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LM2406 Folha de dados(PDF) 3 Page - National Semiconductor (TI) |
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LM2406 Folha de dados(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page TLH12327 – 4 FIGURE 3 VOUT vs VIN TLH12327 – 5 FIGURE 4 Power Dissipation vs VCC TLH12327 – 6 FIGURE 5 Large Signal Frequency Response TLH12327 – 7 FIGURE 6 Pulse Response Theory of Operation The LM2406 is a high voltage monolithic triple CRT driver suitable for VGA and SVGA display applications The LM2406 features a80V operation and low power dissipa- tion The part is housed in the industry standard 11-lead TO-220 molded plastic power package The circuit diagram of the LM2406 is shown in Figure 1 Q1 and R2 provide a conversion of input voltage to current while Q2 acts as a common base or cascode amplifier stage to drive the load resistor R1 Emitter followers Q3 and Q4 isolate the impedance of R1 from the capacitance of the CRT cathode and make the circuit relative insensitive to load capacitance The gain of this circuit is bR1(R2 llR3) and is fixed at b145 The bandwidth of the circuit is set by the collector time constant formed by the resistor R1 and associated capacitance of Q2 Q3 Q4 and stray layout ca- pacitance Transistor Q6 and resistors R7 and R8 provide biasing to the output emitter-follower stage to reduce cross- over distortion at low signal levels while R3 provides a DC bias offset to match the output level characteristics of the preamplifier stage Figure 2 shows a typical test circuit for evaluation of the LM2406 This circuit is designed to allow testing of the LM2406 in a 50X environment such as a pulse generator and a scope or a network analyzer In this test circuit two resistors in series totaling 495 kX form a 1001 wideband low capacitance probe when connected to a 50X cable and load The input signal from the generator is AC coupled to the base of Q5 while a DC bias of a12V is applied to the base of Q2 (See Figure 2 ) 3 |
Nº de peça semelhante - LM2406 |
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Descrição semelhante - LM2406 |
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