поискавой системы для электроныых деталей |
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TEA2128 датащи(PDF) 7 Page - STMicroelectronics |
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TEA2128 датащи(HTML) 7 Page - STMicroelectronics |
7 / 8 page 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 |
Аналогичный номер детали - TEA2128 |
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Аналогичное описание - TEA2128 |
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