Teac EU-34HT, Service Manual

8

TDA8356:

General Description:

The TDA8356 is a power circuit for use in 90ø colour deflection system for field frequencies of 50 to 120 Hz.

The circuit operates as a highly efficient class G system.

Features:

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Few external components

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Highly efficient fully DC-coupled vertical output bridge circuit

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Vertical flyback switch

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Guard circuit

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Protection against:

 - short-circuit of the output pins (7 and 4)

     - short-circuit of the output pins to Vp

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Temperature (thermal) protection

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High EMC immunity because of common mode inputs

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A guard signal in zoom mode

PINNING

PIN VALUE

1. Input power-stage (positive); includes Ii(sb) signal bias : 400mA, Min : 50mA, Max : 500mA

2. Input power-stage (negative); includes Ii(sb) signal bias : 400mA, Min : 50mA, Max : 500mA

3. Operating supply voltage

: +15VDC

4. Output voltage B

: Max : 52V  Output current : 2App (TDA8356) 3App (TDA8351)

5. Ground

6. Input flyback supply voltage

: Min : Vp, Max : 50V

7. Output voltage A

: Max : 52V  Output current : 2App (TDA8356) 3App (TDA8351)

8. Guard output voltage

: Max:5.5V (Io:100mA)

9. Input feedback voltage

: Max:52V

TDA6107Q:

The TDA6107Q includes three video output amplifiers in a SIL 9 MP (Single In Line 9 pins Medium Power) package SOT111BE,

using high-voltage DMOS technology, and is intended to drive the three cathodes of a colour picture tube.

In contrast to previous types of DMOS video amplifiers, all external resistors (Rf, Ri and Ra) are integrated, so the gain is fixed

and it saves 9 resistors.

To obtain maximum performance, the amplifier should be used with black-current control and mounted on the CRT panel.

Features:

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Bandwith: 4.0 MHz typ at 100Vpp (Measured in appli,cation set-up, with Rfl=1K5 and Cl=Ctube+Cpcb=10pF)

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Slewrate: 950V/ms

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Fixed gain of 50 times

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No external components, only the well known supply decoupling

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Very simple application with a variety of colour decoders

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Black-current measurement output for automatic black current stabilization

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Only one supply voltage needed

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Internal protection against positive appearing CRT flash-over discharges

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Protection against ESD

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Internal reference voltage

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Thermal protection

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Controllable switch-off behaviour

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Very small PCB dimensions

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Very high replacement value

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

8. Cathode output 2

: 20mA, 100Vpp

9. Cathode output 1

: 20mA, 100Vpp

MC44604:

General description:

The MC44604 is an enhanced high performance controller that is specifically designed for off-line and DC-to-DC converter applications.

It offers a really safe and reliable power management thanks particularly to its protection features (foldback, overvoltage detection,

soft start, accurate demagnetization detection). Its high current totem pole output is also ideally suited for driving a power

MOSFET, but can also be used for driving a bipolar transistor in low power converters. In addition to these features,

the MC44604 offers an efficient stand-by mode.

Features:

Current Mode Controller

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Operation up to 250 kHz Output Switching Frequency

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Inherent Feed Forward Compensation

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Latching PWM for Cycle-by-Cycle Current Limiting

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Oscillator with Precise Frequency Control