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TDA16846G 데이터시트(PDF) 14 Page - Infineon Technologies AG |
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TDA16846G 데이터시트(HTML) 14 Page - Infineon Technologies AG |
14 / 28 page TDA 16846 TDA 16847 Data Sheet 14 2000-01-14 Fixed Frequency and Synchronization Circuit SYN (Pin 7) Figure 11 shows the Fixed Frequency and Synchronization Circuit. The circuit is disabled when Pin 7 is not connected. With R 7 and C7 at Pin 7 the circuit is working. C7 is charged fast by approx. 1 mA and discharged slowly by R 7 (Figure 11). The power transistor is switched on at beginning of the charge phase. The switching frequency is (charge time ignored) : When the oscillator circuit is working the Fold Back Point Correction is disabled (not necessary in fixed frequency mode). “Switch on” is only possible when a “zero crossing” has occurred at Pin 3, otherwise “switch-on” will be delayed (Figure 12). Figure 11 Synchronization and Fixed Frequency Circuit f 1,18 R 7 C 7 × -------------- ≈ AES02656 15 k Ω 75 k Ω 5 V 7 R C7 SYN 7 Logic OUT RZI 13 3 Zero Crossing Signal External Internal 30 OP1OUT OP1 k Ω LO |
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