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LM2479 データシート(PDF) 3 Page - National Semiconductor (TI) |
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LM2479 データシート(HTML) 3 Page - National Semiconductor (TI) |
3 / 4 page Typical Performance Characteristics (V CC = +120V), Test Circuit - Figure 3 unless otherwise specified. THEORY OF OPERATION The circuit diagram of the LM2479 is shown in Figure 1. The DC clamp circuit amplifies the input signal by -18 and the gain is set by the resistor ratio of 18R and R. The output requires pull-up resistor to 120V. Figure 2 shows the test circuit used for evaluation of the LM2479 Clamp Amplifier. A high impedance voltmeter (100M Ω) is used for DC measure- ments at the output. The DC transfer function is shown in Figure 4. APPLICATION HINTS Power Supply Bypass The LM2479 should have proper power supply bypassing for optimum performance. A 0.1µF capacitor should be con- nected from the supply pin, V cc, to ground, as close to the supply and ground pins as is practical. Additionally, a 1.0µF electrolycelectrolytictic capacitor should be connected from the supply pin to ground. The electrolytic capacitor should also be placed reasonably close to the LM2479’s supply and ground pins. Application Circuit The application circuit shown in Figure 5 is designed to help clamp the voltage at the output of the driver to the desired level. Capacitor C 4 stabilizes the entire node at the anode of the clamp diode, D 3, by creating a low impedance at high frequencies. Figure 5 also shows the standard application circuit topology when used with an LM246X CRT driver. It shows all the components necessary to optimize perfor- mance as well as to protect against damage from a CRT arc event. No additional components are required to protect the LM2479 from arc damage. Demonstration Hardware National Semiconductor has designed a demonstration neckboard for the LM126X, LM246X, and the LM2479 chipset. To obtain demonstration boards contact the National Semiconductor Sales Office in your region. DS101391-4 FIGURE 4. V out vs Vin DS101391-7 FIGURE 5. One Channel of the LM2479 and LM246X Application Circuit www.national.com 3 |
同様の部品番号 - LM2479 |
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同様の説明 - LM2479 |
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