HiTi Digital 630PS, Service Manual, Page: 23 / 80

Ver. Ex.1.1
Confidential
2003/7/8
3.4 Power Board
It contains the Transformer, Snubber Circuit, and Power MOS. The function of
Sunbber Circuit is reducing the transient Spike Voltage Power MOS produces
when MOS be turned off. It prevents the Power MOS to be destroyed by the
transient Spike Voltage. Transformer is the component which transforms
energy. It is also separateness of the primary and secondary. It can use
proportion of coils to change the voltage between primary and secondary. The
Power MOS is controlled with UC3842A to switch energy of Transformer so
that is able to regulate Output Voltage.
Fig 25 Power Board
CompactFlash
SmartMedia
Card b/d power
Power control IC EL Cap. (SMD)
Card b/d I/F