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TDA4864J Arkusz danych(PDF) 6 Page - NXP Semiconductors |
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TDA4864J Arkusz danych(HTML) 6 Page - NXP Semiconductors |
6 / 16 page 2003 Oct 31 6 Philips Semiconductors Product specification Vertical deflection booster TDA4864J; TDA4864AJ FUNCTIONAL DESCRIPTION Both the TDA4864J and TDA4864AJ consist of a differential input stage, a vertical output stage, a flyback generator, a reference circuit and a thermal protection circuit. The TDA4864J operates with a separate flyback supply voltage (see Fig.1) while the TDA4864AJ generates the flyback voltage internally by doubling the supply voltage (see Fig.2). Differential input stage The differential sawtooth input current signal (coming from the deflection controller) is connected to the inputs (inverted signal to pin INN and non-inverted signal to pin INP). The vertical feedback signal is superimposed on the inverted signal on pin INN. Vertical output and thermal protection The vertical output stage is a quasi-complementary class-B amplifier with a high linearity. The output stage is protected against thermal overshoots. For a junction temperature Tj > 150 °C this protection will be activated and will reduce then the deflection current (IV-OUT). Flyback generator The flyback generator supplies the vertical output stage during flyback. The TDA4864J is used with separate flyback supply voltage to achieve a short flyback time with minimized power dissipation. The TDA4864AJ needs a capacitor CF between pins VP3 and VP2 (see Fig.2). Capacitor CF is charged during scan, using the external diode D1 and resistor R5. During flyback the cathode of capacitor CF is connected to the positive supply voltage and the flyback voltage is then twice the supply voltage. For the TDA4864AJ the resistor R6 in the positive supply line can be used to reduce the power consumption. In parallel with the deflection coil a damping resistor RP and an RC combination (RS1 = 5.6 Ω and CS1 = 100 nF) are needed. Furthermore, another additional RC combination (RS2 = 5.6 Ω and CS2 = 47 to 150 nF) can be used to minimize the noise effect and the flyback time (see Figs 9 and 10). |
Podobny numer części - TDA4864J |
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Podobny opis - TDA4864J |
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