lm2418

Manufacturer Part Numberlm2418
DescriptionTriple 30 Mhz Crt Driver
ManufacturerNational Semiconductor Corporation
lm2418 datasheet
 


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LM2418 Triple 30 MHz CRT Driver
General Description
The LM2418 contains three large signal voltage amplifiers
designed to directly drive CRT cathodes for VGA Color
Graphics Displays Output swings greater than 50 V
achieved with a 90V power supply The nominal voltage
gain of each amplifier is
19 with gain matching of 1 0 dB
b
between amplifiers
Packaging is the industry standard molded 11 lead TO-220
The heatsink tab is isolated and may be grounded to im-
prove RFI shielding and simplify assembly
Schematic and Connection Diagram
(One Section)
FIGURE 1
C 1995 National Semiconductor Corporation
TL K 11125
Features
50 Vpp output at 30 MHz drives CRT directly
Y
Rise fall time typically 12 ns with 8 pF load
Y
are
65V output swing capability
PP
Y
Optimized output stage for low crossover distortion
Y
Gain matching of 1 dB
Y
Voltage gain of
19
b
Y
Includes oscillation supression resistors
Y
Applications
CRT driver for RGB monitors
Y
High voltage amplifiers
Y
TL K 11125 – 1
Order Number LM2418T
See NS Package Number TA11B
January 1995
TL K 11125 – 2
Top View
RRD-B30M115 Printed in U S A

lm2418 Summary of contents

  • Page 1

    ... LM2418 Triple 30 MHz CRT Driver General Description The LM2418 contains three large signal voltage amplifiers designed to directly drive CRT cathodes for VGA Color Graphics Displays Output swings greater than 50 V achieved with a 90V power supply The nominal voltage gain of each amplifier is ...

  • Page 2

    ... Note 3 Guaranteed parameter not tested AC Test Circuit Figure 2 shows a typical test circuit for evaluation of the LM2418 This circuit is designed to allow testing of the LM2418 in a 50X environment such as a pulse generator oscilloscope or network analyzer total load capacitance It includes all parasitic capacitance ...

  • Page 3

    ... The heat sink is electrically isolated from the circuitry and may be grounded for ease of manufacturing and RFI shield- ing The circuit diagram of the LM2418 is shown in Figure 1 Q1 and R2 provide a conversion of input voltage to current while Q2 acts as a common base or cascode amplifier stage to drive the load resistor R1 Emitter followers Q3 and Q4 ...

  • Page 4

    ... Typical Application A typical application of the LM2418 is shown in Figure 6 Used in conjunction with an LM1203 a complete video channel from monitor input to CRT cathode is shown Per- formance is satisfactory for all applications up to 640 by 480 lines Typical rise fall times of this circuit are 15 ns with FIGURE 6 Typical Application LM1203-LM2418 Application ...

  • Page 5

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  • Page 6

    ... Italiano 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 Order Number LM2418T NS Package Number TA11B 2 A critical component is any component of a life ...