0
4.3kviews
What are different possible IC 723 based voltage regulators.Design voltage regulator to achieve Vo = 12V and Io = 1Amp .
1 Answer
written 8.8 years ago by |
This is a High Voltage and High Current Circuit.
VO=VREF(1+R1R2) Assume R2 = 10KΩ and VREF = 7.15V 12=7.15(1+R110KΩ) R1=6.78KΩ
R3=R1||R2 R3=6.78K||10K R3=4.04KΩ
RA=(∝1−∝)RB.........(1) ∝=0.7Regulatedoutput(ILMAXISC−1) Assume, ISC = 200mA ∝=0.712(1A200mA−1) ∝=0.233 Substitute value of α in equation (1) and Assume RB = 10KΩ RA=(0.2331−0.233)×10KΩ RA=3.03KΩ
RSC=VSENSEISC(1−∝) Assume VSENSE = 0.5V RSC=0.5200m(1−0.233) RSC=3.25Ω
PDT3=VCE3×IC3 PDT3=(Vin−VO)×IC3 Let Vin = 2VO = 2×12=24V PDT3=(24−12)×1 PDT3=12W
β=ILIB=1A150mA Assume IB = 150mA β = 6.66
Select transistor whose PDT3 ≥ 12W and β ≥ 6.66
RL=VOIL
RL=121
RL=12Ω