TDA9535

4/9

TYPICAL APPLICATION

PC Board Lay-out

The best performance is obtained with a carefully

designed HF PC board, especially for the output

and input capacitors.

Rise/fall time and bandwidth are measured on

a 10pF load. The best rise/fall times and band-

width results will be obtained with low Rp resistor

value while the best CRT arcing protection will be

obtained by a high Rp resistor value. Finally a val-

ue between 150 and 220

Ω is a good compromise.

Power Dissipation

The power dissipation is the sum of the DC and

the dynamic dissipation.

As the feedback resistors are integrated, the DC

power dissipation (capacitive load) can be estimat-

ed by:

The dynamic dissipation in the worst case (full

bandwidth and black pixel/white pixel picture

(note 2) is:

where f is the video frequency and K the active line

duration / total duration.

Example:

Note: 2

This worst thermal case must only be

considered for TJmax calculation.

Nevertheless, during the average life of the

circuit, the conditions are very close to the

white picture conditions.

TDA9535

75

Ω

IN1

3

7

9

IN2

IN3

GND3

OUT3

GND2

GND1

OUT2

OUT1

1

2

5

6

11

10

4

8

75

Ω

75

Ω