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PDF 5962-9232501MXA Data sheet ( Hoja de datos )
| Número de pieza | 5962-9232501MXA | |
| Descripción | 3A/ 55V H-Bridge | |
| Fabricantes | National Semiconductor | |
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December 1999
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 RDS(ON) typically 0.3Ω per switch
n TTL and CMOS compatible inputs
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
Functional Diagram
FIGURE 1. Functional Block Diagram of LMD18200
DS010568-1
© 1999 National Semiconductor Corporation DS010568
www.national.com
1 page  
Test Circuit
Switching Time Definitions
DS010568-8
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 H-bridge number 1 output.
Pin 3, DIRECTION Input: See Table 1. This input controls
the direction of current flow between OUTPUT 1 and OUT-
PUT 2 (pins 2 and 10) and, therefore, the direction of rotation
of a motor load.
Pin 4, BRAKE Input: See Table 1. This input is used to
brake a motor by effectively shorting its terminals. When
braking is desired, this input is taken to a logic high level and
DS010568-9
it is also necessary to apply logic high to PWM input, pin 5.
The drivers that short the motor are determined by the logic
level at the DIRECTION input (Pin 3): with Pin 3 logic high,
both current sourcing output transistors are ON; with Pin 3
logic low, both current sinking output transistors are ON. All
output transistors can be turned OFF by applying a logic high
to Pin 4 and a logic low to PWM input Pin 5; in this case only
a small bias current (approximately −1.5 mA) exists at each
output pin.
Pin 5, PWM Input: See Table 1. How this input (and DIREC-
TION input, Pin 3) is used is determined by the format of the
PWM Signal.
5 www.national.com
5 Page 
Typical Applications (Continued)
FIGURE 11. Regulate Velocity with Tachometer Feedback
DS010568-14
DS010568-15
FIGURE 12. Motor Speed vs
Control Voltage
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet 5962-9232501MXA.PDF ] | |
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