LA7837 PDF

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The interlace and crossover distortion responses, in particular, have been greatly improved, allowing excellent picture quality on large size televisions and high precision interlace mode displays. Also, pulse signals can be used for input signals due to the on-chip sawtooth wave generating circuit and driver circuit. Further, the DC and AC feedback circuit can be formed with these ICs alone, simplifying pattern design of sets and ensuring stable performance.

The LA has a maximum deflection current of 1. The LA has a miximum deflection current of 2. The vertical output ICs LA, are appropriate for use in monitors and displays because the interlace and crossover distortion responses are superior to those of the LA, However, since the vertical retrace time of displays is shorter than that of TV, the upper portion of the vertical picture may stretch.

This is because the start waveform of the pin 6 sawtooth wave bends, as shown in Fig. If there is not much time difference between T1 ant TR, the upper portion of the vertical picture will tend to stretch. The use of a circuit will cause pin 6 waveform start wave to become linear, so that stretching is suppressed. Therefore, the discharge circuit and clamp circuit are formed by the external Zener diode and transistor TR2.

The LA, can also be used in a vertical frequency multi-sync system. The LA, do not have an on-chip vertical oscillation circuit, so they operate merely by impressing a trigger pulse e. However, there are two problems with using the LA, as are in a multi-sync system. One is vertical amplitude. When the trigger pulse changes between 40 to 80Hz, the vertical frequency will rise and amplitude size decreases because pin 6 cycle T1, T2 in the diagram below becomes shorter.

The vertical output IC LA, are appropriate for use in monitors and displays because the interlace and crossover distortion responses are superior to those of the LA, This is because the start waveform of the pin 6 sawtooth wave bends, due to the diode response of the clamp waveform.

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