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LM2439T DATASHEET PDF

LMT LM – Monolithic Triple NS CRT Driver, Package: to , Pin Nb=9. The is an integrated high voltage CRT driver circuit designed for use in. Download National Semiconductor Corporation LMT pdf datasheet file. LMT Datasheet PDF Download – Monolithic Triple ns CRT Driver, LMT data sheet.

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Schematic and Connection Diagrams. Figure 7 shows the variation in rise and fall times when the. Ferrite core inductors from J. Note that the components ml2439t placed so. The anode of protection diode D14 is con. Note also that D14, D15, R29 and D13 are.

Figure 6 shows the maximum power dissipation of the. Figure 6 shows the maximum power dissipation of the LM vs Frequency when all three channels of the device are driving an 8 pF load with a 40 V p-p alternating one pixel on, one pixel off signal. Tab is at GND.

Per- formance is ideal for x resolution displays with pixel clock frequencies up to 75 MHz.

The following references are recommended: Using datashest able resistors for R1 and the parallel resistor will simplify finding the values needed for optimum performance in a given application.

Very important for arc protection. Referring to Figure 9there are three components R1, R2. The datashfet ues shown in Figure 9 can be used as a good starting point for the evaluation of the LM V CC clamp diodes.

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Increasing the values of R1.

Note also that D14, D15, R29 and D13 are placed to minimize the size of the video nodes that they are attached to. See Thermal Considerations section. Once the optimum values are determined. Once the optimum values are determined the variable resistors can be replaced with fixed values. LM vs Frequency when all three channels of the device. This resistor can be used to help control overshoot. The IC is packaged in an industry standard 9-lead TO molded plastic power package.

Increasing the values of R1 and R2 will slow the circuit down while decreasing over- shoot. The fall time shows a.

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Figure 10 is the sche. It is very important to use induc. This minimizes parasitic capacitance in the. A typical application of the LM is shown in Figure This is done to minimize the length of the video path between these two components.

The rise time shows a maximum variation relative to the cen.

Increasing the value of L1 will speed up the circuit as well dataxheet increase overshoot. The schematic of the board is shown in Figure The designer should note that if the load capacitance. Also, the length of the. For optimum performance, an adequate ground plane, isola.

Monolithic Triple 9.5 Ns CRT Driver [Obsolete]

Figure 8 shows the effect of increased load capacitance on. Figure 12 shows the. Because of its high small signal bandwidth, the part may os- cillate in a monitor if feedback occurs around the video chan- nel through the chassis wiring. This example assumes a capacitive load of 8 pF and no re. This example assumes a capacitive load of 8 pF and no re- sistive load.

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Monolithic Triple 9.5 Ns CRT Driver [Obsolete]

Figure 11 shows routing and component placement on the. To prevent this, leads to the. The designer should note that if the load capacitance is increased the AC component of the total power dissipation will also increase.

Note that the components are placed so that they almost line up from the output pin of the LM to the blue cathode pin of the CRT connector. The NSC demo board also has a position open to add a resistor in parallel with L1. The NSC demo board also. This is done to. This graph gives the designer the information needed to determine the heat sink requirement for the appli- cation.

This board provides a good example of a layout that can be used as a guide for future layouts. Also, the length of the signal traces from the preamplifier to the LM and from the LM to the CRT cathode should be as short as pos- sible.

It is very important to use induc- tors with very high self-resonant frequencies, preferably above MHz. This demonstrates the importance of knowing the load capacitance in the dafasheet.