ud n motor driver

Using PWM to minimize power dissipation and maximize loadefficiency, the UDN2962W dual driver is recommended for impactprinter solenoids and stepper motors. It is comprised of two source/sink driver pairs rated for continuous operation to 3 A. It can beconnected to drive two independent loads or a single load in the full-bridge configuration. Both drivers include output clamp/flybackdiodes, input gain and level shifting, a voltage regulator for single-supply operation, and pulse-width modulated output-current controlcircuitry. Inputs are compatible with most TTL, DTL, LSTTL, andlow-voltage CMOS or PMOS logic.

The peak output current and hysteresis for each source/sink pair isset independently. Output current, threshold voltage, and hysteresis areset by the users selection of external resistors. At the specified output-current trip level, the source driver turns off. The internal clamp diodethen allows current to flow without additional input from the powersupply. When the lower current trip point is reached, the source driverturns back on.

The UDN2962W is in a 12-pin single in-line power-tab package.The tab is at ground potential and needs no insulation. For high-current or high-frequency applications, external heat sinking may berequired.

FEATURES

4 A Peak Output 45 V Min. Sustaining Voltage Internal Clamp Diodes TTL/PMOS/CMOS Compatible Inputs High-Speed Chopper

Dwg. No. D-1001

2962DUAL SOLENOID/MOTOR DRIVER

PULSE-WIDTH MODULATED CURRENT CONTROL

ABSOLUTE MAXIMUM RATINGSat T

J +150C

Supply Voltage, VCC . . . . . . . . . . . . . . 45 VPeak Output Current, IOUT . . . . . . . . . 4 AInput Voltage Range,

VIN . . . . . . . . . . . . . . . -0.3 V to +7.0 VPackage Power Dissipation,

PD . . . . . . . . . . . . . . . . . . . See GraphOperating Temperature Range,

TA . . . . . . . . . . . . . . . . -20C to +85CStorage Temperature Range,

TS . . . . . . . . . . . . . . . -55C to +150C

NOTE: Output current rating may be limited byduty cycle, ambient temperature, and heatsinking. Under any set of conditions, do notexceed the specified peak current and a junctiontemperature of +150C.

Always order by complete part number: UDN2962W .

THS

IN

SENSE

SINK

SOURCEB

B

B

B

B

GROUND

INA

SENSE A

SINK A

SOURCEA

THSA

VCC

LOG

IC

1211

109

87

65

43

21

LOG

IC

Data S

heet29319.12A

2962DUAL PWMSOLENOID/MOTOR DRIVER

115 Northeast Cutoff, Box 15036Worcester, Massachusetts 01615-0036 (508) 853-5000

FUNCTIONAL BLOCK DIAGRAM(ONE OF TWO DRIVERS)

Dwg. No. D-1002

TRUTH TABLE

SOURCE SINKVIN VSENSE DRIVER DRIVER

High NA Off OffLow VTHS/10 Off On

VCC

SOURCE

LOADSINK

SENSE

RS(TYP.0.1 ) VREF

RH

RT

THS-10

+

_

GND

IN

50 75 100 125 150

10

6

4

2

0

ALL

OW

ABLE

PAC

KAG

E PO

WER

DIS

SIPA

TIO

N IN

WAT

TS

TEMPERATURE IN C

8

25

R = 2.0C/W JT

Dwg. GP-012B

FREE AIR, R = 38C/WJA

3.0C/W HEAT SINKR = 5.0C/WJA

12C/W HEAT SINKR = 14C/WJA

WCopyright 1986, 2000 Allegro MicroSystems, Inc.

2962DUAL PWM

SOLENOID/MOTOR DRIVER

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at TA = +25C, T

J +150C, V

CC = 45 V, V

SENSE = 0 V (unless

otherwise noted).

LimitsCharacteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage Range VCC Operating 20 45 V

Output Drivers

Output Leakage Current ICEX VIN = 2.4 V, VSOURCE = 0 V



CIRCUIT DESCRIPTIONAND APPLICATIONS INFORMATION

The UDN2962W high-current driver is intended for use as afree-running, pulse-width modulated solenoid driver.

Circuit Description. In operation, the source and sink drivers areboth turned on by a low level at the input. The load current rises withtime as a function of the load inductance, total circuit resistance, andsupply voltage and is sensed by the external sense resistor (RS).When the load current reaches the trip point (ITRIP), the comparatoroutput goes high and turns off the source driver. The actual loadcurrent will peak slightly higher than ITRIP because of the internal logicand switching delays.

After the source driver is turned off, the load current continues tocirculate through the sink driver and an internal ground clamp diode.The rate of current decay is a function of the load inductance and totalcircuit resistance.

An internal constant current sink reduces the trip point (hysteresis)until the decaying load current reaches the lower threshold, when thecomparator output goes low and the source driver is again turned on.Load current is again allowed to rise to the trip point and the cyclerepeats.

Maximum load current and hysteresis is determined by the user.

Determining Maximum Load Current and Hysteresis. Tripcurrent (ITRIP) is determined as a function of resistance RS and thethreshold voltage, VTHS:

VTHSITRIP =10 RS

where VTHS = 10 x VSENSE = 0.6 V to 5.0 V.

Hysteresis percentage (H) is determined by resistance RH and isindependent of the load current:

RHH =50 x VREF

The chopping frequency is asynchronous and a function of thesystem and circuit parameters, including load inductance, supplyvoltage, hysteresis setting, and switching speed of the driver.

Resistance RT is determined as:RHVTHSRT =

VREF VTHS

Note that if VTHS = VREF, then RT = .

Circuit Layout. To prevent interactionbetween channels, each of the two high-levelpower ground returns (the low side of thesense resistors) must be returned independ-ently to the low-level signal ground (pin 1).The circuit common (pin 1) can then berouted to the system ground.

The printed wiring board should utilize aheavy ground plane. For optimum perform-ance, the driver should be soldered directlyinto the board.

The power supply (VCC) should bedecoupled with an electrolytic capacitor(10 F) as close as possible to pin 7.

TYPICAL WAVESHAPES

=

VIN

VSINK

VSOURCE

ILOAD

VTHS

VCC

GND

VCC

I TRIP S THS

GND

R V 10

Dwg. WP-006

3 7 10

+RS

RSSY

STEM

GRO

UND

SUPPLY

Dwg. OP-001

1

2962DUAL PWM



APPLICATIONS INFORMATION

RESISTOR RH VALUE

AS A FUNCTION OF HYSTERESISRESISTOR R

T VALUE

AS A FUNCTION OF PEAK LOAD CURRENT

Dwg. No. A-12,417 Dwg. No. A-12,416

Dwg. No. D-1004

25

20

15

10

5

00

RIN

kH

20 40 60 80 100HYSTERESIS, H, IN PERCENT

V = 5 VREF

NOTE: Each of the drivers includes an internal logic delay to preventpotentially destructive crossover currents within the driver during phasechanges. However, never simultaneously enable both inputs in the full-bridge configurations: A destructive short-circuit to ground will result.

RH AND RT DETERMINE HYSTERESIS AND PEAK CURRENT

25

20

15

10

5

00

RIN

kT

3.01.0 2.5 3.5 4.0LOAD CURRENT, I , IN AMPERES

0.5 1.5 2.0

MAX

H=25%

H=20%

H=15%

H=10%

H=5%

V = 5VREFSR = 0.1



Dimensions in Inches(controlling dimensions)

Dwg. MP-007 in

1.2601.240

0.7750.7650.020

0.1550.145

0.180MAX

0.0550.045

0.1350.100

0.290 MIN

0.0800.070

0.365

0.1000.010

0.0300.020

0.0650.035

1 0.0230.018

0.140

0.5700.540

0.2450.225

12

INDEXAREA

NOTES: 1. Lead thickness is measured at seating plane or below.2. Lead spacing tolerance is non-cumulative.3. Exact body and lead configuration at vendors option within limits shown.4. Lead gauge plane is 0.030 below seating plane.5. Supplied in standard sticks/tubes of 15 devices.

2962DUAL PWM



Dimensions in Millimeters(for reference only)

Dwg. MP-007 mm

32.0031.49

19.6919.45

0.513.943.68

4.57MAX

1.401.14

3.432.54

7.36 MIN

2.031.77

9.27

2.540.254

0.760.51

1.650.89

1 0.590.45

3.56

14.4813.71

6.225.71

12

INDEXAREA

The products described here are manufactured under one or more U.S.patents or U.S. patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to time,such departures from the detail specifications as may be required to permitimprovements in the performance, reliability, or manufacturability of itsproducts. Before placing an order, the user is cautioned to verify that theinformation being relied upon is current.

Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.

The information included herein is believed to be accurate and reliable.However, Allegro MicroSystems, Inc. assumes no responsibility for its use; norfor any infringement of patents or other rights of third parties which may resultfrom its use.

NOTES: 1. Lead thickness is measured at seating plane or below.2. Lead spacing tolerance is non-cumulative.3. Exact body and lead configuration at vendors option within limits shown.4. Lead gauge plane is 0.762 mm below seating plane.5. Supplied in standard sticks/tubes of 15 devices.



MOTOR DRIVERSFunction Output Ratings* Part Number

INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS3-Phase Power MOSFET Controller 28 V 39333-Phase Power MOSFET Controller 50 V 39323-Phase Power MOSFET Controller 50 V 76002-Phase Hall-Effect Sensor/Driver 400 mA 26 V 3626Bidirectional 3-Phase Back-EMF Controller/Driver 600 mA 14 V 89062-Phase Hall-Effect Sensor/Driver 900 mA 14 V 36253-Phase Back-EMF Controller/Driver 900 mA 14 V 8902A3-Phase Controller/Drivers 2.0 A 45 V 2936 & 2936-120

INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORSDual Full Bridge with Protection & Diagnostics 500 mA 30 V 3976PWM Current-Controlled Dual Full Bridge 650 mA 30 V 3966PWM Current-Controlled Dual Full Bridge 650 mA 30 V 3968PWM Current-Controlled Dual Full Bridge 750 mA 45 V 2916PWM Current-Controlled Dual Full Bridge 750 mA 45 V 2919PWM Current-Controlled Dual Full Bridge 750 mA 45 V 6219PWM Current-Controlled Dual Full Bridge 800 mA 33 V 3964PWM Current-Controlled Full Bridge 1.3 A 50 V 3953PWM Current-Controlled Dual Full Bridge 1.5 A 45 V 2917PWM Current-Controlled Microstepping Full Bridge 1.5 A 50 V 3955PWM Current-Controlled Microstepping Full Bridge 1.5 A 50 V 3957PWM Current-Controlled Dual DMOS Full Bridge 1.5 A 50 V 3972Dual Full-Bridge Driver 2.0 A 50 V 2998PWM Current-Controlled Full Bridge 2.0 A 50 V 3952DMOS Full Bridge PWM Driver 2.0 A 50 V 3958Dual DMOS Full Bridge 2.5 A 50 V 3971

UNIPOLAR STEPPER MOTOR & OTHER DRIVERSVoice-Coil Motor Driver 500 mA 6 V 8932AVoice-Coil Motor Driver 800 mA 16 V 8958Unipolar Stepper-Motor Quad Drivers 1 A 46 V 7024 & 7029Unipolar Microstepper-Motor Quad Driver 1.2 A 46 V 7042Unipolar Stepper-Motor Translator/Driver 1.25 A 50 V 5804Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2540Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2544Unipolar Stepper-Motor Quad Driver 3 A 46 V 7026

Unipolar Microstepper-Motor Quad Driver 3 A 46 V 7044

* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits orover-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output.

Complete part number includes additional characters to indicate operating temperature range and package style.Also, see 3175, 3177, 3235, and 3275 Hall-effect sensors for use with brushless dc motors.

This datasheet has been downloaded from:

www.DatasheetCatalog.com

Datasheets for electronic components.

ud n motor driver

Documents