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PDF 2916 Data sheet ( Hoja de datos )

Número de pieza 2916
Descripción DUAL FULL-BRIDGE PWM MOTOR DRIVER
Fabricantes Allegro MicroSystems 
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2916
UDN2916B
OUT 1A
OUT 2A
E2
SENSE 2
OUT 2B
GROUND
1
2
3
4
5
6
2
GROUND 7
I 02
I 12
PHASE 2
8
99
10 θ2
V REF 2 11
RC 2 12
VBB
24
LOAD
SUPPLY
23 E 1
1
22 SENSE 1
21 OUT 1B
20 I 01
19 GROUND
18 GROUND
17 I 11
θ1 16 PHASE 1
15 V REF 1
14
VCC 13
RC 1
LOGIC
SUPPLY
Dwg. PP-005
ABSOLUTE MAXIMUM RATINGS
at TJ 150°C
Motor Supply Voltage, VBB .................... 45 V
Output Current, IOUT
(Peak) ........................................ +1.0 A
(Continuous) .......................... +750 mA
Logic Supply Voltage, VCC ................... 7.0 V
Logic Input Voltage Range,
VIN ............................... -0.3 V to +7.0 V
Output Emitter Voltage, VE ................... 1.5 V
Package Power Dissipation,
PD ........................................................ See Graph
Operating Temperature Range,
TA ................................. -20°C to +85°C
Storage Temperature Range,
TS ............................... -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.
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
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
optimized 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 con-
struction provides for maximum package power dissipation in the
smallest possible construction. The UDN2916B/EB/LB are available for
operation from -40°C to +85°C. To order, change the prefix from 'UDN'
to 'UDQ'. These devices are also available on special order for opera-
tion to +105°C.
FEATURES
I 750 mA Continuous Output Current
I 45 V Output Sustaining Voltage
I Internal Clamp Diodes
I Internal PWM Current Control
I Low Output Saturation Voltage
I Internal Thermal Shutdown Circuitry
I Similar to Dual PBL3717, UC3770
Always order by complete part number:
Part Number Package
UDN2916B
24-Pin DIP
UDN2916EB 44-Lead PLCC
UDN2916LB 24-Lead SOIC

1 page




2916 pdf
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT
Two logic level inputs (l and I ) allow digital selection of the motor
01
winding current at 100%, 67%, 33%, or 0% of the maximum level per
the table. The 0% output current condition turns OFF all drivers in the
bridge and can be used as an OUTPUT ENABLE function.
CURRENT-CONTROL TRUTH TABLE
l0 I1 Output Current
L L VREF/10 RS = ITRIP
H L VREF/15 RS = 2/3 ITRIP
L H VREF/30 RS = 1/3 ITRIP
HH
0
These logic level inputs greatly enhance the implementation of
µP-controlled drive formats.
During
half-step
operations,
the
l
0
and
l
1
allow
the
µP
to
control
the
motor at a constant torque between all positions in an eight-step
TYPICAL APPLICATION
1
RS
RC
CC
2
3
4
5
6
2
7
FROM
µP
VREF
RT
8
99
10 θ 2
11
12
CT
STEPPER
MOTOR
VBB
1
24
23
RC
22
21
RS
CC
V
BB
+
20
19
18
17
θ1 16
15
14
VCC 13
FROM
µP
V
REF
+5 V CT RT
Dwg. EP-008B
sequence. This is accomplished by digitally
selecting 100% drive current when only one
phase is ON and 67% drive current when two
phases are ON. Logic highs on both l0 and l1
turn OFF all drivers to allow rapid current
decay when switching phases. This helps to
ensure proper motor operation at high step
rates.
The logic control inputs can also be
used to select a reduced current level (and
reduced power dissipation) for holdcondi-
tions and/or increased current (and available
torque) for start-up conditions.
GENERAL
The PHASE input to each bridge
determines the direction motor winding
current flows. An internally generated
deadtime (approximately 2 µs) prevents
crossover currents that can occur when
switching the PHASE input.
All four drivers in the bridge output can
be turned OFF between steps (l0 = l1 2.4 V)
resulting in a fast current decay through the
internal output clamp and flyback diodes. The
fast current decay is desirable in half-step and
high-speed applications. The PHASE, l0,and I1
inputs float high.
Varying the reference voltage (VREF)
provides continuous control of the peak load
current for micro-stepping applications.
Thermal protection circuitry turns OFF
all drivers when the junction temperature
reaches +170°C. It is only intended to protect
the device from failures due to excessive
junction temperature and should not imply
that output short circuits are permitted. The
output drivers are re-enabled when the
junction temperature cools to +145°C.
The UDN2916B/EB/LB output drivers
are optimized for low output saturation
voltagesless than 1.8 V total (source plus
sink) at 500 mA. Under normal operating
conditions, when combined with the excellent
thermal properties of the batwing package
design, this allows continuous operation of
both bridges simultaneously at 500 mA.

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