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.

2916

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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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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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DUAL FULL-BRIDGE

MOTOR DRIVER


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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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


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





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.


4. Exact body and lead configuration at vendors option within limits shown.

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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.





NOTES:1. Webbed lead frame. Leads indicated are internally

one piece.


3. Exact body and lead configuration at vendors option

within limits shown.

udn2916b.pdf

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