Download - Linear Regulator
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Linear regulator 7805
Linear power supply
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Linear regulator
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Linear regulator 7805
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Linear regulator 7805
7805 Positive regulator
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Linear regulator 7905
7905 Negative regulator
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Linear regulator 7805 / 7905
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Linear regulator 7805
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Linear regulator 7805
• SOA = Safety Operating Area• Uinmax / Uout defined • Imax defined• Pmax Umax * Imax
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
• Regulator measures the output voltage all the time;
• Q: Is the output voltage too small? A: Yes! => Action: Increase the output voltage/current!
• Q: Is the output voltage too small? A: No, it is too high! => Action: Decrease the output voltage/current!
• Q: Is the output voltage too small? …• =>Oscillation
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Linear regulator 7805Output voltage without capacitor
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Linear regulator 7805
• High frequency oscillation disturbs the operation of the equipment that regulator is used for.
• Oscillation consumes additional energy =>increased power loss => more heat
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Linear regulator 7805
Input current = output current (even more)
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
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Linear regulator 7805
Vin = 7,02 VVout = 5,02 VV dropout = 2,00 VRL = 1000 f = 50 Hz
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Linear regulator 7805
RL = 100 f = 50 Hz
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Linear regulator 7805
RL = 1000 Vin = 6,9 V Vac = 20 Vpp
f / Hz Vout / V picture50 4,99 1
100 5,02 2500 5,02 3
1000 5,02 45000 5,02 5
15000 5,02 620000 5,02 7
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Linear regulator 7805
picture1 picture 2
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Linear regulator 7805
picture 3 picture 4
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Linear regulator 7805
picture 5 picture 6
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Linear regulator 7805
picture 7
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Linear regulator 7805
RL = 100Vin = 3,87 V (DMM) ? Vac = 20 Vpp
f / Hz Vout / V (Dmm) 50 2,40 ?
100 ?500 ?
1000 ?5000 ?
15000 ?20000 ?
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Linear regulator 7805
f=50Hz RL =100 f=100Hz RL =100
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Linear regulator 7805
f=500Hz RL =100 time scale made wider
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Linear regulator 7805
f=1000Hz f= 5000HzRL = 100
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Linear regulator 7805
f=15000Hz f= 20000HzRL = 100
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Linear regulator 7805
max output from generator
after half-waverectification
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Linear regulator 7805
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Linear regulator 7805
• A current i(t) in a pure resistor R results in a power p(t) with an average value P
• This same power P could be produced by a constant (direct) current I. Then i(t) is said to have an effective value IRMS equivalent to this constant current. The same applies to voltage functions where effective value in VRMS
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Linear regulator 7805
Half wave rectified voltage Root Mean Square = RMS = effective value
Vin max (from generator output) 20 Vpp
T
RMS dttVT
V0
2 )(1
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Linear regulator 7805
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Linear regulator 7805
xxxdx 2sin41
2sin 2
substitution:
0sin41
202sin
41
22102
2RMSV
=0 =0 = 0
52
104
1022
RMSRMS VV
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Linear regulator 7805
• Generator output impedance (internal R) = 50
• Voltage drop across diode = 0,7V (not taken into account)
• Using higher frequency eliminates the need of big capacitor
• With low-ohmic loads full-wave rectifier highly recommended