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PDF A3906 Data sheet ( Hoja de datos )
| Número de pieza | A3906 | |
| Descripción | Low Voltage Stepper and Single/Dual DC Motor Driver | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A3906
Low Voltage Stepper and Single/Dual DC Motor Driver
Features and Benefits
▪ 2.5 to 9 V operation
▪ Internal PWM current limit control
▪ Synchronous rectification for reduced power dissipation
▪ Peak current output flag
▪ Undervoltage lockout
▪ Low RDS(on) outputs
▪ Small package
▪ Brake mode for DC motors
▪ Sleep function
▪ Crossover-current protection
▪ Thermal shutdown
Package: 20-contact QFN (suffix ES)
Approximate size
Description
Designed for pulse width modulated (PWM) control of low
voltage stepper motors, and single and dual DC motors, the
A3906 is capable of output currents up to 1 A per channel and
operating voltages from 2.5 to 9 V.
The A3906 has an internal fixed off-time PWM timer that
sets a peak current based on the selection of a current sense
resistor. An overcurrent output flag is provided that notifies
the user when the current in the motor winding reaches the
peak current determined by the sense resistor. The fault output
does not affect driver operation.
TheA3906 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced
thermal dissipation. It is lead (Pb) free, with 100% matte tin
leadframe plating.
Applications include the following:
▪ Digital still cameras (DSC)
▪ Cell phone cameras
▪ USB powered devices
▪ Battery powered devices
Typical Applications
+5 V
0.1 μF
0.1 μF
CP1 CP2 CP3 CP4
VCP
SLEEP
IN1
IN2
IN3
IN4
A3906
VBB
OUT1A
OUT1B
SENSE1
OUT2A
FL1
FL2 OUT2B
GND
SENSE2
0.1 μF
10 μF
10 V
M
M
+5 V
0.1 μF
0.1 μF
CP1 CP2 CP3 CP4
VCP
SLEEP
IN1
IN2
IN3
IN4
A3906
VBB
OUT1A
OUT1B
SENSE1
OUT2A
FL1 OUT2B
FL2 SENSE2
GND
0.1 μF
10 μF
10 V
M
Dual DC motor application
3906-DS, Rev. 4
Stepper motor application
1 page  
A3906
ILOAD
Low Voltage Stepper and Single/Dual DC Motor Driver
Fault Timing Diagram
ITRIP
FLx
Fault Asserted
tFLx Fault Asserted
NOTE: Timer resets after each reset of the PWM latch.
tFLx Fault Asserted
Control Logic
DC Motor Operation
IN1 IN2 IN3
000
101
010
111
IN4 OUT1A OUT1B OUT2A OUT2B
0 Off Off Off Off
0 High Low High Low
1 Low High Low High
1 Low Low Low Low
Function
Disabled
Forward
Reverse
Brake
Stepper Motor Operation
IN1 IN2 IN3 IN4 OUT1A OUT1B OUT2A OUT2B
Function
0
0
0
0 Off Off Off Off Disabled
Disabled
1
0
1
0
High Low High Low
Full Step 1
½ Step 1
0
0
1
0
Off
Off
High
Low
–
½ Step 2
0
1
1
0
Low High High Low
Full Step 2
½ Step 3
0
1
0
0
Low High
Off
Off
–
½ Step 4
0 1 0 1 Low High Low High Full Step 3 ½ Step 5
0 0 0 1 Off Off Low High
–
½ Step 6
1 0 0 1 High Low Low High Full Step 4 ½ Step 7
1
0
0
0
High
Low
Off
Off
–
½ Step 8
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 A3906.PDF ] | |
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