2 91 7
LOGIC SUPPLY
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The UDN2917EB motor driver is 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 modula-
tion (PWM) control of the output current to 1.5 A.
39
PWM 1
38
37
1
36
35
34
33
GND
Data Sheet
29319.22†
SENSE
1
PHASE
1
V
REF 1
ENABLE
1
42
OUT
1A
OUT
1B
θ
1
43
41
RC
1
E
1
I
10
I
11
44
GND
7
8
9
10
11
12
13
EN
1
V
CC
40
6
5
4
3
2
1
For PWM current control, the maximum output current is determined 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. Active-
low ENABLE inputs control the four drivers in each bridge.
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 tempera-
ture exceeds safe operating limits.
The UDN2917EB is supplied in a 44-lead power PLCC for surface-mount
applications. Its batwing construction provides for maximum package power
dissipation in the smallest possible construction. The UDN2917EB is available
for operation from -40°C to +85°C. To order, change the prefix from 'UDN' to
'UDQ'. This device is also available on special order for operation to +125°C.
14
15
16
GND
17
V
BB
2
32
31
30
29
GND
PWM 2
θ
2
PHASE
2
26
ENABLE
2
27
EN
2
RC
2
28
E
2
19
LOAD SUPPLY
22
OUT
2B
21
OUT
2A
18
SENSE
2
20
V
REF 2
25
I
20
23
I
21
24
Dwg. PP-021
Dwg. PP-021
ABSOLUTE MAXIMUM RATINGS
at T
J
≤
+150°C
Motor Supply Voltage, V
BB
....................
45 V
Output Current, I
OUT
(t
w
≤
20
µs)
.....
±
1.75 A
(Continuous) ...............................
±
1.5 A
Logic Supply Voltage, V
CC
....................
7.0 V
Logic Input Voltage Range,
V
IN
................................
-0.3 V to +7.0 V
Output Emitter Voltage, V
E
...................
1.0 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
I
1.5 A Continuous Output Current
I
45 V Output Sustaining Voltage
I
Internal Clamp Diodes
I
Digital Control of Output Current
I
Internal Thermal Shutdown Circuitry
I
Similar to Dual PBL3770
Always order by complete part number:
UDN2917EB
.
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
