Hitachi C28W440N, Service Manual

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20
•
Split supply
•
High output power: 25+25 W @ TDA = 10%, R
L
= 8ohm, V
S
= ±20V
• No pop at turn-on / off
•
Mute (pop free)
• Stand-By feature (low I
Q
)
•
Few external components
•
Thermal overload protection
•
Adjustable gain via an external resistor
16.4.2.
Pinning:
1. Output (1)
2. +Vs
3. Output (2)
4. Mute / St-By
5. -Vs
6. Input (2)
7. Ground
8. Input (1)
16.5.
TDA6108Q:
The TDA6108Q consists of three monolithic video output amplifiers. The amplifier can be seen as an operational
amplifier with negative feedback. The advantage of negative feedback is that the amplifier characteristics do not
play an important role up to certain frequencies. The internal flash diodes protect the amplifiers against flash over
in the picture tube. The only protections required at the cathode outputs are a flash resistor and a spark gap.
Furthermore, the device needs only one power supply voltage (Vdd). The TDA6108Q is provided with a black
current data pin.
16.5.1.
Features:
•
No external components, only the well known supply decoupling
•
Very simple application with a variety of colour decoders
•
Black-current measurement output for automatic black current stabilisation
•
Only one supply voltage needed
•
Internal protection against positive appearing CRT flash-over discharges
•
Protection against ESD
•
Internal reference voltage
•
Thermal protection
•
Controllable switch-off behaviour
PINNING PIN VALUE
1. Inverting input 1 :2Vpp
2. Inverting input 2 :2Vpp
3. Inverting input 3 :2Vpp
4. Ground
5. BSC-output :Max:7V
6. Supply voltage :200VDC
7. Cathode output 3 :20mA, 100Vpp
Wide supply voltage range (up to 50V ABS Max.)
16.4.1
Features
8. Cathode output 2 :20mA, 100Vpp
9. Cathode output 1 :20mA, 100Vpp