Samsung DVD-E360 Service Manual page 61

Service manual dvd player dvd-e360

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6. Schematic Diagrams

3) Driving circuit

When Vin supplied, driving current Ig occurs throuhg the PICF1. By this I1 (=Hfe x Ig) occurs throug the PICF1 and the Vb is inducted to base winding coil NB. By inducted Vb, Ib start flow and the VCC voltage of PQR11 is sustained stable. Ib is constant and

I1 increases in Proportion to time. After constant time passed Ib become to shortage and PICF1 is cut OFF (S/W OFF).

4) Feedback Control Circuit

• Operation descriptions

a) Internal OP-Amp '+' base potential of PICS2 is 2.5V and external "-" input potential is connected with PRS33 and PRS34 to maintain Vout of 4.4V.

6-4

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