数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

LM2403 数据表(PDF) 7 Page - Texas Instruments

部件名 LM2403
功能描述  Monolithic Triple 4.5 nS CRT Driver
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2403 数据表(HTML) 7 Page - Texas Instruments

Back Button LM2403 Datasheet HTML 3Page - Texas Instruments LM2403 Datasheet HTML 4Page - Texas Instruments LM2403 Datasheet HTML 5Page - Texas Instruments LM2403 Datasheet HTML 6Page - Texas Instruments LM2403 Datasheet HTML 7Page - Texas Instruments LM2403 Datasheet HTML 8Page - Texas Instruments LM2403 Datasheet HTML 9Page - Texas Instruments LM2403 Datasheet HTML 10Page - Texas Instruments LM2403 Datasheet HTML 11Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 15 page
background image
OBSOLETE
LM2403
www.ti.com
SNOS019B – AUGUST 1999 – REVISED APRIL 2013
OPTIMIZING TRANSIENT RESPONSE
Referring to Figure 11, there are three components (R1, R2 and L1) that can be adjusted to optimize the
transient response of the application circuit. Increasing the values of R1 and R2 will slow the circuit down while
decreasing overshoot. Increasing the value of L1 will speed up the circuit as well as increase overshoot. It is very
important to use inductors with very high self-resonant frequencies, preferably above 300 MHz. Ferrite core
inductors from J.W. Miller Magnetics (part # 78FR12M) were used for optimizing the performance of the device in
the TI application board. The values shown in Figure 11 can be used as a good starting point for the evaluation
of the LM2403. The TI demo board also has a position open to add a resistor in parallel with L1. This resistor can
be used to help control overshoot. Using variable resistors for R1 and the parallel resistor is a great way to help
dial in the values needed for optimum performance in a given application.
Pull-up Resistors
Optimizing the performance of the LM2403 does require the use of pull-up resistors at the outputs of the CRT
driver. These resistors are shown as R100, R101, and R102 in the schematic. If you have a demo board form TI
please note that these resistors have been added on the back of the board since there is no PCB location for the
pull-up resistors. Because of the improved performance with these resistors, all demo boards have been shipped
with the added pull-up resistors. The LM2403 does have some crossover distortion, normal for any AB amplifier
such as the LM2403. Adding the pull-up resistors does add more bias to Q3 (Figure 2) thus minimizing the
crossover distortion. The LM2403 is normally used in high end monitors, so it is highly recommended that the
12k pull-up resistors be used in any design using the LM2403. Selecting a 12k resistor provides the needed pull-
up current and limits the worst case power dissipation to 1/4W (white level at 25V).
In some applications pull-down resistors may be preferred. Using 12k resistors gives acceptable performance,
but this will require the use of 1/2W resistors. Normally the power save mode establishes whether pull-up or pull-
down resistors are preferred. If the setup of the power save mode in the monitor gives a low output at the
LM2403, then the pull-down resistors would be preferred, if the 80V supply is still turned on.
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 circuit (R1, R2 and L1 in Figure 11) should be chosen based on the nominal load capacitance. Once this
is done the performance of the design can be checked by varying the load based on what the expected variation
will be.
For example, suppose you needed to drive a 10 pF (±20%) load with a 40Vp-p waveform. First, you would pick
the values of R1, R2 and L1 that give the desired response with a 10 pF load. Then you would test the design
when driving an 8 pF load and a 12 pF load. The table below summarizes the results from doing this exercise in
a test board in the TI lab. The output signal swing was 40Vp-p from 65V to 25V.
Parameter
8 pF
10 pF
12 pF
Rise Time
4.1
4.2
4.3
Overshoot
1%
5%
10%
Fall Time
4.4
4.6
4.7
Overshoot
1%
2%
5%
The example above clearly demonstrates the importance of having a good estimate of the range of the load
capacitance.
Effect of Offset
Figure 8 shows the variation in rise and fall times when the output offset of the device is varied from 30 VDC to 50
VDC. The rise time shows about twice as much variation as the fall time, however the maximum variation relative
to the center data point (40 VDC) is less than 10%.
Copyright © 1999–2013, Texas Instruments Incorporated
Submit Documentation Feedback
7
Product Folder Links: LM2403


类似零件编号 - LM2403

制造商部件名数据表功能描述
logo
National Semiconductor ...
LM2403 NSC-LM2403 Datasheet
709Kb / 11P
   Monolithic Triple 4.5 nS CRT Driver
LM2403T NSC-LM2403T Datasheet
709Kb / 11P
   Monolithic Triple 4.5 nS CRT Driver
More results

类似说明 - LM2403

制造商部件名数据表功能描述
logo
National Semiconductor ...
LM2408 NSC-LM2408 Datasheet
154Kb / 8P
   Monolithic Triple 4.5 ns CRT Driver
LM2403 NSC-LM2403 Datasheet
709Kb / 11P
   Monolithic Triple 4.5 nS CRT Driver
LM2470 NSC-LM2470 Datasheet
841Kb / 14P
   Monolithic Triple 7.0 ns CRT Driver
LM2405 NSC-LM2405 Datasheet
191Kb / 7P
   Monolithic Triple 7 ns CRT Driver
LM2415 NSC-LM2415 Datasheet
459Kb / 10P
   Monolithic Triple 5.5 ns CRT Driver
LM2439 NSC-LM2439 Datasheet
527Kb / 9P
   Monolithic Triple 9.5 ns CRT Driver
LM2402 NSC-LM2402 Datasheet
816Kb / 11P
   Monolithic Triple 3 ns CRT Driver
LM2412 NSC-LM2412 Datasheet
815Kb / 11P
   Monolithic Triple 2.8 ns CRT Driver
logo
Texas Instruments
LM2445 TI1-LM2445 Datasheet
1Mb / 15P
[Old version datasheet]   Monolithic Triple 7.5 ns CRT Driver
logo
National Semiconductor ...
LM2412A NSC-LM2412A Datasheet
818Kb / 11P
   Monolithic Triple 2.8 ns CRT Driver
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com