LM9022_05 NSC [National Semiconductor], LM9022_05 Datasheet

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LM9022_05

Manufacturer Part Number
LM9022_05
Description
Vacuum Fluorescent Display Filament Driver
Manufacturer
NSC [National Semiconductor]
Datasheet
© 2005 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
August 2005
20021501
0.6µA (typ)

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LM9022_05 Summary of contents

Page 1

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 power supply. To conserve power ...

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 ...

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

Application Information FIGURE 2. Filament Supply using External Oscillator FIGURE 3. Filament Supply using Self Oscillation (Continued) 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 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. For the most current product information ...

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