Philips DPTV400 Series, Training Manual

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ATSC Power Interface for HD version (Figure 9)
The ATSC Power Interface module produces the operating voltages for the ATSC module. The +15,
3.5, 4.5, and 5.2-volt supplies from the AC Input panel are fed to the Interface module. The
Processor on the SSB provides a On/Off command to switch the outputs. In the Standby mode, the
On/Off line is High. This switches transistor 7202 On, which turns transistors 7206, 7204, and 7205
On. This turns the Regulators 7101, 7102, 7103, 7105, and 7104 Off. When the set is turned On,
the On/Off line goes Low, switching 7202 Off which turns 7206, 7204, and 7205 Off. This turns
Regulators 7101, 7102, 7103, 7105, and 7104 On. The output of 7101 turns transistors 7203 On to
switch the 5.2-volt supply to the ATSC module. A 12-volt, 5.2-volt, two 1.2-volt, 2.5-volt, and 3.3-volt
supplies are fed to the ATSC module. Sense line from the ATSC module for the two 1.2-volt and the
2.5-volt supplies provides precise regulation for those supplies.
FIGURE 9 - ATSC POWER INTERFACE - HD VERSION
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