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LM24 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM24
Description  Monolithic Triple 7 ns CRT Driver
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM24 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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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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