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PDF LM2413T Data sheet ( Hoja de datos )

Número de pieza LM2413T
Descripción Monolithic Triple 4 ns CRT Driver
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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December 1999
LM2413
Monolithic Triple 4 ns CRT Driver
General Description
The LM2413 is an integrated high voltage CRT driver circuit
designed for use in high-resolution color monitor applica-
tions. The IC contains three high input impedance, wide
band amplifiers, which directly drive the RGB cathodes of a
CRT. Each channel has its gain internally set to −14 and can
drive CRT capacitive loads as well as resistive loads present
in other applications, limited only by the package’s power
dissipation.
The IC is packaged in an industry standard 11 lead TO-220
molded plastic power package. See Thermal Considerations
on page 6.
Features
n Rise/Fall times typically 3.7/4.4 with 8 pF load at 40 VPP
n Well matched with LM1282/3 video preamps
n 1V to 5V input range
n Stable with 0–20 pF capacitive loads and inductive
peaking networks
n Convenient TO-220 staggered lead package style
n Standard LM240X Family Pinout which is designed for
easy PCB layout
Applications
n 1600 x 1200 Displays up to 70 Hz Refresh
n Pixel clock frequencies up to 180 MHz
n Monitors using video blanking
Schematic and Connection Diagrams
DS101275-1
FIGURE 1. Simplified Schematic Diagram (One
Channel)
DS101275-2
Top View
Order Number LM2413T
See NS Package Number TA11C
© 1999 National Semiconductor Corporation DS101275
www.national.com

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LM2413T pdf
Application Hints (Continued)
DS101275-10
FIGURE 9. One Channel of the LM2413 with the Recommended Arc Protection Circuit
OPTIMIZING TRANSIENT RESPONSE
Referring to Figure 9, there are three components (R1, R2
and L1) that can be adjusted to optimize the transient re-
sponse of the application circuit. Increasing the values of R1
and R2 will slow the circuit down while decreasing over-
shoot. Increasing the value of L1 will speed up the circuit as
well as increase overshoot. It is very important to use induc-
tors with very high self-resonant frequencies, preferably
above 300 MHz. The values shown in Figure 9 can be used
as a good starting point for the evaluation of the LM2413.
Effect of Load Capacitance
The output rise and fall times as well as overshoot will vary
as the load capacitance varies. The values of the output cir-
cuit (R1, R2 and L1 in Figure 9) should be chosen based on
the nominal load capacitance. Once this is done the perfor-
mance of the design can be checked by varying the load
based on what the expected variation will be during produc-
tion.
Effect of Offset
Figure 5 shows the variation in rise and fall times when the
output offset of the device is varied from 35 to 55 VDC. The
rise and fall times show about the same overall variation.
The slightly faster rise and fall times are fastest near the cen-
ter point of 45V, making this the optimum operating point. At
the low and high output offset range, the characteristic of
rise/fall time is slower due to the saturation of Q3 and Q4.
The recovery time of the output transistors takes longer com-
ing out of saturation thus slows down the rise and fall times.
THERMAL CONSIDERATIONS
Figure 4 shows the performance of the LM2413 in the test
circuit shown in Figure 2 as a function of case temperature.
Figure 4 shows that both the rise and fall times of the
LM2413 become slightly longer as the case temperature in-
creases from 40˚C to 100˚C. Please note that the LM2413 is
never to be operated over a case temperature of 100˚C.
In addition to exceeding the safe operating temperature, the
rise and fall times will typically exceed 3.7/4.4 ns.
Figure 6 shows that total power dissipation of the LM2413
vs. Frequency when all three channels of the device are driv-
ing an 8 pF load. Typically the active time is about 72% of the
total time for one frame. Worst-case power dissipation is
when a one on, one off pixel is displayed over the active time
of the video input. This is the condition used to measure the
total power dissipation of the LM2413 at different input fre-
quencies. Figure 6 gives all the information a monitor de-
signed normally needs for worst case power dissipation.
However, if the designer wants to calculate the power dissi-
pation for an active time different from 72%, this can be done
using the information in Figure 14. The recommended input
black level voltage is 1.9V. From Figure 14, if a 1.9V input is
used for the black level, then power dissipation during the in-
active video time is 1.95W. This includes both the 80V and
12V supplies.
If the monitor designer chooses to calculate the power dissi-
pation for the LM2413 using an active video time different
from 72%, then he needs to use the following steps when us-
ing a 1.9V input black level:
1. Multiply the black level power dissipation, 1.95W, by
0.28, the result is 0.6W.
2. Choose the maximum frequency to be used. A typical
application would use 90 MHz, or a 180 MHz pixel clock.
The power dissipation is 12.4W.
3. Subtract the 0.6W from the power dissipation from Fig-
ure 6. For 100 MHz this would be 12.4 − 0.6 = 11.8W.
4. Divide the result from step 3 by 0.72. For 90 MHz, the re-
sult is 16.4W
5. Multiply the result in 4 by the new active time percent-
age.
6. Multiply 1.95W by the new inactive time.
7. Add together the results of steps 5 and 6. This is the ex-
pected power dissipation for the LM2413 in the design-
er’s application.
The LM2413 case temperature must be maintained below
100˚C. If the maximum expected ambient temperature is
70˚C and the maximum power dissipation is 12.2W (Figure
6) then a maximum heat sink thermal resistance can be cal-
culated:
DS101275-11
This example assumes a capacitive load of 8 pF and no re-
sistive load.
TYPICAL APPLICATION
A typical application of the LM2413 is shown in Figure 10.
Used in conjunction with an LM1283, a complete video chan-
nel from monitor input to CRT cathode can be achieved. Per-
formance is excellent for resolutions up to 1600 x 1200 and
pixel clock frequencies at 180 MHz. Figure 10 is the sche-
matic for the NSC demonstration board that can be used to
evaluate the LM1283/2413 combination in a monitor.
5 www.national.com

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LM2413T arduino
Physical Dimensions inches (millimeters) unless otherwise noted
NS Package Number TA11B
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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