LM2438T National Semiconductor, LM2438T Datasheet

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LM2438T

Manufacturer Part Number
LM2438T
Description
IC DRIVER MONOLITHIC TO-220-9
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2438T

Display Type
CRT
Current - Supply
18mA
Voltage - Supply
60 V ~ 85 V
Operating Temperature
-20°C ~ 100°C
Mounting Type
Through Hole
Package / Case
TO-220-9 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Interface
-
Configuration
-
Digits Or Characters
-
Other names
*LM2438T

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2438T
Manufacturer:
NS/国半
Quantity:
20 000
© 1999 National Semiconductor Corporation
LM2438
Monolithic Triple 13.5 ns CRT Driver
General Description
The LM2438 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 chan-
nel has its gain internally set to −14 and can drive CRT ca-
pacitive loads as well as resistive loads present in other ap-
plications, 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 Thermal Considerations
section.
Schematic and Connection Diagrams
FIGURE 1. Simplified Schematic Diagram
(One Channel)
DS101043
DS101043-1
Features
n Well matched with LM1279 video preamp
n 0V to 5V input range
n Stable with 0–20 pF capacitive loads and inductive
n Convenient TO-220 staggered lead package style
n Standard LM243X Family Pinout which is designed for
Applications
n 1024 x 768 displays up to 60 Hz refresh
n Pixel clock frequencies up to 60 MHz
n Monitors using video blanking
Note: Tab is at GND
peaking networks
easy PCB layout
Order Number LM2438T
Top View
DS101043-2
www.national.com
August 1999

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LM2438T Summary of contents

Page 1

... Convenient TO-220 staggered lead package style n Standard LM243X Family Pinout which is designed for easy PCB layout Applications n 1024 x 768 displays refresh n Pixel clock frequencies MHz n Monitors using video blanking Note: Tab is at GND Top View Order Number LM2438T DS101043-1 August 1999 DS101043-2 www.national.com ...

Page 2

... Absolute Maximum Ratings 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 Electrical Characteristics (See Figure 2 for Test Circuit) Unless otherwise noted +80V, V ...

Page 3

Typical Performance Characteristics (25V−65V), Test Circuit - Figure 2 unless otherwise specified) DS101043-4 FIGURE OUT IN DS101043-5 FIGURE 4. Speed vs Temp. DS101043-6 FIGURE 5. LM2438 Pulse Response ( +12 ...

Page 4

Typical Performance Characteristics (25V−65V), Test Circuit - Figure 2 unless otherwise specified) (Continued) www.national.com ( DS101043-9 FIGURE 8. Speed vs Load Capacitance for Various Inductances ...

Page 5

... 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 follow- ing information is provided in order to support this commit- ment ...

Page 6

Application Hints (Continued) FIGURE 9. One Channel of the LM2438 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- ...

Page 7

Application Hints (Continued) NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM1279/2438 demonstration board. The schematic of the board is shown in Figure 11 . This board provides a good example of a layout ...

Page 8

Application Hints (Continued) www.national.com 8 ...

Page 9

Application Hints (Continued) FIGURE 12. LM1279/243X Demo Board Layout 9 DS101043-13 www.national.com ...

Page 10

Application Hints (Continued) FIGURE 13. Trace Routing and Component Placement for Red Channel Output www.national.com DS101043-14 10 ...

Page 11

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. NS Package Number TA09A Order Number LM2438T 2. A critical component is any component of a life ...

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