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LM2427 데이터시트(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2427
상세설명  Triple 80 MHz CRT Driver
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2427 데이터시트(HTML) 3 Page - National Semiconductor (TI)

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Test Circuit
Figure 1 shows a typical test circuit for evaluation of the
LM2427 This circuit is designed to allow testing of the
LM2427 in a 50X environment such as a pulse generator
oscilloscope or network analyzer The 4950X resistor in se-
ries with the output of the LM2427 forms a 1001 voltage
divider when connected to a 50X-input oscilloscope or net-
work analyzer To calibrate pulse generator set to 24 VPP
into 50X
THEORY OF OPERATlON
The LM2427 is a triple channel transimpedance amplifier for
CRT’s suitable for SVGA XGA IBM and Macintosh display
resolution monitors The LM2427 is pin-to-pin compatible
with the LH2426 and CR5527 CRT drivers The device is
packaged in the industry standard 12-lead SIP TO-220
molded plastic power package The heat sink is electrically
isolated and may be grounded for ease of manufacturing
and RFIEMI shielding
Applying an input current to the LM2427 will result in an
output voltage An input current of about g45 mA will pro-
vide a full output swing of g25V A resistor in series with the
input converts the device into a voltage amplifier with a
resistor value of 430X the voltage gain becomes b13
The LM2427 is a two stage amplifier configured in a push-
pull configuration (see schematic on front page) Q2 is bi-
ased by resistors R4 and R5 Q1 gets its bias through a
5700X feedback resistor and the input biasing current The
bases of Q1 and Q2 are capacitively coupled and therefore
Q2 will be actively driven
The emitter resistors of Q1 and Q2 are bypassed with small
capacitors This increases the gain of the stage for high
frequencies and increases the bandwidth of the amplifier
Emitter followers Q3 and Q4 isolate the input stage from the
output capacitance load and minimizes the circuit sensitivity
to load capacitance
The power supply pin is intemally bypassed If low frequen-
cies are present in the power supply line an electrolytic
capacitor is recommended
Application Hints
The LM2427 is designed as a triple power amplifier for deliv-
ering red green and blue video signals to a cathode ray
tube (CRT) It can provide a 50V output swing and energize
a 12 ns pixel at a CRT cathode with 8 pF of capacitance
As with any CRT driver when designing a video amplifier
board with the LM2427 careful attention should be paid at
reducing stray capacitance along the entire video signal
path This is especially important in the path between the
output of the CRT driver and the cathodes because any
additional capacitance load will increase rise and fall times
and will result in reduced picture quality
INPUT NETWORKS
The voltage gain and the response of the amplifiers can be
set by adding an R-C network to the input
A 430X resistor in series with the input will set the voltage
gain to b13 but this will increase the rise and fall times of
the system (see
Figure 2a )
Bypassing the resistor with a capacitor of about 47 pF will
restore the rise and fall times but will result in some over-
shoot
(Figure 2b)
Adding a resistor in series with the 47 pF capacitor will re-
duce the overshoot but also increases the rise and fall
times
(Figure 2c)
The addition of a second capacitor offers a compromise
between the above networks by improving the rise and fall
times at the expense of some overshoot
(Figure 2d)
Suggested values for the resistors and capacitors are
shown however optimum values may differ depending
upon the stray inductances and capacitances present in dif-
ferent board layouts
TLH11967 – 6
FIGURE 2 Influence of Input Networks
on Switching Performance
3


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