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PDF A1442 Data sheet ( Hoja de datos )
| Número de pieza | A1442 | |
| Descripción | Low Voltage Full Bridge Brushless DC Motor Driver | |
| Fabricantes | Allegro Microsystems | |
| Logotipo |  |
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A1442
Low Voltage Full Bridge Brushless DC Motor Driver with Hall Commutation and
Soft-Switching, and Reverse Battery, Short Circuit, and Thermal Shutdown Protection
Features and Benefits
▪ Low voltage operation
▪ Reverse voltage protection on VDD and S¯¯L¯¯E¯¯E¯¯P pins
▪ Output short circuit and thermal shutdown protections
▪ Soft switching algorithm to reduce audible switching
noise and EMI interference
▪ Unidirectional working mode provides motor rotation in
one direction
▪ Hall chopper stabilization technique for precise signal
response over operating range
▪ Sleep mode pin allowing external logic signal enable/
disable to reduce average power consumption
▪ Antistall feature guarantees continuous rotation
▪ Low current consumption sleep mode
▪ Single-chip solution for high reliability
▪ Miniature MLP/DFN package
Package: 6 pin MLP/DFN (suffix EW)
1.5 mm × 2 mm, 0.40 mm maximum overall height
Approximate scale
Description
The A1442 is a full-bridge motor driver designed to drive
low-voltage, brushless dc motors. Commutation of the motor
is achieved by use of a single Hall element sensor to detect the
rotational position of an alternating-pole ring magnet. A high-
density CMOS semiconductor process allows the integration
of all the necessary electronics. This includes the Hall element
sensor, the motor control circuitry, and the full output bridge.
Low-voltage design techniques have been employed to achieve
full device functionality down to low VDD values. This fully
integrated single chip solution provides enhanced reliability
(including reverse battery protection and output short circuit
protection) and eliminates the need for any external support
components.
TheA1442 employs a soft-switching algorithm to reduce audible
switching noise and EMI interference. A micropower sleep
mode can be enabled by an external signal, to reduce current
consumption for battery management in portable electronic
devices. This feature allows the removal of a FET transistor
for switching the device on and off.
The A1442 is optimized for vibration motor applications in
cellular phones, pagers, electronic toothbrushes, hand-held
video game controllers, and low power fan motors.
The small package outline and low profile make this device
ideally suited for use in applications where printed circuit board
area and component headroom are at a premium. It is available
in a lead (Pb) free, 6 pin MLP/DFN microleadframe package,
with an exposed pad for enhanced thermal dissipation.
Functional Block Diagram
VDD
SLEEP
0.1 μF
Reverse Battery
Power and Sleep
Mode Control
Active Braking
Control
Hall
Element
Stall Detection
Amp
Drive Logic
and
Soft Start
Control
Thermal Shutdown
Protection
Output
Full Bridge
Q1
Q3
Q2
Q4
GND
A1442-DSS
VOUT1
VOUT2
M
1 page  
www.DataSheet4U.com
A1442
Low Voltage Full Bridge Brushless DC Motor Driver
with Hall Commutation and Soft-Switching,
and Reverse Battery, Short Circuit, and Thermal Shutdown Protection
Application Information
Two typical application circuits are shown in figures 4 and 5. The
first application circuit shows the device S¯¯L¯¯E¯¯E¯¯P pin controlled
by the user. Figure 5 illustrates an application circuit where the
device VDD and S¯¯L¯¯E¯¯E¯¯P pin are connected together.
Note that:
• No external diode is required for reverse battery protection
because the protection is fully integrated into the IC.
• Thermal shutdown is integrated also.
A bypass capacitor of 0.1 μF is required between VDD and GND
for proper device operation through the full specified supply volt-
age range.
VBATT
System Logic
Control
I/O
VDD
VOUT1
CBYP A1442
SLEEP
VOUT2
NC GND
M
Figure 4. Application circuit showing user-controlled sleep/enable mode, while the
A1442 remains powered at all times
VBATT
System Logic
Control
I/O
VDD
VOUT1
A1442
CBYP
SLEEP
VOUT2
NC GND
M
Figure 4. Application circuit showing simultaneous user control of power supply and
sleep mode.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet A1442.PDF ] | |
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