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TDA9102C Datasheet(PDF) 5 Page - STMicroelectronics |
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TDA9102C Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 7 page ELECTRICAL CHARACTERISTICS (continued) (Tamb = 25 oC, VS = 12V, refer to the test circuits, unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. Unit VERTICAL SECTION K17 Frequency drift versus supply voltage K17 = dF . 10 6 dV . fV VS = 10.5V to 15.5V 300 ppm V 1 2 C2 R1 R2 I1 if C1 C3 R3 3 HOR. SYNC. ϕ1 HORIZONTAL OSCILLATOR V 3L V3H V3H VDC V DC V 3L V (V) t (s) VL = 5.2V = 6.8V V H = 6V V = 2V VLL 1/fv ts Technical note 1 fH (nom) = 26.8 kHz R1 = 6.8k Ω R2 = 56 k Ω C2 = 1.8 nF fpull-in = fH (nom) V3 − V1 / R2 V1 / R1 = fH (nom) If Io (A) where: V1 = 3.5V and V3 - V1 is the control voltage range. The voltage at Pin 3 is limited by two clamping diodes at the voltage V3H and V3L When the PLL1 is synchronized and perfectly tuned, V3 = V1. Remark: The value of C2 influences the horizontal oscillator free running frequency; it doesn’t effect the relative pull-in range. If the horizontal fre- quency is changed by using R1, the pull-in range changes accordingly with the formula (A). Technical note 2 The internal pulse "t5", is generated by the current generator "I5" charging the external capacitor "C5", according with the formula (B): t5 = C5 . V5 I5 (B), t5 = TH 12 is recommended. Technical note 3 K9 = 67.5 degrees/volt represents the slope of the oscillator charging period of the waveform at Pin 2: K9 = 360 x 0.75 4 degree V Technical note 4 The second PLL can recover the storage of hori- zontal output stage maintaining a constant duty cycle till the trailing edge of the output pulse gets the trailing edge of the flyback pulse. From this point on, only the leading edge of the output pulse will be shifted covering a total phase shift of: 0.30T; overcoming this value, it will produce a notch in the output pulse (@ fH = 27kHz). Technical note 5 The voltage reference at Pin 19 can be used to polarize the DC operating point of the vertical booster. This voltage corresponds to the double of the mean value voltage of the vertical sawtooth at Pin 13. Technical note 6 VH − VL ts = VH − VLL 1/fV ts = ( VH − VL) (VH − VLL) 1 fV = K14 fV TDA9102C/T 5/7 |
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