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LMD18200 Datasheet

Download or read online National Semiconductor LMD18200 3A, 55V H-Bridge pdf datasheet.



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LMD18200 3A 55V H-Bridge
General Description
The LMD18200 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
Ideal for driving DC and stepper motors
LMD18200 accommodates peak output currents up to 6A
An innovative circuit which facilitates low-loss sensing of the
output current has been implemented
Features
Delivers up to 3A continuous output
Y
Operates at supply voltages up to 55V
Y
Low R
(ON) typically 0 3
per switch
Y
DS
Functional Diagram
Connection Diagram and Ordering Information
Top View
C 1996 National Semiconductor Corporation
TL H 10568
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
the
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
Order Number LMD18200T
See NS Package TA11B
TL H 10568 – 2
RRD-B30M96 Printed in U S A
September 1996
TL H 10568 – 1
http
www national com

Summary of Contents

Page 1

... LMD18200 3A 55V H-Bridge General Description The LMD18200 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 Ideal for driving DC and stepper motors ...

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... 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) ...

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Electrical Characteristics Notes 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 LMD18200 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 LMD18200 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 this in- ...

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Test Circuit Switching Time Definitions http www national com TL H 10568 – 10568 8 ...

Page 7

Typical Applications Fixed Off-Time Control This circuit controls the current through the motor by applying an average voltage equal to zero to the motor terminals for a fixed period of time when- ever the current through the motor exceeds the ...

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... Typical Applications (Continued) TORQUE REGULATION Locked Anti-Phase Control of a brushed DC motor Current sense output of the LMD18200 provides load sensing The LM3525A is a general purpose PWM controller http www national com Peak Motor Current vs Adjustment Voltage TL H 10568– 10568 12 ...

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Typical Applications (Continued) VELOCITY REGULATION Utilizes tachometer output from the motor to sense motor speed for a locked anti-phase control loop Motor Speed vs Control Voltage TL H 10568 – 10568 14 http www national ...

Page 10

... 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 LMD18200T NS Package Number TA11B 2 A critical component is any component of a life ...

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