TDA9108 datasheet(8/9 Pages) STMICROELECTRONICS

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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







100

− 0.25



−

tfly

≤ td

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

position (phase shifter saturation)

(2)

≤ 0.36 Hp -

tfly

-2

µs

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

position (phase shifter saturation)

HORIZONTAL

FLYBACK

HORIZONTAL

DRIVE

BU OFF

HORIZONTAL

DRIVE

BU OFF

VPin 13

Equation (2)

Equation (1)

H-drive trailing

edge limit

H-drive leading

edge limit

Figure 5

TDA9108

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