LM1921T National Semiconductor, LM1921T Datasheet

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LM1921T

Manufacturer Part Number
LM1921T
Description
IC 1 AMP INDUSTRIAL SWITCH TO220
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1921T

Mounting Type
Through Hole
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Supply
-
Number Of Drivers/receivers
-
Protocol
-
Other names
*LM1921T
C 1995 National Semiconductor Corporation
LM1921 1 Amp Industrial Switch
General Description
The LM1921 Relay Driver incorporates an integrated power
PNP transistor as the main driving element The advantages
of this over previous integrated circuits employing NPN
power elements are several Greater output voltages are
available off the same supply for driving grounded loads
typically 4 5 volts for a 500 mA load from a 5 0 volt supply
The output can swing below ground potential up to 57 volts
negative with respect to the positive power supply This can
be used to facilitate rapid decay times in inductive loads
Also the IC is immune to negative supply voltages or tran-
sients The inherent Safe Operating Area of the lateral PNP
allows use of the IC as a bulb driver or for capacitive loads
Familiar integrated circuit features such as short circuit pro-
tection and thermal shutdown are also provided The input
voltage threshold levels are designed to be TTL CMOS
and LSTTL compatible over the entire operating tempera-
ture range If several drivers are used in a system their
inputs and or outputs may be combined and wired together
if their supply voltages are also common
Typical Application Circuit
Connection Diagram
TL H 5271
FIGURE 1 Test and Application Circuit
Front View
See NS Package Number T05A
Order Number LM1921T
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
Y
1 Amp output drive
Load connected to ground
Low input-output voltage differential
b
Automotive reverse battery protection
Short circuit proof
Internal thermal overload protection
Unclamped output for fast decay times
TTL LSTTL CMOS compatible input
Plastic TO-220 package
100% electrical burn-in
Relays
Solenoids
Valves
Motors
Lamps
Heaters
a
60 volt positive transient protection
50 volt negative transient protection
Required for stability
TL H 5271 – 2
RRD-B30M115 Printed in U S A
February 1995
TL H 5271 – 1

Related parts for LM1921T

LM1921T Summary of contents

Page 1

... Unclamped output for fast decay times Y TTL LSTTL CMOS compatible input Y Plastic TO-220 package Y 100% electrical burn-in Y Applications Relays Y Solenoids Y Valves Y Motors Y Lamps Y Heaters Y Front View Order Number LM1921T See NS Package Number T05A February 1995 Required for stability TL H 5271 – 5271 – 2 RRD-B30M115 Printed ...

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 Operating Range Overvoltage Protection (100 ms) Electrical Characteristics (V Parameter Conditions Supply Voltage Operational Survival Transient 100 ms 1% Duty Cycle ...

Page 3

Typical Performance Characteristics Output Voltage Drop TL H 5271–3 Output Voltage Drop TL H 5271–6 ON OFF Current vs Junction Temperature TL H 5271– 13 Equivalent Block Diagram Device Operating Current TL H 5271 – 4 Output Voltage (V ) ...

Page 4

Circuit Schematic 4 ...

Page 5

Application Hints HIGH CURRENT OUTPUT The 1 Amp output is fault protected against overvoltage If the supply voltage rises above approximately 30 volts the output will automatically shut down This protects the inter- nal circuitry and enables the IC to ...

Page 6

... 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 5-Lead TO-220 Power Package (T) Order Number LM1921T NS Package Number T05A 2 A critical component is any component of a life ...

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