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LM1296N データシート(PDF) 5 Page - National Semiconductor (TI) |
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LM1296N データシート(HTML) 5 Page - National Semiconductor (TI) |
5 / 10 page Block Diagram Functional Description The LM1296 outputs a sawtooth and a variable DC voltage for the vertical deflection amplifier. It also provides the hori- zontal deflection output circuit with a waveform for Trap- ezoid, Pincushion and Corner correction. Referring to Figure 3, pin 7 (V SYNC) goes to the Sync Po- larity Correction Block that accepts either positive-going or negative-going sync signals. The polarity-corrected sync is sent to the Injection-Locked Oscillator so that the sawtooth generated is synchronized with the vertical sync. With no sync signal AC-coupled to pin 7, the oscillator free runs at typically 40 Hz. There are three capacitors and one control pin connected to the Sawtooth Waveform Generation Block. C OSC is the tim- ing capacitor for the Injection-Locked Oscillator. C F is the fil- ter capacitor for an internal circuit that detects the existence of vertical sync and prevents the Injection-Locked Oscillator from locking at twice the vertical sync frequency. C ALC is for the automatic level control (ALC) circuit. The ALC circuit maintains the sawtooth output amplitude, which is set by the DC voltage at pin 2 (HEIGHT), regardless of the vertical sync frequency. Since the output sawtooth goes to the geometry correction circuit as well, the correction waveform generated tracks the sawtooth amplitude, i.e., the height of the CRT raster. The S Correction block shapes the linear sawtooth into an S-shape sawtooth. Pin 15 (SAWTOOTH OUT) outputs the buffered S-shape sawtooth. The amount of S correction is controlled by the DC voltage at pin 16 (S). Referring to Figure 4, the extent of S correction is defined by the following equation. k S = (∆A1 + ∆A2)/2A x 100% The LM1296 is designed to drive an external vertical deflec- tion amplifier that is operating with positive and negative power supplies. The LM1296 outputs an S-corrected saw- tooth with a DC level that is typical 3.85V. Pin 13 (DC OUT) provides a DC voltage of 3.85V ± 200 mV. By applying a DC control voltage to pin 1 (POSITION), the output voltage at pin 13 can be varied. This sets the output DC current from the vertical deflection amplifier, which in turn sets the raster ver- tical position. DS012894-9 FIGURE 3. DS012894-10 FIGURE 4. 5 www.national.com |
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同様の説明 - LM1296N |
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