LM2445TA National Semiconductor, LM2445TA Datasheet

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LM2445TA

Manufacturer Part Number
LM2445TA
Description
IC,TV/VIDEO CIRCUIT,Driver,BIPOLAR,ZIP,9PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2445TA

Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2003 National Semiconductor Corporation
LM2445
Monolithic Triple 7.5 ns CRT Driver
General Description
The LM2445 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con-
tains three high input impedance, wide band amplifiers
which directly drive the RGB cathodes of a CRT. Each
channel has its gain internally set to −20 and can drive CRT
capacitive loads as well as resistive loads present in other
applications, limited only by the package’s power dissipation.
The IC is packaged in an industry standard 9-lead TO-220
molded plastic power package. See the Thermal Consider-
ations section for more information.
Schematic Diagram
FIGURE 1. Simplified Schematic Diagram
DS200637
(One Channel)
Features
n Higher gain to match LM126X CMOS preamplifiers
n 0V to 3.75V input range
n Stable with 0–20 pF capacitive loads and inductive
n Convenient TO-220 staggered lead package style
n Maintains standard LM243X Family pinout which is
Applications
n 1024 x 768 displays up to 85 Hz refresh
n Pixel clock frequencies up to 95 MHz
n Monitors using video blanking
peaking networks
designed for easy PCB layout
20063701
www.national.com
March 2003

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LM2445TA Summary of contents

Page 1

... The IC is packaged in an industry standard 9-lead TO-220 molded plastic power package. See the Thermal Consider- ations section for more information. Schematic Diagram © 2003 National Semiconductor Corporation Features n Higher gain to match LM126X CMOS preamplifiers 3.75V input range n Stable with 0–20 pF capacitive loads and inductive ...

Page 2

... Connection Diagram Note: Tab is at GND www.national.com 20063702 Top View Order Number LM2445TA 2 ...

Page 3

... Absolute Maximum Ratings 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Bias Voltage ( Input Voltage ( Storage Temperature Range (T ) STG Lead Temperature < (Soldering, 10 sec.) ESD Tolerance, Human Body Model Electrical Characteristics (See Figure 2 for Test Circuit) Unless otherwise noted ...

Page 4

AC Test Circuit Note load includes parasitic capacitance. Figure 2 shows a typical test circuit for evaluation of the LM2445. This circuit is designed to allow testing of the LM2445 in a 50Ω environment without the use of ...

Page 5

Typical Performance Characteristics (25V−65V), Test Circuit - Figure 2 unless otherwise specified) FIGURE OUT FIGURE 4. Speed vs Temp. FIGURE 5. LM2445 Pulse Response ( 20063704 FIGURE 6. Power Dissipation vs ...

Page 6

... 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 ...

Page 7

Application Hints (Continued) FIGURE 9. One Channel of the LM2445 with the Recommended Application Circuit 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 ...

Page 8

Application Hints (Continued) FIGURE 10. Red Cathode Response TABLE 1. LM2445 Cathode Response Channel t /OS r Red 6.3ns / 7% Green 6.1ns / 6% Blue 6.5ns / 3% PC BOARD LAYOUT CONSIDERATIONS For optimum performance, an adequate ground plane, ...

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9 www.national.com ...

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Application Hints (Continued) FIGURE 13. LM126X/LM246X Demo Board Layout 11 20063719 www.national.com ...

Page 12

Application Hints (Continued) FIGURE 14. Trace Routing and Component Placement for Blue Channel Output www.national.com 20063714 12 ...

Page 13

... Physical Dimensions inches (millimeters) unless otherwise noted CONTROLLING DIMENSION IS INCH VALUES ARE MILLIMETERS NS Package Number TA09A Order Number LM2445TA 13 www.national.com ...

Page 14

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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