Circuit Operating Descriptions

Advantages and disadvantages of linear power supply

1)Advantages : Little noise because the output waveform of transformer is sine wave.

2)Disadvantages :

ŒAdditional margin is required because Vs is chan- ged (depending on power source). (The regulator loss is caused by margin design).

´ Greater core size and condensor capacity are ne- eded, because the transformer works on a single power frequency.

Change by common power

v

Vout

 

Vreg

 

0

t

Regulator loss

Fig. 13-5

13-1-1 (b) S.M.P.S. (Pulse Width Modulation)

Transformer

(Np)

(Ns)

+

+

(Vp)

(Vs)

+PICF1

Vin

CTL IC

PWM CTL + MOS Fet

Fig. 13-6

Terms

1)1st : Common power input to 1st winding.

2)2nd : Circuit followings output winding of transformer.

3)f (Frequency) : Switching frequency (T : Switching cycle)

4)Duty : (Ton/T) x 100

Vin

Vout

REGULATOR

+

+

 

13-2

Samsung Electronics

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Samsung DVD-P355B/XEU 13-1-1 b S.M.P.S. Pulse Width Modulation, Advantages and disadvantages of linear power supply

DVD-P355B/XEL, DVD-P355B/XEU, DVD-P355B/XET, DVD-P355B/XEV, DVD-P355B/FOU specifications

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