Circuit Descriptions - Samsung DVD-808K Service Manual

7. Circuit Descriptions

7-1 SMPS
7-1-1 Comparison between linear power supply and SMPS
7-1-1(a) LINEAR
Common power
(Ex.220V60Hz)
3 Waveform/Description
Vs
0
Vs
0
Vout
0
Samsung Electronics
+
Vp
–
(Np)
Fig. 7-1
220 2V
20µs
Fig. 7-2
Fig. 7-3
Fig. 7-4
+
Vs
–
(Ns)
Linear Power Supply
Input : Common power to transformer(Vp)
t
The output Vs of transformer is determined by the ratio of
1st Np and 2st Ns.
t Vs = (Ns/Np) x Vp
Vout is output (DC) by diode and
condensor.
t
Vout
Regulator
+
Vreg
7-1