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LM24 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM24 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 7 page AC Test Circuit (Continued) Theory of Operation The LM2405 is a high voltage monolithic triple CRT driver suitable for SVGA and XGA display applications. The LM2405 features +80V operation and low power dissipation. The part is housed in the industry standard 11-lead TO-220 molded plastic power package. The circuit diagram of the LM2405 is shown in Figure 1.A PNP emitter follower, Q5, provides input buffering. Q1 and Q2 form a fixed gain cascode amplifier, with a gain of −14. Emitter followers Q3 and Q4 isolate the high output imped- ance of the amplifier from the capacitance of the CRT cath- ode, and make the circuit relative insensitive to load capaci- tance. Q6 provides biasing to the output emitter follower stage to reduce crossover distortion at low signal levels. Figure 2 shows a typical test circuit for evaluation of the LM2405. This circuit is designed to allow testing of the LM2405 in a 50 Ω environment, such as a pulse generator and a scope, or a network analyzer. In this test circuit, two low inductance resistors in series totaling 4.95 k Ω form a 100:1 wideband low capacitance probe when connected to a 50 Ω cable and load. The input signal from the generator is AC coupled to the base of Q5. Application Hints INTRODUCTION National Semiconductor is committed to providing applica- tion information that assists our customers in obtaining the best performance possible from our products. The following information is provided in order to support this commitment. The reader should be aware that the optimization of perfor- mance was done using a specific printed circuit board de- signed at National. Variations in performance can be realized due to physical changes in the printed circuit board and the application. Therefore, the designer should be aware that component value changes may be required in order to opti- mize performance in a given application. The values shown in this document can be used as a starting point for evalua- tion purposes. When working with high bandwidth circuits, good layout practices are also critical to achieving maximum performance. POWER SUPPLY BYPASS Since the LM2405 is a wide bandwidth amplifier, proper power supply bypassing is critical for optimum performance. Improper power supply bypassing can result in large over- shoot, ringing and oscillation. A 0.01 µF capacitor should be connected from the supply pin, V CC, to ground, as close to DS012682-4 FIGURE 3. V OUT vs VIN DS012682-5 FIGURE 4. Power Dissipation vs V CC DS012682-6 FIGURE 5. Large Signal Frequency Response DS012682-7 FIGURE 6. Pulse Response www.national.com 3 |
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