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LMD18201 Datasheet

Download or read online National Semiconductor LMD18201 3-Amp, 55 Volt H-Bridge pdf datasheet.



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LMD18201 3A 55V H-Bridge
General Description
The LMD18201 is a 3A H-Bridge designed for motion con-
trol applications The device is built using a multi-technology
process which combines bipolar and CMOS control circuitry
with DMOS power devices on the same monolithic struc-
ture The H-Bridge configuration is ideal for driving DC and
stepper motors The LMD18201 accommodates peak out-
put currents up to 6A Current sensing can be achieved via
a small sense resistor connected in series with the power
ground lead For current sensing without disturbing the path
of current to the load the LMD18200 is recommended
Features
Delivers up to 3A continuous output
Y
Operates at supply voltages up to 55V
Y
Low R
typically 0 33
per switch
Y
DS(ON)
Functional Diagram
Connection Diagram and Ordering Information
Top View
C 1996 National Semiconductor Corporation
TL H 10793
September 1996
TTL and CMOS compatible inputs
Y
No ‘‘shoot-through’’ current
Y
Thermal warning flag output at 145 C
Y
Thermal shutdown (outputs off) at 170 C
Y
Internal clamp diodes
Y
Shorted load protection
Y
Internal charge pump with external bootstrap capability
Y
Applications
DC and stepper motor drives
Y
Position and velocity servomechanisms
Y
Factory automation robots
Y
Numerically controlled machinery
Y
Computer printers and plotters
Y
TL H 10793 – 1
Order Number LMD18201T
See NS Package Number TA11B
TL H 10793 – 2
http
RRD-B30M96 Printed in U S A
www national com

Summary of Contents

Page 1

... LMD18201 3A 55V H-Bridge General Description The LMD18201 H-Bridge designed for motion con- trol applications The device is built using a multi-technology process which combines bipolar and CMOS control circuitry with DMOS power devices on the same monolithic struc- ture The H-Bridge configuration is ideal for driving DC and ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Total Supply Voltage (V Pin 6) S Voltage at Pins and 9 Voltage at Bootstrap Pins (Pins 1 and 11) Peak Output Current (200 ms) Continuous Output Current (Note 2) ...

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Electrical Characteristics (Continued) Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions Note 2 See Application Information ...

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... Current delivered to the load is proportional to pulse width For the LMD18201 the DIRECTION input (pin 3) is driven by the sign signal and the PWM input (pin 5) is driven 1 5 mA) ex- ...

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... CURRENT LIMITING Current limiting protection circuitry has been incorporated into the design of the LMD18201 With any power device it is important to consider the effects of the substantial surge currents through the device that may occur as a result of shorted loads The protection circuitry monitors the current ...

Page 6

... To sense the bridge current through the LMD18201 requires the addition of a small sense resistor between the power ground sense pin (Pin 7) and the actual circuit ground This resistor should have a value ...

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7 http www national com ...

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... 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 LMD18201T NS Package Number TA11B 2 A critical component is any component of a life ...

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