TEA2128 データシートの表示（PDF） - STMicroelectronics

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TEA2128

COLOR TV SCANNING AND POWER SUPPLY PROCESSOR

STMicroelectronics 

TEA2128

This information may be used for timing research

in the case of frequency or voltage synthetizer type

receivers and for audio muting.

O.S.D. Mode

The O.S.D. (On Screen Display) function is avail-

able when Pin 14 is switch to ground. This function

fixes line and frame frequencies to standard deflec-

tion frequencies (fH = 15.6kHz, fV = 50Hz) and in-

hibits Φ1 PLL. This allows to have a stable text

display when no signal is coming from antenna.

Switch Mode Power Supply Secondary to Pri-

mary Regulation

This power supply uses a differential error amplifier

with an internal reference voltage of 1.3V and a

phase modulator operating at the line frequency.

The power transistor is turned-off during the line

retrace by the falling edge of the horizontal saw-

tooth.

The maximum conduction angle may be monitored

by forcing a voltage at Pin 9. This pin can also be

used for current limitation.

The output pulse is sent to the primary IC

(TEA2260/61 via a low cost synchro transformer).

S.M.P.S. Start-up Processor

The ”soft-start” device imposes a very small con-

duction angle on starting-up. This angle progres-

sively increases to its nominal regulation value.

On starting-up the horizontal scanning function

comes into operation at VCC = 7V. The power

supply then comes into operation progressively.

Frame Blanking Safety Input (Pin 15)

The frame blanking safety checks the normal frame

scanning. In the event of vertical scanning failure,

the frame blanking level goes high to protect the

CRT.

7/8

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