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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LM2467 Arkusz danych(PDF) 13 Page - National Semiconductor (TI) |
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LM2467 Arkusz danych(HTML) 13 Page - National Semiconductor (TI) |
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13 / 43 page  Pin Descriptions and Application Information (Continued) Pin No. Pin Name Schematic Description 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 13 |
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