Daewoo DTD-21H9, Service Manual, Page: 26 / 46

CP-093F Service Manual
5.3 TDA8357J VERTICAL AMPLIFIER
The TDA8357J are power circuit for use in 90° and 110° colour deflection systems for field
frequencies of 25 to 200Hz field frequencies, and for 4:3 and 16/9 picture tubes. The IC contains
a vertical deflection output circuit, operating as a high efficiency class G system. The full bridge
output circuit allows DC coupling of the deflection coil in combination with single positive supply
voltages.
The IC is constructed in a Low Voltage DMOS(LVDMOS) process that combines bipolar, CMOS
and DMOS devices. DMOS transistors are used in the output stage because of the absence of
second breakdown.
5.3.1 TDA8357J
Features :
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Few external components
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Highly efficient fully DC-coupled vertical bridge output circuit
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Vertical flyback switch with short rise and fal times
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Built-in g uard circuit
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Thermal protection circuit
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Improved EMC performance due to differential inputs
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