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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA4858 датащи(PDF) 9 Page - NXP Semiconductors |
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TDA4858 датащи(HTML) 9 Page - NXP Semiconductors |
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9 / 44 page  1997 Oct 27 9 Philips Semiconductors Product specification Economy Autosync Deflection Controller (EASDC) TDA4858 Table 2 Calculation of fosc(V) total spread Result for 50 to 110 Hz application: Application hint: VAGC (pin 22) has a high input impedance during scan, thus the pin must not be loaded externally. Otherwise non-linearities in the vertical output currents may occur due to the changing charge current during scan. Application hint: The full vertical sync range of 1 : 2.5 can be made usable by incorporating an adjustment of the free-running frequency. Also the complete sync range can be shifted to higher frequencies (e.g. 70 to 160 Hz) by reducing the value of CVCAP. Adjustment of vertical size, vertical shift and S-correction VPOS (pin 17) is the input for the DC adjustable vertical picture shift. This pin provides a phase shift at the sawtooth output VOUT1 and VOUT2 (pins 13 and 12) and the EW drive output EWDRV (pin 11) in such a way, that the whole picture moves vertically while maintaining the correct geometry. The amplitude of the differential output currents at VOUT1 and VOUT2 can be adjusted via input VAMP (pin 18). This can be a combination of a DC adjustment and a dynamic waveform modulation. VSCOR (pin 19) is used to adjust the amount of vertical S-correction in the output signal. The adjustments for vertical size and vertical shift also affect the waveforms of the EW parabola and the vertical S-correction. The result of this interaction is that no readjustment of these parameters is necessary after an adjustment of vertical picture size or position. Application hint: VPOS is a current input, which provides an internal reference voltage while IVPOS is in the specified adjustment current range. By grounding VPOS (pin 17) the symmetrical control range is forced to its centre value. Contributing elements Minimum frequency offset between fosc(V) and lowest trigger frequency ±10% Spread of IC ±3% Spread of RVREF ±1% Spread of CVCAP ±5% Total 19% f osc V () 50 Hz 1.19 --------------- 42 Hz == Application hint: VSCOR is a current input at 5 V. Superimposed on this level is a very small positive-going vertical sawtooth, intended to modulate an external long-tailed transistor pair. This enables further optional DC controls of functions which are not directly accessible such as vertical tilt or vertical linearity (see Fig.17). EW parabola (including horizontal size and trapezium correction) EWDRV (pin 11) provides a complete EW drive waveform. EW parabola amplitude, DC shift (horizontal size) and trapezium correction can be controlled via separate DC inputs. EWPAR (pin 21) is used to adjust the parabola amplitude. This can be a combination of a DC adjustment and a dynamic waveform modulation. The EW parabola amplitude also tracks with vertical picture size. The parabola waveform itself tracks with the adjustment for vertical picture shift (VPOS). EWWID (pin 32) offers two modes of operation: 1. Mode 1 Horizontal size is DC controlled via EWWID (pin 32) and causes a DC shift at the EWDRV output. Also the complete waveform is multiplied internally by a signal proportional to the line frequency (which is detected via the current at HREF (pin 28). This mode is to be used for driving EW modulator stages which require a voltage proportional to the line frequency. 2. Mode 2 EWWID (pin 32) is grounded. Then EWDRV is no longer multiplied by the line frequency. The DC adjustment for horizontal size must be added to the input of the B+ control amplifier BIN (pin 5). This mode is to be used for driving EW modulators which require a voltage independent of the line frequency. EWTRP (pin 20) is used to adjust the amount of trapezium correction in the EW drive waveform. Application hint: EWTRP (pin 20) is a current input at 5 V. Superimposed on this level is a very small vertical parabola with positive tips, intended to modulate an external long-tailed transistor pair. This enables further optional DC controls of functions which are not directly accessible such as EW-corner, vertical focus or EW pin balance (see Fig.17). Application hint: By grounding EWTRP (pin 20) the symmetrical control range is forced to its centre value. |
Аналогичный номер детали - TDA4858 |
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Аналогичное описание - TDA4858 |
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