2916
UDN2916B
(DIP)
OUT
1A
OUT
2A
E
2
S E NS E
2
OUT
2B
G R OUND
G R OUND
I
02
I
12
P HAS E
2
V
REF 2
RC
2
1
2
3
4
5
6
7
8
P WM 1
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
V
BB
LOAD
S UP P LY
E
1
S E NS E
1
OUT
1B
I
01
G R OUND
G R OUND
I
11
P HAS E
1
V
REF 1
RC
1
LOG IC
S UP P LY
24
23
1
2
22
21
20
19
18
17
θ
1
16
15
14
V
CC
13
The UDN2916B, UDN2916EB, and UDN2916LB motor drivers are
designed to drive both windings of a bipolar stepper motor or
bidirectionally control two dc motors. Both bridges are capable of
sustaining 45 V and include internal pulse-width modulation (PWM)
control of the output current to 750 mA. The outputs have been opti-
mized for a low output saturation voltage drop (less than 1.8 V
total source plus sink at 500 mA).
For PWM current control, the maximum output current is deter-
mined by the user’s selection of a reference voltage and sensing
resistor. Two logic-level inputs select output current limits of 0, 33,
67, or 100% of the maximum level. A PHASE input to each bridge
determines load current direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction. Special
power-up sequencing is not required. Thermal protection circuitry
disables the outputs if the chip temperature exceeds safe operating
limits.
The UDN2916B is supplied in a 24-pin dual in-line plastic batwing
package with a copper lead-frame and heat sinkable tabs for improved
power dissipation capabilities. The UDN2916EB is supplied in a 44-
lead power PLCC for surface mount applications. The UDN2916LB is
supplied in a 24-lead surface-mountable SOIC. Their batwing construc-
tion provides for maximum package power dissipation in the smallest
possible construction. The UDN2916B, UDN2916EB, and UDN2916LB
are available for operation from –20°C to 85°C. The UDQ2916B and
UDQ2916LB are available for operation from –40°C to 105°C. All
packages are lead (Pb) free, with 100% matte tin leadframe.
Data Sheet
29319.20L
9
9
10
11
12
θ
2
P WM 2
Dwg. P P -005
ABSOLUTE MAXIMUM RATINGS
at T
J
≤
150°C
Motor Supply Voltage, V
BB
....................
45 V
Output Current, I
OUT
(Peak) ........................................
+1.0 A
(Continuous) ..........................
+750 mA
Logic Supply Voltage, V
CC
...................
7.0 V
Logic Input Voltage Range,
V
IN
.........................
-0.3 V to V
CC
+0.3 V
Output Emitter Voltage, V
E
..................
1.5 V
Package Power Dissipation,
P
D ........................................................
See Graph
Operating Temperature Range,
T
A
.................................
-20°C to +85°C
Storage Temperature Range,
T
S
...............................
-55°C to +150°C
Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified peak current rating or a junction
temperature of +150°C.
FEATURES
■
■
■
■
■
■
■
750 mA Continuous Output Current
45 V Output Sustaining Voltage
Internal Clamp Diodes
Internal PWM Current Control
Low Output Saturation Voltage
Internal Thermal Shutdown Circuitry
Similar to Dual PBL3717, UC3770
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
Selection Guide
Part Number
Pb-free
*
Package
Packing
Ambient
Temperature
(°C)
–20 to 85
–40 to 105
–20 to 85
–20 to 85
–20 to 85
–20 to 85
–40 to 105
UDN2916B-T
UDQ2916B-T
UDN2916EB-T
UDN2916EBTR-T
UDN2916LB-T
UDN2916LBTR-T
UDQ2916LBTR-T
*
Yes
Yes
Yes
Yes
Yes
Yes
Yes
24-Pin DIP
24-Pin DIP
44-Lead PLCC
44-Lead PLCC
24-Lead SOIC
24-Lead SOIC
24-Lead SOIC
15 per tube
15 per tube
17 per tube
450 per reel
31 per tube
1000 per reel
1000 per reel
Pb-based variants are being phased out of the product line. The variants cited in this footnote are in
production but have been determined to be LAST TIME BUY. This classification indicates that sale
of this device is currently restricted to existing customer applications. The variants should not be
purchased for new design applications because obsolescence in the near future is probable.
Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST
TIME BUY orders: April 27, 2007. These variants include: UDN2916B, UDQ2916EB, UDN2916EB,
UDQ2916EBTR, UDN2916EBTR, UDN2916LB, UDQ2916LB, UDQ2916LBTR, and UDN2916LBTR.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
UDN2916EB
(PLCC)
LOGIC SUPPLY
LOAD SUPPLY
5
SENSE
1
PHASE
1
OUT
1A
OUT
1B
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
V
REF 1
43
42
41
RC
1
E
I
01
I
11
R
JT
= 6.0°C/W
1
44
40
6
5
4
3
2
1
1
V
CC
39
GND
4
SUFFIX 'EB', R
JA
= 30°C/W
JA
GND
7
8
V
BB
PWM 1
SUFFIX 'B', R
= 40°C/W
38
37
36
35
34
33
9
10
11
12
13
14
15
16
GND
17
NC
NO CONNECTION
19
21
OUT
2A
18
E
2
20
3
1
2
2
32
31
30
29
NC
NO CONNECTION
22
OUT
2B
23
I
02
24
I
12
25
2
1
SUFFIX 'LB', R
JA
= 55°C/W*
PWM 2
GND
0
26
27
SENSE
2
V
REF 2
PHASE
2
RC
2
28
25
50
75
100
TEMPERATURE IN °C
125
150
Dwg. GP-035B
Dwg. PP-006A
*Measured on a single-layer board, with 1 sq. in. of 2 oz copper area.
For additional information, refer to the Allegro Web site.
UDN2916LB
(SOIC)
'B' PACKAGE,
CHANNEL 1
PIN NUMBERS
SHOWN.
PWM CURRENT-CONTROL CIRCUITRY
V
BB
24
I
02
1
PWM 2
24
23
22
2
21
20
19
V
BB
LOAD SUPPLY
OUT
2B
SENSE
2
E
2
OUT
2A
GROUND
GROUND
OUT
1A
E
1
SENSE
1
OUT
1B
I
01
I
12
PHASE
2
V
REF 2
RC
2
GROUND
GROUND
LOGIC SUPPLY
RC
1
V
REF 1
PHASE
1
I
11
2
3
4
5
6
7
8
9
9
V
CC
2
1
OUT B
21
OUT A
V
REF
15
20 k
10
40 k
I
0
20
I
1
17
10 k
R
S
23
E
SENSE
–
RC
22
+
ONE
SHOT
14
RC
SOURCE
DISABLE
18
17
16
1
15
CC
R
T
C
T
10
PWM 1
Dwg. EP-007B
11
12
1
14
13
TRUTH TABLE
PHASE
OUT
A
H
L
OUT
B
L
H
H
L
Dwg. PP-047
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1994, 2003, 2007 Allegro MicroSystems, Inc.
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at T
A
= +25°C, T
J
≤
150°C, V
BB
= 45 V, V
CC
= 4.75 V to 5.25 V,
V
REF
= 5.0 V (unless otherwise noted).
Limits
Characteristic
Output Drivers (OUT
A
or OUT
B
)
Motor Supply Range
Output Leakage Current
V
BB
I
CEX
V
OUT
= V
BB
V
OUT
= 0
Output Sustaining Voltage
Output Saturation Voltage
V
CE(sus)
V
CE(SAT)
I
OUT
= ±750 mA, L = 3.0 mH
Sink Driver, I
OUT
= +500 mA
Sink Driver, I
OUT
= +750 mA
Source Driver, I
OUT
= –500 mA
Source Driver, I
OUT
= –750 mA
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
Driver Supply Current
I
R
V
F
I
BB(ON)
I
BB(OFF)
Control Logic
Input Voltage
V
IN(1)
V
IN(0)
Input Current
I
IN(1)
All inputs
All inputs
V
IN
= 2.4 V
V
IN
= 0.8 V
Reference Voltage Range
Current Limit Threshold
(at trip point)
V
REF
V
REF
/ V
SENSE
Operating
I
0
= I
1
= 0.8 V
I
0
= 2.4 V, I
1
= 0.8 V
I
0
= 0.8 V, I
1
= 2.4 V
Thermal Shutdown Temperature
Total Logic Supply Current
T
J
I
CC(ON)
I
CC(OFF)
Fixed Off-Time
t
off
I
0
= I
1
= 0.8 V, No Load
I
0
= I
1
= 2.4 V, No Load
R
T
= 56 kΩ, C
T
= 820 pF
2.4
—
—
—
1.5
9.5
13.5
25.5
—
—
—
—
—
—
<1.0
– 3.0
—
10
15
30
170
40
10
46
—
0.8
20
–200
7.5
10.5
16.5
34.5
—
50
12
—
V
V
µA
µA
V
—
—
—
°C
mA
mA
µs
V
R
= 45 V
I
F
= 750 mA
Both Bridges ON, No Load
Both Bridges OFF
10
—
—
45
—
—
—
—
—
—
—
—
—
< 1.0
<–1.0
—
0.4
1.0
1.0
1.3
< 1.0
1.6
20
5.0
45
50
–50
—
0.6
1.2
1.2
1.5
50
2.0
25
10
V
µA
µA
V
V
V
V
V
µA
V
mA
mA
Symbol
Test Conditions
Min.
Typ.
Max.
Units
www.allegromicro.com
3
2916
DUALFULL -BRIDGE
MOTORDRIVER
APPLICATIONS INFORMATION
PWM CURRENT CONTROL
The UDN2916B/EB/LB dual bridges are designed to
drive both windings of a bipolar stepper motor. Output
current is sensed and controlled independently in each
bridge by an external sense resistor (R
S
), internal com-
parator, 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
SENSE
) reaches the level
set at the comparator’s input:
I
TRIP
= V
REF
/ 10 R
S
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
d
) is
typically 2 µs. After turn-o , the motor current decays,
circulating through the ground-clamp diode and sink
transistor. The source driver’s OFF time (and therefore
the magnitude of the current decrease) is determined by
the monostable’s external RC timing components, where
t
o
= R
T
C
T
within the range of 20 k
Ω
to 100 k
Ω
and
100 pF to 1000 pF.
The xed-o time should be short enough to keep
the current chopping above the audible range (< 46 µs)
and long enough to properly regulate the current. Be-
cause only slow-decay current control is available, short
o times (< 10 µs) require additional e orts to ensure
proper current regulation. Factors that can negatively
a ect the ability to properly regulate the current when
using short o times include: higher motor-supply volt-
age, 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, main-
taining the average motor winding current at the desired
level.
Loads with high distributed capaci-tances may
result in high turn-ON current peaks. This peak (appear-
ing across R
S
) will attempt to trip the comparator, result-
ing in erroneous current control or high-frequency
oscillations. An external R
C
C
C
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).
PWM OUTPUT CURRENT WAVE FORM
V
P HAS E
+
I
OUT
0
–
I
T R IP
t
d
t
o
Dwg. WM-003-1A
LOAD CURRENT PATHS
V
BB
RS
B R IDG E ON
S OUR C E OF F
ALL OF F
Dwg. E P -006-1
5
115 Northeast
Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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