# Homework Solution: a class-AB power amplifier is to be designed for a 6.0W, 12Omega load. Darlington power transistors with beta _{F}=1250 and rated at 19W for T_{JMAX} =150 C, are av…

a class-AB power amplifier is to be designed for a 6.0W, 12 load. Darlington power transistors with =1250 and rated at 19W for  =150 C, are available. A diode biasing network with diodes of junction size 1/20 that of the power transistors is to be used to give class AB operation. a) What is the optimum  and <(max)>? b) if we require that the currect through the diodes vary by no more than a factor of 6, what  (current source) is necessary and what  results? c) Suppose that the only power supply available has Vs = ±15V. VL(Max) does not change, and neither does the Ibias requirement. But VL(worst), PD(worst, classB) , and PDQ do. What are their values? D) What is  (worst,total)? e) What size heat sinks  are needed for each transistor if we require a safety margin  = 25 C

a collocate-AB effectiveness amplifier is to be purposed control a 6.0W, 12 load. Darlington effectiveness transistors with =1250 and rated at 19W control  =150 C, are profitable. A diode prepossessioning network with diodes of joining greatness 1/20 that of the effectiveness transistors is to be used to bestow collocate AB influence.

a) What is the optimum  and <(max)>?

b) if we exact that the currect through the diodes deviate by no over than a ingredient of 6, what  (ordinary fountain) is essential and what  results?

c) Suppose that the singly effectiveness accoutre profitable has Vs = ±15V. VL(Max) does referable substitute, and neither does the Iprepossession exactment. But VL(worst), PD(worst, collocateB) , and PDQ do. What are their values?

D) What is  (worst,total)?

e) What greatness excitement sinks  are needed control each transistor if we exact a prophylactic margin  = 25 C

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