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LM1247 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM1247 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 48 page Pin Descriptions and Application Information (Continued) Pin No. Pin Name Schematic Description 19 20 21 Green Output Red Output Blue Output These are the three video output pins. They are intended to drive the LM246x family of cathode drivers. Nominally, about 2V peak to peak will produce 40V peak to peak of cathode drive. 22 ABL The Automatic Beam Limiter input is biased to the desired beam current limit by R ABL and VBB and normally keeps D INT forward biased. When the current resupplying the CRT capacitance (averaged by C ABL) exceeds this limit, then DINT begins to turn off and the voltage at pin 22 begins to drop. The LM1247 then lowers the gain of the three video channels until the beam current reaches an equilibrium value. 23 CLAMP This pin accepts either TTL or CMOS logic levels. The internal switching threshold is approximately one-half of V CC. An external series resistor, R 31, of about 1K is recommended to avoid overdriving the input devices. In any event, R EXT must be large enough to prevent the voltage at pin 23 from going higher than V CC or below GND. 24 H Flyback Proper operation requires current reversal. R H should be large enough to limit the peak current at pin 24 to about +4 ma during blanking, and −500 µA during scan. C 17 is usually needed for logic level inputs and should be large enough to make the time constant, R HC17 significantly larger than the horizontal period. R 34 and C8 are typically 300 Ω and 330 pF when the flyback waveform has ringing and needs filtering. C 18 may be needed to filter extraneous noise and can be up to 100 pF. www.national.com 11 |
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