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參數(shù)資料
| 型號(hào)： | LM2436 |
| 廠(chǎng)商： | National Semiconductor Corporation |
| 英文描述： | Monolithic Triple 7.5 ns CRT Driver |
| 中文描述： | 單片三重7.5納秒CRT顯示器驅(qū)動(dòng) |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 558K |
| 代理商： | LM2436 |
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Application Hints
(Continued)
TABLE 1. LM2436 Cathode Response
t
r
/OS
7.7 ns / 7%
7.7 ns / 6%
7.4 ns / 7%
t
f
/OS
7.7 ns / 5%
7.5 ns / 6%
7.3 ns / 7%
Red
Green
Blue
PC BOARD LAYOUT CONSIDERATIONS
For optimum performance, an adequate ground plane, iso-
lation between channels, good supply bypassing and mini-
mizing unwanted feedback are necessary.Also, the length of
the signal traces from the preamplifier to the LM2436 and
from the LM2436 to the CRT cathode should be as short as
possible. The following references are recommended:
Ott, Henry W., “Noise Reduction Techniques in Electronic
Systems”, John Wiley & Sons, New York, 1976.
“Video Amplifier Design for Computer Monitors”, National
Semiconductor Application Note 1013.
Pease,
Butterworth-Heinemann, 1991.
Because of its high small signal bandwidth, the part may
oscillate in a monitor if feedback occurs around the video
channel through the chassis wiring. To prevent this, leads to
the video amplifier input circuit should be shielded, and input
circuit wiring should be spaced as far as possible from output
circuit wiring.
Robert
A.,
“Troubleshooting
Analog
Circuits”,
NSC DEMONSTRATION BOARD
Figure 12
shows the routing and component placement on
the NSC LM1279/2436 demonstration board. The schematic
of the board is shown in
Figure 11
. This board provides a
good example of a layout that can be used as a guide for
future layouts. Note the location of the following compo-
nents:
C55—V
bypass capacitor, located very close to pin 4
and ground pins
C43, C44—V
BB
bypass capacitors, located close to pin 8
and ground
C53–C56—V
bypass capacitors, near LM2436 and
V
CC
clamp diodes. Very important for arc protection.
The routing of the LM2436 outputs to the CRT is very critical
to achieving optimum performance.
Figure 13
shows the
routing and component placement from pin 1 of the LM2436
to the blue cathode. Note that the components are placed so
that they almost line up from the output pin of the LM2436 to
the blue cathode pin of the CRT connector. This is done to
minimize the length of the video path between these two
components. Note also that D14, D15, R29 and D13 are
placed to minimize the size of the video nodes that they are
attached to. This minimizes parasitic capacitance in the
video path and also enhances the effectiveness of the pro-
tection diodes. The anode of protection diode D14 is con-
nected directly to a section of the the ground plane that has
a short and direct path to the LM2436 ground pins. The
cathode of D15 is connected to V
CC
very close to decoupling
capacitor C55 (see
Figure 13
) which is connected to the
same section of the ground plane as D14. The diode place-
ment and routing is very important for minimizing the voltage
stress on the LM2436 during an arcover event. Lastly, notice
that S3 is placed very close to the blue cathode and is tied
directly to CRT ground.
20043521
Red Cathode Response
FIGURE 10.
L
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2436TA | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Monolithic Triple 7.5 ns CRT Driver |
| LM2437 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Monolithic Triple 7.5 ns CRT Driver |
| LM2437NS | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Driver |
| LM2437T | 制造商:OC White Company 功能描述:CRT DRVR 85V 9-Pin(9+Tab) TO-220 |
| LM2437T/NOPB | 功能描述:IC DRIVER MONOLITHIC TO-220-9 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 顯示器驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 顯示器類(lèi)型:真空熒光 (VF) 配置:5 x 7（矩陣） 接口:串行 數(shù)字或字符:- 電流 - 電源:3.5mA 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-QSOP 包裝:帶卷 (TR) |
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