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2. Circuit Operating Description
2-1 SMPS circuit description
2-1-1 Comparison between linear power supply and SMPS
2-1-1(a) LINEAR
Common power
(Ex.220V60Hz)
3 Waveform/Description
Vs
0
Vs
0
Vout
0
Samsung Electronics
+
Vp
–
(Np)
220 2 V
t
20us
Fig. 2-2
t
Fig. 2-3
Fig. 2-4
Vout
+
+
Vs
–
(Ns)
Fig. 2-1
Input : Common power to transformer(Vp)
The output Vs of transformer is determined by the ratio of
1st Np and 2st Ns.
Vs = (Ns/Np) x Vp
Vout is output (DC) by diode and
condensor.
t
Vreg
Regulator
2-1
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