UDQ2916EB Allegro Microsystems Inc, UDQ2916EB Datasheet - Page 5
![IC MOTOR DRIVER PWM DUAL 44PLCC](/photos/31/36/313602/a6818sep-t_sml.jpg)
UDQ2916EB
Manufacturer Part Number
UDQ2916EB
Description
IC MOTOR DRIVER PWM DUAL 44PLCC
Manufacturer
Allegro Microsystems Inc
Specifications of UDQ2916EB
Applications
DC Motor Driver, Stepper Motor Driver
Number Of Outputs
2/1
Current - Output
±750mA
Voltage - Load
10 V ~ 45 V
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
44-LCC (J-Lead)
Operating Current
25mA
Operating Temperature Classification
Industrial
Package Type
PLCC
Operating Supply Voltage (min)
4.75V
Operating Supply Voltage (max)
5.25V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UDQ2916EB
Manufacturer:
SILICON
Quantity:
1 001
Company:
Part Number:
UDQ2916EB
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
10 000
Company:
Part Number:
UDQ2916EB-2
Manufacturer:
ALLEGRO
Quantity:
113
Company:
Part Number:
UDQ2916EB-2
Manufacturer:
PDI
Quantity:
2 500
Part Number:
UDQ2916EBT
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Company:
Part Number:
UDQ2916EBTR
Manufacturer:
Allegro MicroSystems, LLC
Quantity:
10 000
Part Number:
UDQ2916EBTR-T
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
2916
PWM CURRENT CONTROL
The UDx2916 dual bridges drive both windings of a bipolar
stepper motor. Output current is sensed and controlled
independently in each bridge by an external sense resistor, R
internal comparator, and monostable multivibrator.
When the bridge is turned on, current increases in the motor
winding and it is sensed by the external sense resistor until the
sense voltage, V
input:
The comparator then triggers the monostable, which turns off
the source driver of the bridge.
The actual load current peak will be slightly higher than the
trip point (especially for low-inductance loads) because of the
internal logic and switching delays. This delay, t
2 μs. After turn-off, the motor current decays, circulating
through the ground-clamp diode and sink transistor. The
source driver off-time (and therefore the magnitude of the
current decrease) is determined by the external RC timing
components of the monostable:
where:
The fi xed off-time should be short enough to keep the current
chopping above the audible range (< 46 μs) and long enough
to properly regulate the current. Because only slow-decay
current control is available, short off times (< 10 μs) require
additional efforts to ensure proper current regulation. Factors
that can negatively affect the ability to properly regulate the
current when using short off times include: higher motor-
supply voltage, light load, and longer than necessary blank
time.
When the source driver is re-enabled, the winding current (the
sense voltage) is again allowed to rise to the comparator’s
threshold. This cycle repeats itself, maintaining the average
motor winding current at the desired level.
Loads with high distributed capacitances may result in high
turn-on current peaks. This peak (appearing across R
attempt to trip the comparator, resulting in erroneous current
control or high-frequency oscillations. An external R
time delay should be used to further delay the action of the
comparator. Depending on load type, many applications will
not require these external components (SENSE connected to E).
R
C
T
T
= 20 to 100 kΩ, and
= 100 to 1000 pF.
SENSE
I
, reaches the level set at the comparator
TRIP
t
off
= V
= R
REF
T
C
/10 R
T
S
APPLICATIONS INFORMATION
d
, is typically
S
C
) will
C
C
S
,
V
I
OUT
P HAS E
Dual Full-Bridge Motor Driver
+
0
–
PWM OUTPUT CURRENT WAVE FORM
LOAD CURRENT PATHS
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 (508) 853-
5000
www.allegromicro.com
R S
t
d
V
B B
B R IDG E ON
S OUR C E OF F
ALL OF F
t
I
off
T R IP
Dwg. E P -006-1
Dwg. WM-003-1A
5