Changhong Electric 21BM91, Руководство по обслуживанию, Страница: 40 / 58

SERVICE MANUAL
5. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041
Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little bit
difference between the two amplifiers, that is, LA78040 has supply voltage of 24V and output current of
1.8A
P-P
while LA78041 has supply voltage of 30V and output current of 2.2A
P-P
.
LA78040 /LA78041
Vertical Deflection Output Circuit
1). Features
·Low power dissipation due to built-in pump-up circuit
·Vertical output circuit
·Thermal protection circuit built in
·Excellent crossover characteristics
DC coupling possible Fig. 17
2). Block Diagram
Package Type: TO-220-7H
Fig. 18
3) Refer to Table 22 about Functions and Data of the IC’s Pins.
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