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TDA8215B 데이터시트(PDF) 6 Page - STMicroelectronics |
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TDA8215B 데이터시트(HTML) 6 Page - STMicroelectronics |
6 / 9 page The oscillator thresholds are internally fixed by resistors. The discharge of the capacitor depends on the internal resistor R4. The control voltage is applied on resistor R5. 11 Phase comparator output R5 R4 Vcc1 Figure 3 : Line Oscillator Line Flyback Sync pulse Output Current Vc Integrated Flyback Figure 4 : Phase Comparator The sync-pulse drives the current in the compara- tor. The line flyback integrated by the external net work gives on pin 13 a saw tooth, the DC offset of this saw tooth is fixed by VC. The comparator output provides a positive current for the part of the signal on pin 13 greater than to VC and a negative current for the other part. When the line flyback and the video signal are synchronized, the output of the comparatoris an alternatively negative and positive current. The frame sync-pulse inhibits the compa- rator to prevent frequency drift of the line oscillator on the frame beginning. 13 12 Vcc1 Vc SL2 ST1 Figure 5 Line output (Pin 17) It is an open-collector output. The output negative pulse time is 22 µs for a 64µs period. The oscillator thresholds are internally fixed by resistors. The oscillator is synchronized during the last half free run period. The input current during the charge of the capacitor is less than 100nA. TDA8215B 6/9 |
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