Circuit Descriptions - Samsung DVD-A500 Service Manual

6. Circuit Descriptions

6-1 S.M.P.S.
6-1-1 Comparsion between Linear Power Supply and S.M.P.S.
6-1-1 (a) Linear
Common power
(Ex.120/220V 50/60Hz)
Waveform/Description
Vs
0
Vs
0
Vout
0
Samsung Electronics
+
Vp
–
(Np)
Fig. 6-1 Linear Power Supply
t
Fig. 6-2
t
Fig. 6-3
t
Fig. 6-4
+
+
Vs
–
(Ns)
Input : Common power to transformer (Vp).
The output Vs of transformer is determined by the ratio
of 1st Np and 2nd Ns.
Vs = (Ns/Np) x Vp
Vout is output (DC) by diode and condensor.
Vout
REGULATOR
Vreg
6-1