TDA9108 Ver la hoja de datos (PDF) - STMicroelectronics

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TDA9108

MONITOR HORIZONTAL PROCESSOR

STMicroelectronics 

TDA9108

X-Ray Protection Input (Pin 8)

When the voltage on this pin becomes higher then

2.9V (typ.), the horizontal outputs are inhibited

(Pins 2 and 3) and will remains in this condition until

a reset is made on supply voltage (power-

off/power-on).

H-Duty Cycle (see Figure 5)

The output duty cycle is variable between 0 and

50% by varying the voltage on Pin 4.

In order to maintain ± 5% horizontal phase adjust-

ment possibilities the following equation must be

respected.

(1)

Hperiod

1t0p0

−

0.25



−

tfly

2

≤

td

(2)

td

≤

0.36

Hp

-

tfly

2

-

2µs

⇒ If not, tp will decrease because of H-drive trailing edge wrong

position (phase shifter saturation)

⇒ If not, tp will decrease because of H-drive leading edge wrong

position (phase shifter saturation)

Figure 5

VPin 13

H-drive leading

edge limit

HORIZONTAL

DRIVE

HORIZONTAL

DRIVE

Equation (2)

BU OFF

HORIZONTAL

FLYBACK

BU OFF

H-drive trailing

edge limit

Equation (1)

8/9

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