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參數(shù)資料
| 型號(hào)： | LM2453TA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Monolithic Triple 6 nS CRT Driver With Integrated Clamp and G1 Blanking |
| 中文描述： | 3 CHANNEL, AUDIO/VIDEO AMPLIFIER, PZFM15 |
| 封裝： | PLASTIC, TO-220, 15 PIN |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 823K |
| 代理商： | LM2453TA |
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Application Hints
(Continued)
PC Board Layout Considerations
For optimum performance, an adequate ground plane, isola-
tion between channels, good supply bypassing and minimiz-
ing unwanted feedback are necessary.Also, the length of the
signal traces from the preamplifier to the LM2453 and from
the LM2453 to the CRT cathode should be as short as pos-
sible.
Due to the high gain and bandwidth of the LM2453, 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.
IMPORTANT LAYOUT CONSIDERATIONS
The NSC reference design can be used directly or it can be
used as a guide for future layouts. Note the location of the
following components:
C48—V
CC
bypass capacitor, located very close to pin 7
and the device ground.
C8—V
BB
bypass capacitor, located close to pin 8 and
ground.
C34,C35, C46—V
bypass capacitors, near LM2453
V
clamp diodes. Very important for arc protection. Note
the direct path from the capacitor ground to the LM2453
ground.
C25-27—clamp output bypass caps. Very important for a
stable DC clamp voltage and for protecting the clamp out-
puts from damage due to a CRT arc.
The routing of the LM2453 video outputs to the CRT is very
critical to achieving optimum performance. Figure 20 shows
the routing and component placement from pin 1 of the
LM2453 to the blue cathode. Note that the components are
placed so that they almost line up from the output pin of the
LM2453 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 D16, D17, R17 and
D7 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
protection diodes. The anode of protection diode D17 is con-
nected directly to a section of the ground plane that has a
short and direct path to the LM2453 ground pins. The cath-
ode of D16 is connected to V
very close to decoupling ca-
pacitor C34, which is connected to the same section of the
ground plane as D17. The diode placement and routing is
very important for minimizing the voltage stress on the
LM2453 video outputs during an arc over event. Lastly, no-
tice that S1 is placed very close to the blue cathode and is
tied directly to the ground under the CRT connector.
L
www.national.com
9
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