전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

LM2413 데이터시트(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2413
상세설명  Monolithic Triple 4 ns CRT Driver
Download  11 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2413 데이터시트(HTML) 4 Page - National Semiconductor (TI)

  LM2413 Datasheet HTML 1Page - National Semiconductor (TI) LM2413 Datasheet HTML 2Page - National Semiconductor (TI) LM2413 Datasheet HTML 3Page - National Semiconductor (TI) LM2413 Datasheet HTML 4Page - National Semiconductor (TI) LM2413 Datasheet HTML 5Page - National Semiconductor (TI) LM2413 Datasheet HTML 6Page - National Semiconductor (TI) LM2413 Datasheet HTML 7Page - National Semiconductor (TI) LM2413 Datasheet HTML 8Page - National Semiconductor (TI) LM2413 Datasheet HTML 9Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 11 page
background image
Theory of Operation
The LM2413 is a high voltage monolithic three channel CRT
driver suitable for very high resolution display applications,
up to 1600 x 1200 at 70 Hz refresh rate. The LM2413 oper-
ates using 80V and 12V power supplies. The part is housed
in the industry standard 11-lead TO-220 molded plastic
power package.
The simplified circuit diagram of one channel of the LM2413
is shown in
Figure 1. A PNP emitter follower, Q5, provides in-
put buffering. This minimizes the current loading of the video
pre-amp. R9 is used to turn on Q5 when there is no input.
With Q5 turn on, Q1 will be almost completely off, minimizing
the current flow through Q1 and Q2. This will drive the output
stage near the V
CC rail, minimizing the power dissipation
with no inputs. R6 is a pull-up resistor for Q5 and also limits
the current flow through Q5. R3 and R2 are used to set the
current flow through Q1 and Q2. The ratio of R1 to R2 is
used to set the gain of the LM2413. R1, R2, and R3 are all
related when calculating the output voltage of the CRT
driver. R
b limits the current through the base of Q2. Q1 and
Q2 are in a cascode configuration. Q1 is a low voltage and
very fast transistor. Q2 is a higher voltage transistor. The
cascode configuration gives the equivalent of a very fast and
high voltage transistor. The two output transistors, Q3 and
Q4, form a class B amplifier output stage. R4 and R5 are
used to limit the current through the output stage and set the
output impedance of the LM2413. Q6, along with R7 and R8
set the bias current through Q3 and Q4 when there is no
change in the signal level. This bias current minimizes the
crossover distortion of the output stage. With this bias cur-
rent the output stage now becomes a class AB amplifier with
a crossover distortion much lower than a class B amplifier.
Figure 2 shows a typical test circuit for evaluation of the
LM2413. Due to the very wide bandwidth of the LM2413, a
specially designed output circuit is used with the required se-
ries resistor and C
LOAD to emulate the actual application
when evaluating the performance of the LM2413 in a 50
environment without the use of an expensive FET probe.
The combined resistors of 4950
Ω at the output form a 200:1
voltage divider when connected to a 50
Ω load. The input sig-
nal from the generator is ac coupled to the input of the CRT
driver. V
ADJ
input sets the DC operating range of the
LM2413.
Application Hints
INTRODUCTION
National Semiconductor (NSC) is committed to providing ap-
plication information that assists our customers in obtaining
the best performance possible from our products. The follow-
ing information is provided in order to support this commit-
ment. The reader should be aware that the optimization of
performance was done using a specific printed circuit board
designed at NSC. Variations in performance can be realized
due to physical changes in the printed circuit board and the
application. Therefore, the designer should know that com-
ponent value changes may be required in order to optimize
performance in a given application. The values shown in this
document can be used as a starting point for evaluation pur-
poses. When working with high bandwidth circuits, good lay-
out practices are also critical to achieving maximum perfor-
mance.
POWER SUPPY BYPASS
Since the LM2413 is a very high bandwidth amplifier, proper
power supply bypassing is critical for optimum performance.
Improper power supply bypassing can result in large over-
shoot, ringing and oscillation. A 0.1 µF capacitor should be
connected from the supply pin, V
CC, to ground, as close to
the supply and ground pins as is practical. Additionally, a 10
µF to 100 µF electrolytic capacitor should be connected from
the supply pin to ground. The electrolytic capacitor should
also be placed reasonably close to the LM2413’s supply and
ground pins. A 0.1 µF capacitor should be connected from
the bias pin, V
BB, to ground, as close as is practical to the
part.
ARC PROTECTION
During normal CRT operation, internal arcing may occasion-
ally occur. Spark gaps, in the range of 200V, connected from
the CRT cathodes to CRT ground will limit the maximum volt-
age, but to a value that is much higher than allowable on the
LM2413. This fast, high voltage, high-energy pulse can dam-
age the LM2413 output stage. The application circuit shown
in
Figure 9 is designed to help clamp the voltage at the out-
put of the LM2413 to a safe level. The clamp diodes should
have a fast transient response, high peak current rating, low
series impedance and low shunt capacitance. FDH400 or
equivalent diodes are recommended. D1 and D2 should
have short, low impedance connections to V
CC and ground
respectively. The cathode of D1 should be located very close
to a separately decoupled bypass capacitor. The ground
connection of the diode and the decoupling capacitor should
be very close to the LM2413 ground. This will significantly re-
duce the high frequency voltage transients that the LM2413
would be subjected to during an arc-over condition. Resistor
R2 limits the arc-over current that is seen by the diodes while
R1 limits the current into the LM2413 as well as the voltage
stress at the outputs of the device. R2 should be a 1/2W
solid carbon type resistor. R1 can be a 1/4W metal or carbon
film type resistor. Inductor L1 is critical to reduce the inital
high frequency voltage levels that the LM2413 would be sub-
jected to during an arc-over. Having large value resistors for
R1 and R2 would be desirable, but this has the effect of in-
creasing rise and fall times. The inductor will not only help
protect the device but it will also help optimize rise and fall
times as well as minimize EMI. For proper arc protection, it is
important to not omit any of the arc protection components
shown in
Figure 9. The values of L1 and R1 may need to be
adjusted for a particular application. The recommended mini-
mum value for R1 is 110
Ω, with L1 = .12 µH.
www.national.com
4


유사한 부품 번호 - LM2413

제조업체부품명데이터시트상세설명
logo
Seoul Semiconductor
LM241 SEOUL-LM241 Datasheet
376Kb / 14P
   INFRARED LAMP LED
LM241 SEOUL-LM241 Datasheet
360Kb / 13P
   CYAN LAMP LED
LM241 SEOUL-LM241 Datasheet
392Kb / 14P
   RED OVAL LAMP LED
LM241 SEOUL-LM241 Datasheet
392Kb / 14P
   RED OVAL LAMP LED
LM241 SEOUL-LM241 Datasheet
378Kb / 14P
   RED LAMP LED
More results

유사한 설명 - LM2413

제조업체부품명데이터시트상세설명
logo
National Semiconductor ...
LM2463 NSC-LM2463 Datasheet
460Kb / 12P
   Monolithic Triple 4 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
LM2445 NSC-LM2445 Datasheet
758Kb / 14P
   Monolithic Triple 7.5 ns CRT Driver
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
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