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LM1237 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM1237 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 42 page Pin Descriptions and Application Information (Continued) Pin No. Pin Name Schematic Description 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 LM1237 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 ohms 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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