|
|
PDF A3909 Data sheet ( Hoja de datos )
| Número de pieza | A3909 | |
| Descripción | Dual Full Bridge Motor Driver | |
| Fabricantes | Allegro | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de A3909 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
A3909
Dual Full Bridge Motor Driver
Features and Benefits
• Low RDS(on) outputs
• Drives two DC motors or single stepper motor
• Low power standby (Sleep) mode with zero current drain
• Thermal shutdown protection
• Parallel operation option for 1.8 A, single DC motor
• Overcurrent protection:
▫ Output to supply short
▫ Output to GND short
▫ Output load short
Packages:
Description
The A3909 is a dual full bridge motor driver, designed for
12 V medium power applications. The outputs are rated for
operation through a power supply range of 4 to 18 V, and
capable of up to 1 A per phase.
Paralleling the outputs is possible for higher amperage single
DC motor applications.
The four inputs (IN1 to IN4) can control DC motors in forward,
reverse, brake, and coast modes, or a bipolar stepper motor in
full- and half-step modes.
TheA3909 is supplied in a 10-pin MSOPpackage with exposed
thermal pad (suffix LY) and a 10-pin SSOP (suffix LN) for
wave solder applications. Both packages are lead (Pb) free
with 100% matte-tin leadframe plating.
10-pin MSOP
with exposed thermal pad
(LY package)
Not to scale
10-pin SSOP
(LN package)
IN1
IN2
IN3
IN4
A3909-DS
Functional Block Diagram
VBB
Load Supply
Control
Logic
Disable
TSD
UVLO
OCP
VBB
Control
Logic
Disable
TSD
UVLO
OCP
VBB
PAD
LY package
OUT1
OUT2
GND
VBB
OUT3
OUT4
GND
Configuration
for driving
2 DC motors
VBB
Load Supply
OUT1
OUT2
GND
OUT3
OUT4
Configuration
for parallel operation
at 1.8 A
1 page  
A3909
Dual Full Bridge Motor Driver
Functional Description
Device Operation
The 3909 is designed to operate two DC motors or a single
stepper motor. The outputs are PMOS source drivers combined
with low RDS(on) DMOS sink drivers.
Protection circuitry includes internal thermal shutdown, protec-
tion against shorted loads, and against outputs shorted to GND
or supply. Undervoltage lockout prevents damage by keeping the
outputs off until the driver has enough voltage to operate nor-
mally.
A low power standby (Sleep) mode is activated when all inputs
are low for longer than 1 ms. Sleep mode disables all of the cir-
cuitry making the IC ideal for battery operated applications.
Overcurrent Protection (OCP)
The A3909 is protected against accidental shorts or motor outputs
to ground and supply, as well as a shorted load condition. For
the source drivers, the current is monitored after the MOSFET is
turned on. If the current exceeds 1.8 A for longer than 2 μs, then
a fault condition is asserted. The sink driver utilizes a drain-to-
source voltage monitor. If the voltage exceeds 2 V for longer than
2 μs, the fault condition is asserted.
When a fault occurs, the IC immediately disables both sides of
the full bridge where the fault occurred. The full bridge input
commands will be ignored for a 2 ms period before being allowed
to retry. Each channel has independent overcurrent protection.
During OCP events, the absolute ratings may be exceeded for a
short period of time before the outputs are disabled.
Thermal Shutdown
If the die temperature increases to TJTSD , then all outputs are dis-
abled until the internal temperature falls below a hysteresis level,
TTSDHYS, of 20°C. Internal UVLO is detected on VBB to prevent
output drivers from turning on when below the UVLO threshold.
IN1
IN2
OUT1
OUT2
Current (1Æ2)
DC Motor Timing Diagram
tSTANDBY
23
45
6
7
1) Low power standby (Sleep) mode (IBB = 0)
2) On, reverse – 100% duty cycle
3) On, forward – 100% duty cycle
4) Slow decay PWM
5) Fast decay PWM
6) Coast
7) Low power standby (Sleep) mode
after tSTANBY (IBB = 0)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet A3909.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| A390 | SILICON RECTIFIER |  Powerex Power Semiconductors |
| A3901 | Dual Full Bridge Low Voltage Motor Driver | Allegro |
| A3903 | Low Voltage DC Motor Driver |  Allegro Micro Systems |
| A3904 | Low Voltage Voice Coil Motor Driver |  Allegro MicroSystems |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |