LM9022N National Semiconductor, LM9022N Datasheet

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LM9022N

Manufacturer Part Number
LM9022N
Description
Vacuum Fluorescent Display Filament Driver
Manufacturer
National Semiconductor
Datasheet
© 2002 National Semiconductor Corporation
LM9022
Vacuum Fluorescent Display Filament Driver
General Description
The LM9022 is a bridged power amplifier capable of deliv-
ering typically 2W of continuous average power into a 10Ω
filament load when powered by a 5V power supply.
To conserve power in portable applications, the LM9022’s
micropower shutdown mode (I
when V
Additional LM9022 features include thermal shutdown pro-
tection, unity-gain stability, and external gain set.
Typical Application
Connection Diagram
DD
is applied to the SHUTDOWN pin.
Q
= 0.6µA, typ) is activated
T
A
= 25˚C, V
DS200215
See NS Package Number M08A or N08E
MSOP, Small Outline, and DIP Package
FIGURE 1. Typical Application Circuit
Order Number LM9022M or LM9022N
DD
= 5V, unless otherwise specified.
Top View
Key Specifications
n I
n Thermal Shutdown Protection
Features
n No transformers required
n SO or DIP packaging
Applications
n VCR/DVD Displays
n RADIO/TUNER Displays
DD
20021502
during shutdown
www.national.com
20021501
0.6µA (typ)
July 2002

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LM9022N Summary of contents

Page 1

... SO or DIP packaging Applications n VCR/DVD Displays n RADIO/TUNER Displays = 25˚ 5V, unless otherwise specified. DD FIGURE 1. Typical Application Circuit MSOP, Small Outline, and DIP Package 20021502 Top View Order Number LM9022M or LM9022N See NS Package Number M08A or N08E DS200215 July 2002 0.6µA (typ) 20021501 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 Supply Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 3

Typical Performance Characteristics T = 25˚ 5V, unless otherwise specified Power Derating Curve Open Loop Frequency Response Differential Output Voltage vs Load Output Saturation Voltage 20021514 20021519 20021540 3 vs Load 20021515 Supply Current vs Supply ...

Page 4

Application Information LM9022 FUNCTIONALITY Typically a VFD filament requires a low voltage AC power source in order to create a constant brightness across its length. Such a power source is not readily available in a most systems. Existing implementations show ...

Page 5

FIGURE 2. Filament Supply using External Oscillator FIGURE 3. Filament Supply using Self Oscillation 5 20021544 20021545 www.national.com ...

Page 6

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LM9022M NS Package Number M08A Order Number LM9022N NS Package Number N08E 6 ...

Page 7

... 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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