника, Электротехника, Электроника, Микроконтроллер, Разводка печатной платы

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( 0 отзыв(-а, -ов) ) Istanbul, Turkey

ID проекта: #21798014

16 фрилансеров(-а) в среднем готовы выполнить эту работу за $191


Hello. you should not use LDO. what is the voltage of VCC when driving mosfet? you need to separate the digital circuit from the mosfet drive , change ADC reference of ATtiny88. more.. Regards.

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Hello, as your problem description seems to be missing, I have to wager an educated guess: - your microcontroller is sometimes resetting - more often at lower battery voltages. Provided you do not intend to send me y Больше

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