Task: Make a reliable power supply for sensors and an RFID card reader.
- Total current consumption: up to 0.7A (700 mA.)
- Elements supply voltage: 3.3V
- Input voltage: 5V
- Working temperature: from -30 to + 40
For these purposes, I found the AMS1117 voltage regulator.
The technical description indicates the use of tantalum capacitors.
I studied them, and I still had doubts about their reliability.
What I learned:
- Tantalum minimally changes the capacitance with a change in voltage and temperature, unlike ceramic capacitors.
- Tantalum does not age
- Makes no sound
- May explode in case of strong impulse or incorrect polarity.
- It has a high parasitic inductance, unlike ceramics.
Many boards with this voltage regulator use ceramic capacitors, but I'm not sure about the reliability of this option.
I worry that tantalum may explode or fail.
- Is it dangerous to use tantalum and is it worth switching to ceramics?
- Is it good to use electrolytic capacitors, given the negative operating temperatures?
- I heard that special voltage regulators have appeared, designed to work with ceramic capacitors. What are some good options? The current must be up to 1A.
My main task is to provide reliable power to the sensors and reader.