Switching Power Supply Calculator

Frequently Asked Questions (FAQ)

Q1: What is the primary difference between Buck and Boost converters?
A Buck converter steps down voltage, while a Boost converter steps up voltage.

Q2: Why is switching frequency important?
Higher frequencies allow for smaller inductors and capacitors but typically result in higher switching losses.

Q3: How do I choose the inductor ripple current percentage?
30% is a standard industry rule-of-thumb, balancing inductor size and output current ripple performance.

Q4: Why does capacitor ESR matter?
High ESR causes voltage ripples and increases heat dissipation in output capacitors, potentially leading to failure.

Q5: What is duty cycle?
Duty cycle is the percentage of time the switch is closed, determining the voltage conversion ratio.

Q6: How does efficiency affect my design?
Higher efficiency reduces heat generation, smaller heatsink requirements, and improved battery life for portable devices.

Q7: Can I use this for high-power applications?
Yes, but ensure you also consider PCB layout parasitics and thermal management beyond these theoretical values.