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LMD18200-2D-QV Datasheet

Download or read online National Semiconductor LMD18200-2D-QV 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 control
applications. The device is built using a multi-technology pro-
cess which combines bipolar and CMOS control circuitry
with DMOS power devices on the same monolithic structure.
Ideal for driving DC and stepper motors; the LMD18200 ac-
commodates peak output currents up to 6A. An innovative
circuit which facilitates low-loss sensing of the output current
has been implemented.
Features
n Delivers up to 3A continuous output
n Operates at supply voltages up to 55V
n Low R
(ON) typically 0.3
per switch
DS
n TTL and CMOS compatible inputs
Functional Diagram
FIGURE 1. Functional Block Diagram of LMD18200
© 1999 National Semiconductor Corporation
DS010568
n No “shoot-through” current
n Thermal warning flag output at 145˚C
n Thermal shutdown (outputs off) at 170˚C
n Internal clamp diodes
n Shorted load protection
n Internal charge pump with external bootstrap capability
Applications
n DC and stepper motor drives
n Position and velocity servomechanisms
n Factory automation robots
n Numerically controlled machinery
n Computer printers and plotters
December 1999
DS010568-1
www.national.com

Summary of Contents

Page 1

... The device is built using a multi-technology pro- cess which combines bipolar and CMOS control circuitry with DMOS power devices on the same monolithic structure. Ideal for driving DC and stepper motors; the LMD18200 ac- commodates peak output currents up to 6A. An innovative circuit which facilitates low-loss sensing of the output current has been implemented ...

Page 2

... Connection Diagrams and Ordering Information www.national.com 11-Lead TO-220 Package Top View Order Number LMD18200T See NS Package TA11B DS010568-25 24-Lead Dual-in-Line Package Top View Order Number LMD18200-2D-QV 5962-9232501VXA LMD18200-2D/883 5962-9232501MXA See NS Package DA24B 2 DS010568-2 ...

Page 3

... 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) ...

Page 4

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 op- erating the device beyond its rated operating conditions. Note 2: See Application ...

Page 5

Test Circuit Switching Time Definitions Pinout Description (See Connection Diagram) Pin 1, BOOTSTRAP 1 Input: Bootstrap capacitor pin for half H-bridge number 1. The recommended capacitor (10 nF) is connected between pins 1 and 2. Pin 2, OUTPUT 1: Half ...

Page 6

... Current delivered to the load is propor- tional to pulse width. For the LMD18200, the DIRECTION in- put (pin 3) is driven by the sign signal and the PWM input (pin 5) is driven by the magnitude signal. ...

Page 7

... V supply line) serves to reduce the mag- CC nitude of a current surge to a safe level for the LMD18200. Once the device is shut down, the control circuitry will peri- odically try to turn the power device back on. This feature al- lows the immediate return to normal operation in the event that the fault condition has been removed ...

Page 8

... A major consideration when switching current through induc- tive loads is protection of the switching power devices from the large voltage transients that occur. Each of the four switches in the LMD18200 have a built-in protection diode to clamp transient voltages exceeding the positive supply or ground to a safe diode voltage drop across the switch. ...

Page 9

... 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. The relationship of peak motor current to adjustment voltage is shown in Figure 10 . FIGURE 7. Fixed Off-Time Control FIGURE 8. Switching Waveforms ...

Page 10

Typical Applications (Continued) FIGURE 9. Locked Anti-Phase Control Regulates Torque VELOCITY REGULATION Utilizes tachometer output from the motor to sense motor speed for a locked anti-phase control loop. The relationship of motor speed to the speed adjustment control voltage is ...

Page 11

Typical Applications (Continued) FIGURE 11. Regulate Velocity with Tachometer Feedback DS010568-15 FIGURE 12. Motor Speed vs Control Voltage 11 DS010568-14 www.national.com ...

Page 12

... Physical Dimensions inches (millimeters) unless otherwise noted www.national.com 11-Lead TO-220 Power Package (T) Order Number LMD18200T NS Package Number TA11B 12 ...

Page 13

... 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. 24-Lead Dual-in-Line Package Order Number LMD18200-2D-QV 5962-9232501VXA LMD18200-2D/883 ...

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