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TDA4865J データシート(PDF) 4 Page - NXP Semiconductors |
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TDA4865J データシート(HTML) 4 Page - NXP Semiconductors |
4 / 18 page TDA4865J_TDA4865AJ_2 © NXP B.V. 2006. All rights reserved. Product data sheet Rev. 02 — 3 November 2006 4 of 18 NXP Semiconductors TDA4865J; TDA4865AJ Vertical deflection booster 6.2 Pin description 7. Functional description Both the TDA4865J and TDA4865AJ consist of a differential input stage, a vertical output stage, a flyback generator, a reference circuit and a thermal protection circuit. The TDA4865J operates with a separate flyback supply voltage (see Figure 1) while the TDA4865AJ generates the flyback voltage internally by doubling the supply voltage (see Figure 2). 7.1 Differential input stage The differential sawtooth input current signal (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. 7.2 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 of Tj > 150 °C the protection will be activated and will reduce the deflection current (IVOUT). 7.3 Flyback generator The flyback generator supplies the vertical output stage during flyback. The TDA4865J is used with a separate flyback supply voltage to achieve a short flyback time with minimized power dissipation. The TDA4865AJ needs a capacitor (CF) connected between pins VP3 and VP2 (see Figure 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 TDA4865AJ the resistor R6 in the positive supply line can be used to reduce the power consumption. Table 3. Pin description Symbol Pin Description TDA4865J TDA4865AJ VP1 1 1 positive supply voltage 1 VFB 2 - flyback supply voltage VP3 - 2 flyback generator output VP2 3 3 supply voltage 2 for vertical output GND 4 4 ground or negative supply voltage VOUT 5 5 vertical output INN 6 6 inverted input of differential input stage INP 7 7 non-inverted input of differential input stage |
同様の部品番号 - TDA4865J |
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同様の説明 - TDA4865J |
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