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LM2429 Arkusz danych(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM2429
Szczegółowy opis  Monolithic Triple Channel 15 MHz DTV Driver
Download  12 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2429 Arkusz danych(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics (V
CC = +180VDC,VBB = +8VDC,CL = 8pF, VOUT = 130VPP
(35V − 165V), Test Circuit - Figure 3 unless otherwise specified) (Continued)
TABLE 1. Power Dissipation for Various Video Patterns
Power Dissipation (W)
Pattern
Format
480i
480p
Raster
1.8
1.8
Full White Field
4.0
4.0
White Box, 75% Screen Size
3.1
3.1
Gray Bars
3.2
3.3
Color Bars 75% Amplitude
2.7
2.8
Color Bars 100% Amplitude
3.0
3.0
SMPTE Color Bars
2.7
2.7
SMPTE 133
3.6
3.9
Cross Hatch 16x12
2.3
2.6
Resolution Chart
3.8
4.1
Multiburst
5.2
7.3
White Text on Black Background
6.1
8.9
Windows Pattern
3.4
4.3
Windows Pattern
3.7
4.4
Windows Pattern
5.0
6.2
Vertical Lines 5 On 5 Off
4.6
6.3
Vertical Lines 4 On 4 Off
5.0
7.1
Vertical Lines 3 On 3 Off
5.6
8.7
Vertical Lines 2 On 2 Off
7.2
11.4
Vertical Lines 1 On 1 Off
11.5
15.4
Note: Input from signal generator: tr,tf < 2 ns.
Theory of Operation
The LM2429 is a high voltage monolithic three channel CRT
driver suitable for HDTV applications. The LM2429 operates
with 180V and 8V power supplies. The part is housed in the
industry standard 11-lead TO-220 molded plastic power
package with thin leads for improved metal-to-metal spacing.
The circuit diagram of the LM2429 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
LM2429. This circuit is designed to allow testing of the
LM2429 in a 50
Ω environment without the use of an expen-
sive FET probe. In this test circuit, the two 4.99k
Ω resistors
form a 400:1 wideband, low capacitance probe when con-
nected to a 50
Ω coaxial cable and a 50Ω load (such as a
50
Ω 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 LM2429 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 LM2429. If another
member of the LM242X family is used, please refer to its
datasheet.
www.national.com
6


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