I am using this DC-DC buck converter - buck converter.
Buck Converter Specifications :
- Input Voltage - 18V to 32V
- Switching Frequency - 300kHz
- Output Voltage 9V
- Load Current - 0mA to 200mA Maximum.
I have 2 questions:
- What does it mean when a design recommendation states - "The output capacitor ESR and capacitance form a zero = 1 / (2 x π x Cout x ESR). This zero can move significantly if an aluminum output capacitor is used. Aluminum output caps ESR can change 10x over temperature."
Can someone explain me a little intuitive on what this recommendation states and why should I take care when designing a buck converter? How to test it or verify this recommendation?
- Why should we care about the output aluminium electrolytic capacitor's frequency vs impedance graph while selecting the output capacitor of the buck converter (in this case the 47uF?)
Can someone explain to me a little intuitively the answers for the above 2 questions?