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TEA2128 датащи(PDF) 7 Page - STMicroelectronics

номер детали TEA2128
подробное описание детали  COLOR TV SCANNING AND POWER SUPPLY PROCESSOR
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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TEA2128 датащи(HTML) 7 Page - STMicroelectronics

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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.
TEA2128
7/8


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