11/29/2023 0 Comments Class d amp![]() Where V O is the amplifier output voltage (speaker voltage) and I O is the output current.Ĭalculating the Power Supply Output Voltage and Current Requirements P SE(RMS) for amplifiers with single-end outputs.P SE(PEAK) = I O 2 R L = ( V O /2 R T ) 2 R L = ¼( V O / R T ) 2 R L = 2 P BTL(RMS) for amplifiers with BTL outputs.P BTL(PEAK) = I O 2 R L = ( V O / R T ) 2 R L = 2 The peak power that an amplifier can deliver to the load is The peak output power occurs at the peak of the voltage or current into the speaker. Duty cycle is also referred to as the modulation index ( M ), and M MAX is the maximum modulation factor.īecause amplifiers with BTL outputs can provide twice the peak-to-peak voltage to the load as a single-ended amplifier, the maximum output power of a single-ended amplifier is only ¼ of the maximum output power of a BTL amplifier with the same power supply voltages and load impedance. M MAX is the amplifier's maximum output duty cycle. This is particularly important for components that may have significant power dissipation such as the amplifier IC and the filter inductors. Note that most of these resistances have temperature coefficients so it is important to use the component's resistance at its maximum operating temperature. Where R LOAD is the load (speaker) resistance, R OUT is the on-resistance ( R DSon ) of the amplifier's output transistors (one transistor for single-ended outputs and two transistors for BTL outputs), R IND is the DC resistance of the output filter inductors, R PCB the resistance of the circuit board traces, connectors, and wires, and R PS is the power supply output impedance. R T = R LOAD + R OUT + R IND + R PCB + R PS Where R T is the sum of all of the DC resistances in series with the load: The maximum RMS power that an amplifier can deliver to the load without clipping is: The amplifier should be able to provide its rated power at the minimum power supply output voltage, taking all of the above factors into account. The nominal power supply output voltage is also a function of the power supply's output voltage tolerance and its line and load regulation. the amplifier's maximum achievable duty cycle. ![]() the amplifier output configuration (single-ended or BTL).the amplifier's output power requirements.The voltage required for an amplifier depends on several factors, including: The power supply voltage is one of the primary factors in determining how much power an amplifier can deliver to the load.
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