TDA9536 datasheet(4/9 Pages) STMICROELECTRONICS

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TDA9536

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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 time and bandwidth

results will be obtained with low Rp resistor value

while the best CRT arcing protection will be ob-

tained by a righ Rp resistor value. Finally a value

between 150 and 200

Ω is agood 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:

PSTAT =VDD .IDD +VCC .ICC

The dynamic dissipation in worst case (full band-

width and black pixel/white pixel picture - Note 2)

is:

PDYN =3 VDD .CL .VOUT(PP) . f.K

where f is the video frequency and K the active line

duration / total duration.

Example:

for VDD = 110V, VCC = 12V, VOUT =40 VPP,

IDD = 25mA, ICC = 60mA, fVIDEO = 40MHz,

CL = 8pF and K = 0.72.

We have: PSTAT = 3.47W and PDYN =3.04W

Therefore: Ptot = 6.51W.

Note: 2

This worst thermal case must be considered

only for TJmax calculation. Nevertheless,

during the average life of the circuit, the

conditions are very close to the white picture

conditions.

Figure 1.

TDA9536

Ω

IN1

IN2

IN3

GND3

OUT3

GND2

GND1

OUT2

OUT1

Ω

VDD

VCC

VDD 110V

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