Calculadora de Eficiência do Regulador Chaveado
Calcule a eficiência de reguladores de tensão chaveados e compare com reguladores lineares.
Input Power
7.33 W
Input Power vs Input Voltage
Formula
## Switching Regulator Efficiency ### Formulas **P_in = P_out / Efficiency** **I_in = P_out / (Efficiency x V_in)** Switching regulators convert voltage using rapid switching and an inductor. They achieve 85-95% efficiency regardless of voltage ratio, far better than linear regulators for large step-downs.
Exemplo Resolvido
12 V to 3.3 V at 2 A with 90% efficiency.
- 01P_out = 3.3 x 2 = 6.6 W
- 02P_in = 6.6 / 0.9 = 7.33 W
- 03I_in = 7.33 / 12 = 0.611 A
- 04Power lost = 7.33 - 6.6 = 0.73 W
Perguntas Frequentes
Buck vs boost vs buck-boost?
Buck steps voltage down, boost steps up, buck-boost can do either. Choose based on your input vs output voltage relationship.
What affects efficiency?
Switching frequency, inductor DCR, MOSFET Rds(on), diode losses, and controller quiescent current all reduce efficiency.
Why not always use switching regulators?
They generate switching noise (EMI). Linear regulators are preferred for noise-sensitive circuits like ADCs and audio.
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