The PWM amplifier output power calculator is used to determine the effective root mean square (rms) power for a given speaker load. The spreadsheet is configured to calculate the actual power delivered to the speaker load for three typical speaker-load configurations, half-bridge tied, full-bridge tied and parallel full-bridge tied. For more details, please view the Application Note.
Voltage Rail Vp (volts) |
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PWM Output Rds_on (ohms) |
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Capacitor ESR (ohms) |
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Inductor Resistance (ohms) |
Speaker Load (ohms) |
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Power Out (Wrms) |
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Total Current (lrms) |
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Total Current (lpeak) |
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Power at the Load (Wrms) |
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0.1% THD+N |
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1% THD+N(x1.15) |
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10% THD+N(x1.75) |
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| Efficiency |
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Power Dissipation (Wrms) per channel |
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Speaker Load (ohms) |
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Power Out (Wrms) |
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Total Current (lrms) |
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Total Current (lpeak) |
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Power at the Load (Wrms) |
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0.1% THD+N |
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1% THD+N(x1.15) |
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10% THD+N(x1.75) |
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| Efficiency |
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Power Dissipation (Wrms) per channel |
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Speaker Load (ohms) |
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Power Out (Wrms) |
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Total Current (lrms) |
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Total Current (lpeak) |
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Power at the Load (Wrms) |
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0.1% THD+N |
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1% THD+N(x1.15) |
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10% THD+N(x1.75) |
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| Efficiency |
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Power Dissipation (Wrms) per channel |
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x