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參數(shù)資料
| 型號： | LM2467TA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Monolithic Triple 7.5 ns CRT Driver |
| 中文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZFM9 |
| 封裝： | TO-220, 9 PIN |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LM2467TA |
Application Hints
(Continued)
OPTIMIZING TRANSIENT RESPONSE
Referring to Figure 9 there are three components (R1, R2
and L1) that can be adjusted to optimize the transient re-
sponse of the application circuit. Increasing the values of R1
and R2 will slow the circuit down while decreasing over-
shoot. Increasing the value of L1 will speed up the circuit as
well as increase overshoot. It is very important to use induc-
tors with very high self-resonant frequencies, preferably
above 300 MHz. Ferrite core inductors from J.W. Miller
Magnetics (part
#
78FR--k) were used for optimizing the
performance of the device in the NSC application board. The
values shown in Figure 10 and Figure 11 can be used as a
good starting point for the evaluation of the LM2467. Using
variable resistors for R1 and the parallel resistor will simplify
finding the values needed for optimum performance in a
given application. Once the optimum values are determined
the variable resistors can be replaced with fixed values.
EFFECT OF LOAD CAPACITANCE
Figure 8 shows the effect of increased load capacitance on
the speed of the device. This demonstrates the importance
of knowing the load capacitance in the application.
EFFECT OF OFFSET
Figure 7 shows the variation in rise and fall times when the
output offset of the device is varied from 40 to 50 V
DC
. The
rise time shows a maximum variation relative to the center
data point (45 V
DC
) less than 5%. The fall time shows a
variation of less than 5% relative to the center data point.
THERMAL CONSIDERATIONS
Figure 4 shows the performance of the LM2467 in the test
circuit shown in Figure 2 as a function of case temperature.
The figure shows that the rise time of the LM2467 increases
by approximately 10% as the case temperature increases
from 50C to 100C. This corresponds to a speed degrada-
tion of 2% for every 10C rise in case temperature.There is a
negligible change in fall time vs. temperature in the test
circuit.
Figure 6 shows the maximum power dissipation of the
LM2467 vs. Frequency when all three channels of the device
are driving an 8 pF load with a 40 V
alternating one pixel
on, one pixel off signal. The graph assumes a 72% active
time (device operating at the specified frequency) which is
typical in a monitor application. The other 28% of the time
the device is assumed to be sitting at the black level (65V in
this case). This graph gives the designer the information
needed to determine the heat sink requirement for his appli-
cation. The designer should note that if the load capacitance
is increased the AC component of the total power dissipation
will also increase.
The LM2467 case temperature must be maintained below
100C. If the maximum expected ambient temperature is
70C and the maximum power dissipation is 4.3W (from
Figure 6 50 MHz bandwidth) then a maximum heat sink
thermal resistance can be calculated:
This example assumes a capacitive load of 8 pF and no
resistive load.
TYPICAL APPLICATION
A typical application of the LM2467 is shown in Figure 10
and Figure 11 Used in conjunction with an LM1267, a com-
plete video channel from monitor input to CRT cathode can
be achieved. Performance is ideal for 1024 x 768 resolution
displays with pixel clock frequencies up to 95 MHz. Figure 10
and Figure 11 are the schematic for the NSC demonstration
board that can be used to evaluate the LM1267/2467 com-
bination in a monitor.
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 LM2467 and
from the LM2467 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
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.
Analog
Circuits”,
NSC DEMONSTRATION BOARD
Figure 12 shows the routing and component placement on
the NSC LM1267/2467 demonstration board. The schematic
of the board is shown in Figure 10 and Figure 11 This board
DS200078-10
FIGURE 9. One Channel of the LM2467 with the Recommended Arc Protection Circuit
L
www.national.com
6
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| LM2467TA/NOPB | 功能描述:IC MONOLITHIC TRIPLE TO-220-9 RoHS:是 類別:集成電路 (IC) >> PMIC - 顯示器驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)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(yīng)商設(shè)備封裝:16-QSOP 包裝:帶卷 (TR) |
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| LM2469 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD ROM, 512 Character RAM and 4 DACs |
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