UDN2916B.pdf
Transcript of UDN2916B.pdf
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DUAL FULL-BRIDGE
PWM MOTOR DRIVERThe UDN2916B, UDN2916EB, and UDN2916LB motor drivers are
designed to drive both windings of a bipolar stepper motor orbidirectionally control two dc motors. Both bridges are capable ofsustaining 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 Vtotal source plus sink at 500 mA).
For PWM current control, the maximum output current is deter-mined by the users selection of a reference voltage and sensingresistor. 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 forprotection against inductive transients. Internally generated delaysprevent cross-over currents when switching current direction. Specialpower-up sequencing is not required. Thermal protection circuitrydisables the outputs if the chip temperature exceeds safe operatinglimits.
The UDN2916B is supplied in a 24-pin dual in-line plastic batwingpackage with a copper lead-frame and heat sinkable tabs for improvedpower dissipation capabilities. The UDN2916EB is supplied in a 44-leapower PLCC for surface mount applications. The UDN2916LB issupplied in a 24-lead surface-mountable SOIC. Their batwing construction provides for maximum package power dissipation in the smallest
possible construction. The UDN2916B/EB/LB are available for opera-tion from -40C to +85C. To order, change the prefix from 'UDN' to'UDQ'. These devices are also available on special order for operationto +105C. The B and LB packages are available in a lead (Pb) freeversion, with 100% matte tin leadframe.
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, UC3770Always order by complete part number:
Part Number Package
UDN2916B 24-Pin DIP
UDN2916B-T 24-Pin DIP, Lead-free
UDN2916EB 44-Lead PLCC
UDN2916LB 24-Lead SOIC
UDN2916LB-T 24-Lead SOIC, Lead-free
UDN2916B(DIP)
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
1312
11
10
9
2
1
VCC
2
V BB
1
GROUND
GROUND GROUND
GROUND
02I
12I
PH A S E 2
V R E F 2
2R C
1R C
VR E F 1
PH A S E 1
11I
2BOU T
S E N S E 2
2E
2AOU T
1AOU T
1E
S E N S E 1
1BOU T
01I
LOAD
S U PPL Y
LOGIC
S U PPL Y
Dwg. PP-005
PWM
1
PWM
2
29319.20G
ABSOLUTE MAXIMUM RATINGS
at TJ
150C
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 VCC
+0.3 V
Output Emitter Voltage, VE
.................. 1.5 V
Package Power Dissipation,
PD ........................................................ See GraphOperating Temperature Range,
TA
................................. -20C to +85C
Storage Temperature Range,
TS
............................... -55C to +150C
Output current rating may be limited by dutycycle, ambient temperature, and heat sinking.Under any set of conditions, do not exceed thespecified peak current rating or a junctiontemperature of +150C.
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
2
VREF2
GND
GND
GND
GND
6 5 4 3 2 144
43
42
41
40
7
8
9
10
11
12
13
14
15
16
17 29
30
39
38
37
36
35
34
33
32
31
28
27
26
25
24
23
22
21
20
19
18
Dwg. PP-006A
1
2
PWM 1
PWM 2
LOGICSUPPLY
OUT1A
E1
SENSE1
I01
VREF1
PHASE1
1
RC1
I11
OUT1B
LOADSUPPLY
E2
OUT2A
I02
SENSE2
PHASE2
2
RC2
I12
OUT2B
VCC
VBB
NOCONNECTION
NOCONNECTION
NC NC
VREF
Dwg. EP-007B
VBB
SENSE ONESHOT
SOURCEDISABLE
RC
+
I 0
I1
10
E
OUTA
OUTB
'B' PACKAGE,CHANNEL 1PIN NUMBERSSHOWN.
RC
RSR
TCC
CT
24
20 k
40 k10 k
211
23
22
14
20
17
15
UDN2916EB(PLCC)
VBB
24
23
22
21
20
19
18
17
16
15
14
13
GROUND
GROUND
2BOUT
SENSE 2
2E
2AOUT
1AOUT
1E
SENSE 1
1BOUT
01I
LOAD SUPPLY
Dwg. PP-047
1
2
3
4
5
6
7
8
9
12
11
10
9
GROUND
GROUND
02I
12I
PHASE 2
VREF 2
2RC
VCC
1RC
VREF 1
PHASE1
11I
LOGIC SUPPLY
PWM2
PWM1
1
22
1
UDN2916LB(SOIC) PWM CURRENT-CONTROL CIRCUITRY
50 75 100 125 150
5
1
0
ALLOWABLEPACKA
GEPOWERDISSIPATIONINWATTS
TEMPERATURE IN C
4
3
2
25
Dwg. GP-035B
R = 6.0C/W
SUFFIX 'B', R = 40C/W
SUFFIX 'LB', R = 77C/W
SUFFIX 'EB', R = 30C/W
JT
JA
JA
JA
TRUTH TABLE
PHASE OUTA
OUTB
H H L
L L H
Copyright 1994, 2003 Allegro MicroSystems, Inc.
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2916
DUAL FULL-BRIDGE
MOTOR DRIVER
www.allegromicro.com
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Drivers (OUTAor OUT
B)
Motor Supply Range VBB
10 45 V
Output Leakage Current ICEX
VOUT
= VBB
< 1.0 50 A
VOUT
= 0
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
4
APPLICATIONS INFORMATION
PWM CURRENT CONTROL
The UDN2916B/EB/LB dual bridges are designed todrive both windings of a bipolar stepper motor. Outputcurrent is sensed and controlled independently in eachbridge by an external sense resistor (R
S), internal com-
parator, and monostable multivibrator.
When the bridge is turned ON, current increases inthe motor winding and it is sensed by the external senseresistor until the sense voltage (V
SENSE) reaches the level
set at the comparators input:
ITRIP
= VREF
/10 RS
The comparator then triggers the monostable whichturns OFF the source driver of the bridge. The actualload current peak will be slightly higher than the trip point(especially for low-inductance loads) because of theinternal logic and switching delays. This delay (t
d) is
typically 2 s. After turn-off, the motor current decays,circulating through the ground-clamp diode and sinktransistor. The source drivers OFF time (and thereforethe magnitude of the current decrease) is determined bythe monostables external RC timing components, wheretoff
= RTC
Twithin the range of 20 kto 100 kand
100 pF to 1000 pF.
The fixed-off time should be short enough to keep
the current chopping above the audible range (< 46 s)and long enough to properly regulate the current. Be-cause only slow-decay current control is available, shortoff times (< 10 s) require additional efforts to ensureproper current regulation. Factors that can negativelyaffect the ability to properly regulate the current whenusing short off times include: higher motor-supply volt-age, light load, and longer than necessary blank time.
When the source driver is re-enabled, the windingcurrent (the sense voltage) is again allowed to rise to thecomparators threshold. This cycle repeats itself, main-taining the average motor winding current at the desiredlevel.
Loads with high distributed capaci-tances mayresult 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-frequencyoscillations. An external R
CC
Ctime delay should be used
to further delay the action of the comparator. Dependingon load type, many applications will not require theseexternal components (SENSE connected to E).
PWM OUTPUT CURRENT WAVE FORM
LOAD CURRENT PATHS
+
0
Dwg. WM-003-1A
V P HA S E
IOUT
td toff
ITR IP
Dwg. EP -006-1
R S
B BV
B RI D GE ON
S O U R C E O F F
ALL OFF
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2916
DUAL FULL-BRIDGE
MOTOR DRIVER
www.allegromicro.com
LOGIC CONTROL OF OUTPUT CURRENT
Two logic level inputs (l0and I
1) allow digital selection of the motor
winding current at 100%, 67%, 33%, or 0% of the maximum level perthe table. The 0% output current condition turns OFF all drivers in thebridge and can be used as an OUTPUT ENABLE function.
CURRENT-CONTROL TRUTH TABLE
l0
I1
Output Current
L L VREF
/10 RS= I
TRIP
H L VREF
/15 RS= 2/3 I
TRIP
L H VREF
/30 RS= 1/3 I
TRIP
H H 0
These logic level inputs greatly enhance the implementation ofP-controlled drive formats.
During half-step operations, the l0and l
1allow the P to control the
motor at a constant torque between all positions in an eight-step
TYPICAL APPLICATION
sequence. This is accomplished by digitally
selecting 100% drive current when only onephase is ON and 67% drive current when twphases are ON. Logic highs on both l
0and l
1
turn OFF all drivers to allow rapid currentdecay when switching phases. This helps toensure proper motor operation at high steprates.
The logic control inputs can also beused to select a reduced current level (andreduced power dissipation) for hold condi-tions and/or increased current (and availabletorque) for start-up conditions.
GENERAL
The PHASE input to each bridgedetermines the direction motor windingcurrent flows. An internally generateddeadtime (approximately 2 s) preventscrossover currents that can occur whenswitching the PHASE input.
All four drivers in the bridge output canbe turned OFF between steps (l
0= l
1 2.4 V
resulting in a fast current decay through theinternal output clamp and flyback diodes. Thfast current decay is desirable in half-step a
high-speed applications. The PHASE, l0,andinputs float high.
Varying the reference voltage (VREF
)provides continuous control of the peak loadcurrent for micro-stepping applications.
Thermal protection circuitry turns OFFall drivers when the junction temperaturereaches +170C. It is only intended to protecthe device from failures due to excessive
junction temperature and should not implythat output short circuits are permitted. Theoutput drivers are re-enabled when the
junction temperature cools to +145C.
The UDN2916B/EB/LB output driversare optimized for low output saturationvoltagesless than 1.8 V total (source plussink) at 500 mA. Under normal operatingconditions, when combined with the excellenthermal properties of the batwing packagedesign, this allows continuous operation ofboth bridges simultaneously at 500 mA.
FROMP
VREF
Dwg. EP-008B1
VBB
FROMP
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
1312
11
10
9
2
VCC
2
VBB
1
VREF
+5 V
STEPPERMOTOR
RS
RS
RC
RC
RTC
T
CC
CC
+
PWM
1
PWM2
1
820 pF 56 k
CT
820 pF56 kR
T
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
6
UDN2916B
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
NOTES:1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendors option within limits shown.
0.0140.008
0.300BSC
Dwg. MA-001-25A in
0.430MAX
24
1 6 12
0.280
0.240
0.210MAX
0.0700.045
0.015MIN
0.0220.014
0.100BSC
0.005MIN
0.1500.115
13
1.280
1.230
NOTE 1
7
0.3550.204
7.62BSC
Dwg. MA-001-25A mm
10.92MAX
24
1 12
7.116.10
5.33MAX
1.771.15
0.39MIN
0.558
0.356
2.54BSC
0.13MIN
3.812.93
13
32.5131.24
NOTE 1
6 7
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2916
DUAL FULL-BRIDGE
MOTOR DRIVER
www.allegromicro.com
UDN2916EB
Dwg. MA-005-44A mm
17.6517.40
0.51MIN
4.574.20
17.6517.40
16.66216.510
1.27BSC
0.8120.661
144
0.5330.331
INDEX AREA
2
28
29
39
40 6
7
17
18
16.66216.510
8.107.39
8.107.39
1828
Dwg. MA-005-44A in
0.020MIN
0.050
BSC
144
0.0210.013
INDEX AREA
2 6
7
1729
39
40
0.6950.685
0.0320.026
0.3190.291
0.3190.291
0.1800.165
0.6950.685
0.6560.650
0.6560.650
Dimensions in Millimeters
(for reference only)
Dimensions in Inches
(controlling dimensions)
OTES: 1. MO-047AC except for terminal shoulder height. Intended to meet new JEDEC Standard when that is approved.
2. Webbed lead frame. Leads 7-17 and 29-39 are internally one piece.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendors option within limits shown.
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8/10/2019 UDN2916B.pdf
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115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2916
DUAL FULL-BRIDGE
MOTOR DRIVER
8
UDN2916LB
0TO81
24
2 3
7.607.40
15.6015.20
10.6510.00
0.510.33
2.652.35
0.10 MIN.
0.320.23
1.27BSC
NOTE 1NOTE 3
1.270.40
Dwg. MA-008-25A mm
0TO 81
24 13
2 3
0.29920.2914
0.61410.5985
0.4190.394
0.0200.013
0.09260.1043
0.0040 MIN.
0.01250.0091
Dwg. MA-008-25A in
0.050BSC
NOTE 1NOTE 3
0.0500.016
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the design of its products.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties which may result from its use.
Dimensions in Millimeters
(controlling dimensions)
Dimensions in Inches
(for reference only)
NOTES:1. Webbed lead frame. Leads indicated are internally
one piece.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendors option
within limits shown.