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參數(shù)資料
| 型號： | LM2459TE |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Monolithic Single Channel 15 MHz DTV CRT Driver |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PZFM7 |
| 封裝： | PLASTIC, TO-220, 7 PIN |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 578K |
| 代理商： | LM2459TE |
Typical Performance Characteristics
(V
CC
= +180V
DC
, V
BB
= +8V
DC
, C
L
= 10pF, V
OUT
= 130V
PP
(35V 165V), Test Circuit -
Figure 3
, Pin 6 floating, unless otherwise specified) (Continued)
TABLE 1. Power Dissipation for Various Video Patterns
Power Dissipation (W)
Pattern
Format
480i
0.5
1.2
0.9
1.0
0.8
0.9
0.8
1.0
0.7
1.1
1.4
1.5
0.9
0.9
1.4
1.3
1.3
1.5
1.8
2.8
480p
0.5
1.2
0.9
1.0
0.8
0.9
0.8
1.1
0.7
1.2
1.9
2.2
1.2
1.2
1.7
1.7
1.8
2.2
2.8
3.8
Raster
Full White Field
White Box, 75% Screen Size
Gray Bars
Color Bars 75% Amplitude
Color Bars 100% Amplitude
SMPTE Color Bars
SMPTE 133
Cross Hatch 16x12
Resolution Chart
Multiburst
White Text on Black Background
Windows Pattern
Windows Pattern
Windows Pattern
Vertical Lines 5 On 5 Off
Vertical Lines 4 On 4 Off
Vertical Lines 3 On 3 Off
Vertical Lines 2 On 2 Off
Vertical Lines 1 On 1 Off
Note:
Input from signal generator: t
r
, t
f
<
2 ns.
Theory of Operation
The LM2459 is a high voltage monolithic single channel CRT
driver suitable for HDTV applications. The LM2459 operates
with 180V and 8V power supplies. The part is housed in a
staggered 7-lead TO-220 molded plastic power package.
The circuit diagram of the LM2459 is shown in
Figure 2
. The
PNP emitter follower, Q5, provides input buffering. Q1 and
Q2 form a fixed gain cascode amplifier with resistors R1 and
R2 setting the gain at 51. Emitter followers Q3 and Q4
isolate the high output impedance of the cascode stage from
the capacitance of the CRT cathode which decreases the
sensitivity of the device to load capacitance. Q6 provides
biasing to the output emitter follower stage to reduce cross-
over distortion at low signal levels.
Figure 3
shows a typical test circuit for evaluation of the
LM2459. This circuit is designed to allow testing of the
LM2459 in a 50
environment without the use of an expen-
sive FET probe. In this test circuit, the two 4.99k
resistors
form a 400:1 wideband, low capacitance probe when con-
nected to a 50
coaxial cable and a 50
load (such as a
50
oscilloscope input). The input signal from the generator
is ac coupled to the base of Q5.
Application Hints
INTRODUCTION
National Semiconductor (NSC) is committed to provide ap-
plication information that assists our customers in obtaining
the best performance possible from our products. The fol-
lowing information is provided in order to support this com-
mitment. The reader should be aware that the optimization of
performance was done using a specific printed circuit board
designed at NSC. Variations in performance can be realized
due to physical changes in the printed circuit board and the
application. Therefore, the designer should know that com-
ponent value changes may be required in order to optimize
performance in a given application. The values shown in this
document can be used as a starting point for evaluation
purposes. When working with high bandwidth circuits, good
layout practices are also critical to achieving maximum per-
formance.
IMPORTANT INFORMATION
The LM2459 performance is targeted for the HDTV market.
The application circuits shown in this document to optimize
performance and to protect against damage from CRT ar-
cover are designed specifically for the LM2459. If another
member of the LM245X family is used, please refer to its
datasheet.
POWER SUPPLY BYPASS
Since the LM2459 is a wide bandwidth amplifier, proper
power supply bypassing is critical for optimum performance.
Improper power supply bypassing can result in large over-
shoot, ringing or oscillation. 0.1μF capacitors should be con-
nected from the supply pins, V
CC
and V
BB
, to ground, as
close to the LM2459 as is practical. Additionally, a 22μF or
larger electrolytic capacitor should be connected from both
supply pins to ground reasonably close to the LM2459.
L
www.national.com
6
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