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TDA9103-USER

TDA9103 USER’S MANUAL DEMONSTRATION BOARD

STMicroelectronics 

TDA9103 USER’S MANUAL DEMONSTRATION BOARD

II.1.2 - Control Board

This board, required by the first and quick evalu-

ation, is intended to be separated from the main

board for the connection to a monitor when we will

use the command from the microprocessor.

On this board, we find 11 potentiometers for the

generation of the control voltages in the range 0-5V

(use of an external power supply).

In addition, thanks to a small circuit with a

monostablegenerating a pseudo horizontal flyback

pulse ; the demoboard can be used without con-

necting it to a monitor.

The width and the delay of the pseudo Hflyback can

be adjusted by the trimmers P1 and P2.

II.2 - Instructions for Use

II.2.1 - Stand Alone Mode

This demoboard is able to work alone by using :

- The analog command from the control board,

- A pseudo Hflyback from the control board,

- A local B+ regulation.

The value of B+ is preset to 100V. This value can

be be changed by changing the divider R65-R66.

- Configure the two jumper as following (see Fig-

ure 2) :

• SW1 position 1,

• SW2 position 1.

- Connect the following power supply :

• +12V between J3 and J19,

• -12V between J21 and J19,

• +5V between JC4 and JC26,

• 45V 2A between J12 and J20,

Figure 2

1

SW2

2

R72

SW2 TP9

TP8

R68

R26

R67 R73

C33

SW1

IC1

R71

C35

1

SW1

2

C45

S1

C36

C1

C2

C9 C34

R32 R31

• 24V between J24 and J20 (these power sup-

plies are only required for SMPS, LINE DRIVER

and EW amplifier testing).

- Connect the following loads on all the outputs

(Figure 4).

- Connect Hsync and Vsync from the pattern gen-

erator on J2 and J5 respectively.

II.2.2 - Connection to a Monitor Chassis

II.2.2.1 - Analog Command and B+ Regulation

Configure SW1 in position 2 and connect the board

to the chassis (see Figure 5).

II.2.2.2 - Analog Command and EHT Regulation

Configure SW2 in position 2, connect the board as

before and connect the HVFEED inputs with a

shielded cable (see Figure 3).

The value of R79 is suitable for getting 25kV approx

high voltage value with a standard EHT trans-

former.

When the EHV regulation loop is acting correctly,

the voltage at J25 is ≈5V (depending on the B+

adjust (pin 39) voltage.It’s easy to calculate the

value of R79 if the equivalent resistance Req of the

bleeder is different of the one used to develop this

demoboard :

R79

≈

5 ⋅ Req

EHV

II.2.2.3 - Commands from Microprocessor

Break off the control board and connect the appro-

priate outputs of the micro on the connectors J1B,

J2B and J3B.

Figure 3

J25

R79

75kΩ

TP10

DEMOBOARD

EHT

TRANSFORMER

FOCUS

SCREEN

3/10

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