Determine the Given Terms for a Class B Amplifier
A class B amplifier with Vcc = 25V driving an 80 load, determine the following terms? i) Maximum I/P power. ii) Maximum O/P power. iii) Maximum circuit efficiency.
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Vcc = 25 V Load voltage = VL
RL = 80 Ohms
Load current = Ip = VL / RL
Input current (dc) Idc = 2/π * Ip = 2/π * VL / RL
Input power = Vcc * Idc = (2/π) Vcc * VL / RL
Output power = 1/2 * VL^2 /RL
Maximum output power (AC) when VL = Vcc
Po => (1/2) * 25^2 / 80 = 625/160 W : AC power
Maximum input power : (DC power)
Pi = (2/π) * Vcc^2/RL = (2/π) *25^2 /80 W
Maximum circuit efficiency = Po/ Pi * 100 = 100 * π/4 = 78.54 %
RL = 80 Ohms
Load current = Ip = VL / RL
Input current (dc) Idc = 2/π * Ip = 2/π * VL / RL
Input power = Vcc * Idc = (2/π) Vcc * VL / RL
Output power = 1/2 * VL^2 /RL
Maximum output power (AC) when VL = Vcc
Po => (1/2) * 25^2 / 80 = 625/160 W : AC power
Maximum input power : (DC power)
Pi = (2/π) * Vcc^2/RL = (2/π) *25^2 /80 W
Maximum circuit efficiency = Po/ Pi * 100 = 100 * π/4 = 78.54 %
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