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LM2479 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2479
Descripción Electrónicos  120V Triple Bias Clamp
Download  4 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2479 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Typical Performance Characteristics
(V
CC = +120V), Test Circuit - Figure 3 unless otherwise specified.
THEORY OF OPERATION
The circuit diagram of the LM2479 is shown in Figure 1. The
DC clamp circuit amplifies the input signal by -18 and the
gain is set by the resistor ratio of 18R and R. The output
requires pull-up resistor to 120V. Figure 2 shows the test
circuit used for evaluation of the LM2479 Clamp Amplifier. A
high impedance voltmeter (100M
Ω) is used for DC measure-
ments at the output. The DC transfer function is shown in
Figure 4.
APPLICATION HINTS
Power Supply Bypass
The LM2479 should have proper power supply bypassing for
optimum performance. A 0.1µF capacitor should be con-
nected from the supply pin, V
cc, to ground, as close to the
supply and ground pins as is practical. Additionally, a 1.0µF
electrolycelectrolytictic capacitor should be connected from
the supply pin to ground. The electrolytic capacitor should
also be placed reasonably close to the LM2479’s supply and
ground pins.
Application Circuit
The application circuit shown in Figure 5 is designed to help
clamp the voltage at the output of the driver to the desired
level. Capacitor C
4 stabilizes the entire node at the anode of
the clamp diode, D
3, by creating a low impedance at high
frequencies. Figure 5 also shows the standard application
circuit topology when used with an LM246X CRT driver. It
shows all the components necessary to optimize perfor-
mance as well as to protect against damage from a CRT arc
event. No additional components are required to protect the
LM2479 from arc damage.
Demonstration Hardware
National Semiconductor has designed a demonstration
neckboard for the LM126X, LM246X, and the LM2479
chipset. To obtain demonstration boards contact the National
Semiconductor Sales Office in your region.
DS101391-4
FIGURE 4. V
out vs Vin
DS101391-7
FIGURE 5. One Channel of the LM2479 and LM246X
Application Circuit
www.national.com
3


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