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參數(shù)資料
| 型號： | LM2426TA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZFM11 |
| 封裝： | PLASTIC, TO-220, 11 PIN |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 804K |
| 代理商： | LM2426TA |
Application Hints (Continued)
for optimum performance in a given application. Once the
optimum value is determined, the variable resistor can be
replaced with a fixed value.
Figure 12 shows the typical cathode pulse response with an
output swing of 110V
PP using a LM1269 preamplifier.
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 LM2426 and
from the LM2426 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,
Robert A.,
“Troubleshooting Analog
Circuits”,
Butterworth-Heinemann, 1991.
Because of its high small signal bandwidth, the part may
oscillate in a TV 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.
TYPICAL APPLICATION
A typical application of the LM2426 is shown in the sche-
matic for the NSC demonstration board in Figure 14 and
Figure 15. Used in conjunction with an LM126X preamplifier,
a complete video channel from input to CRT cathode can be
achieved. Performance is ideal for HDTV applications. The
NSC demonstration board can be used to evaluate the
LM126X/2426 combination in a TV.
NSC DEMONSTRATION BOARD
Figure 16 shows the routing and component placement on
the NSC LM126X/2426 demonstration board. 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
components:
C19—V
CC bypass capacitor, located very close to pin 2
and ground pins
C20—V
BB bypass capacitor, located close to pin 11 and
ground
C46, C48 — V
CC bypass capacitors, near LM2426 and
V
CC clamp diodes. Very important for arc protection.
The routing of the LM2426 outputs to the CRT is very critical
to achieving optimum performance. Figure 17 shows the
routing and component placement from pin 10 (V1
OUT)of
the LM2426 to the blue cathode. Note that the components
are placed so that they almost line up from the output pin of
the LM2426 to the blue cathode pin of the CRT connector.
This is done to minimize the length of the video path be-
tween these two components. Note also that D8, D9, R24
and D6 are placed to minimize the size of the video nodes
that they are attached to. This minimizes parasitic capaci-
tance in the video path and also enhances the effectiveness
of the protection diodes. The anode of protection diode D8 is
connected directly to a section of the the ground plane that
has a short and direct path to the LM2426 ground pins. The
cathode of D9 is connected to V
CC very close to decoupling
capacitor C48 (see Figure 17) which is connected to the
same section of the ground plane as D8. The diode place-
ment and routing is very important for minimizing the voltage
stress on the LM2426 during an arcover event. Lastly, notice
that S3 is placed very close to the blue cathode and is tied
directly to CRT ground.
LM2426
www.national.com
7
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2426TE | 制造商:Rochester Electronics LLC 功能描述:DTV TRIPLE DRIVER, 30 MHZ, 180 - Bulk |
| LM2426TE/NOPB | 功能描述:IC DRIVER DTV 3CH 30MHZ 11-TO220 RoHS:是 類別:集成電路 (IC) >> PMIC - 顯示器驅動器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 顯示器類型: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 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 供應商設備封裝:16-QSOP 包裝:帶卷 (TR) |
| LM2427 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Triple 80 MHz CRT Driver |
| LM2427T | 制造商:Panasonic Industrial Company 功能描述:IC |
| LM2429 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Monolithic Triple Channel 15 MHz DTV Driver |
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