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參數(shù)資料
| 型號： | LM2471TA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Monolithic Triple 4 ns High Swing CRT Driver |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PZFM11 |
| 封裝： | PLASTIC, TO-220, 11 PIN |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 663K |
| 代理商： | LM2471TA |
Application Hints
(Continued)
NSC DEMONSTRATION BOARD
Figure 11
is the schematic for the NSC LM126X_246X 11L
demonstration board that can be used to evaluate the
LM126X and LM2471 combination in a monitor.
Figure 12
shows the routing and component placement on the NSC
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
bypass capacitor, located very close to pin 6
and ground pins
C20—V
bypass capacitors, located close to pin 10
and ground
C46, C47, C48—V
bypass capacitors, near LM2471
and V
CC
clamp diodes. Very important for arc protection.
The routing of the LM2471 outputs to the CRT is very critical
to achieving optimum performance.
Figure 13
shows the
routing and component placement from pin 3 of the LM2471
to the red cathode. Note that the components are placed so
that they almost line up from the output pin of the LM2471 to
the red cathode pin of the CRT connector. This is done to
minimize the length of the video path between these two
components. Note also that D1, D2, R23 and D5 are placed
to minimize the size of the video nodes that they are at-
tached to. This minimizes parasitic capacitance in the video
path and also enhances the effectiveness of the protection
diodes. The anode of protection diode D1 is connected
directly to a section of the the ground plane that has a short
and direct path to the LM2471 ground pins. The cathode of
D2 is connected to V
CC
very close to decoupling capacitor
C46 (see
Figure 13
) which is connected to the same section
of the ground plane as D1. The diode placement and routing
is very important for minimizing the voltage stress on the
LM2471 during an arcover event. Lastly, notice that S1 is
placed very close to the red cathode and is tied directly to
CRT ground.
L
www.national.com
7
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