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PDF A1448 Data sheet ( Hoja de datos )
| Número de pieza | A1448 | |
| Descripción | Low-Voltage Full-Bridge Brushless DC Motor Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A1448 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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A1448
www.DataSheet4U.com
Low-Voltage, Full-Bridge Brushless DC Motor Driver with
Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching,
and Reverse Battery and Short Circuit Protection
Features and Benefits
▪ Low-voltage operation, 1.8 to 4.2 V
▪ Multifunction CONTROL pin input:
▫ Direct input PWM for speed control
▫ Active braking for fast stop cycle
▫ Sleep function to reduce average power consumption
▪ Reverse voltage protection on VDD and CONTROL pins
▪ Output thermal shutdown protection for robust performance
▪ Soft switching algorithm to reduce audible switching noise
and EMI
▪ Hall chopper stabilization technique for precise signal
response over operating range
▪ Antistall feature guarantees continuous rotation and
prevents overheating
▪ Single-chip solution for high reliability
▪ Miniature MLP/DFN package with industry-leading
0.40 mm maximum overall thickness
Package:
6-contact MLP/DFN
1.5 mm × 2 mm
0.40 mm maximum overall height
(EW package)
Approximate size
Description
The A1448 is a full-bridge motor driver designed to drive
low-voltage, brushless DC motors. The device is designed
to allow the user to control several functions with a single
input control pin. The pin allows for direct input PWM for
speed control, is used to initiate the active braking func-
tion to reduce motor stop time, and acts as an enable pin to
engage micro-power sleep mode to reduce average power
consumption when not in use. The A1448 is designed for
use in vibration motor applications in portable devices that
require fast stop-start cycles, such as haptic applications and
vibration ring tones.
Commutation of the motor is achieved by use of a single
Hall element to detect the rotational position of an alternat-
ing-pole ring magnet. A high density CMOS semiconductor
process allows the integration of all the necessary electron-
ics. This includes the Hall element, the motor control cir-
cuitry, and the output full bridge. Low-voltage design tech-
niques have been employed to achieve full device function-
ality down to 1.8 V VDD. 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.
The A1448 employs a soft-switching algorithm to reduce
audible switching noise and EMI interference. The micro-
power sleep mode can be initiated on the CONTROL pin,
and reduces current consumption for battery management in
Continued on the next page…
Functional Block Diagram
VDD
Reverse Battery
ESD
CONTROL
To All Subcircuits
Active Braking
Sleep Mode
PWM Control
Drive
Logic
Full Bridge
Q1
Amp
Stall Detection
Thermal Shutdown
Protection
Q3
Q2
VOUT1
ESD
VOUT2
Q4
1448-DS, Rev. 3
GND
1 page  
A1448
Low-Voltage, Full-Bridge Brushless DC Motor Driver with
Integrated Hall Sensor IC, PWM Speed Conwtrwowl.,DSatoafSht-eSetw4Ui.tccohming,
and Reverse Battery and Short Circuit Protection
Application Information
Figure 2 shows a typical vibration motor application in which
speed control, active braking, and sleep mode are required on the
CONTROL pin.
Figure 3 shows an application circuit in which 100% duty cycle
is required. Tying the CONTROL pin to VDD disables the braking
function and the sleep mode. The user must control supply in
order to control the speed of the motor. This represents a 2-wire
motor design.
Note that:
• No external diode is required for reverse battery protection
because the protection is fully integrated into the IC.
• Thermal shutdown also is integrated, to protect the device
against inadvertent output shorts during manufacturing or
testing.
• A bypass capacitor of 0.1 μF is required. This capacitor is usu-
ally included on the end user PCB and therefore not necessary
on the motor PCB.
VBATT
System Logic
Control
I/O
VDD
VOUT2
CBYP A1448
CONTROL
VOUT1
NC GND
M
Figure 2. Three-wire vibration motor application circuit
VBATT
CBYP
VDD
VOUT2
A1448
CONTROL
VOUT1
NC GND
M
Figure 3. Two-wire vibration motor application circuit
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 7 Páginas | |
| PDF Descargar | [ Datasheet A1448.PDF ] | |
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