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LM2406 Fiches technique(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM2406
Description  Monolithic Triple 9 ns CRT Driver
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2406 Fiches technique(HTML) 3 Page - National Semiconductor (TI)

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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


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