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| 型號(hào)： | 55VDMOSFULL-BRIDGEMOTORDRIVER |
| 英文描述： | (647.67 k) |
| 中文描述： | （647.67十一） |
| 文件頁(yè)數(shù)： | 1/18頁(yè) |
| 文件大小： | 647K |
| 代理商： | 55VDMOSFULL-BRIDGEMOTORDRIVER |
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LMD18245
3A, 55V DMOS Full-Bridge Motor Driver
General Description
The LMD18245 full-bridge power amplifier incorporates all
the circuit blocks required to drive and control current in a
brushed type DC motor or one phase of a bipolar stepper
motor. The multi-technology process used to build the device
combines bipolar and CMOS control and protection circuitry
with DMOS power switches on the same monolithic struc-
ture. The LMD18245 controls the motor current via a fixed
off-time chopper technique.
An all DMOS H-bridge power stage delivers continuous out-
put currents up to 3A (6A peak) at supply voltages up to 55V.
The DMOS power switches feature low R
for high ef-
ficiency, and a diode intrinsic to the DMOS body structure
eliminates the discrete diodes typically required to clamp bi-
polar power stages.
An innovative current sensing method eliminates the power
loss associated with a sense resistor in series with the motor.
A four-bit digital-to-analog converter (DAC) provides a digital
path for controlling the motor current, and, by extension, sim-
plifies implementation of full, half and microstep stepper mo-
tor drives. For higher resolution applications, an external
DAC can be used.
Features
n
DMOS power stage rated at 55V and 3A continuous
n
Low R
DS(ON)
of typically 0.3
per power switch
n
Internal clamp diodes
n
Low-loss current sensing method
n
Digital or analog control of motor current
n
TTL and CMOS compatible inputs
n
Thermal shutdown (outputs off) at T
J
= 155C
n
Overcurrent protection
n
No shoot-through currents
n
15-lead TO-220 molded power package
Applications
n
Full, half and microstep stepper motor drives
n
Stepper motor and brushed DC motor servo drives
n
Automated factory, medical and office equipment
Functional Block and Connection Diagram
(15-Lead TO-220 Molded Power Package (T) )
DS011878-1
Order Number LMD18245T
See NS Package Number TA15A
April 1998
L
1998 National Semiconductor Corporation
DS011878
www.national.com
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