Datasheet UDN2917EB, UDQ2917EB Datasheet (Allegro)

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Page 1

REF 1

PWM 1

PHASE

PWM 2

REF 2

ENABLE

424140

PHASE

ENABLE

OUT

GND

17 29

OUT

SENSE

OUT

LOAD SUPPLY

ABSOLUTE MAXIMUM RATINGS

at TJ ≤ +150°C

LOGIC SUPPLY

Dwg. PP-021

GND

29319.22†

2 9 1 7

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.

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.

Data Sheet

Motor Supply Voltage, VBB.................... 45 V

Output Current, I

(tw ≤ 20 µs) ..... ±1.75 A

OUT

(Continuous) ............................... ±1.5 A

Logic Supply Voltage, V

.................... 7.0 V

Logic Input Voltage Range,

VIN................................ -0.3 V to +7.0 V

Output Emitter Voltage, V

................... 1.0 V

Package Power Dissipation,

PD......................................... See Graph

Operating Temperature Range,

.................................. -20°C to +85°C

Storage Temperature Range,

................................ -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

■ 1.5 A Continuous Output Current

■ 45 V Output Sustaining Voltage

■ Internal Clamp Diodes

■ Digital Control of Output Current

■ Internal Thermal Shutdown Circuitry

■ Similar to Dual PBL3770

Always order by complete part number: UDN2917EB .

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2917

DUAL FULL-BRIDGE PWM MOTOR DRIVER

PWM CURRENT-CONTROL CIRCUITRY

CHANNEL 1 PIN NUMBERS SHOWN.

REF

20 kΩ

OUT

12.5

7.5

÷10

40 kΩ

10 kΩ

SENSE

–

ONE

SHOT

SOURCE DISABLE

Dwg. EP-007-2A

TRUTH TABLE

θJT

Enable Phase Out

°C

LHHL LLLH

HXZZ

X = Don’t care Z = High impedance

Out

5.0

2.5

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

R = 30

°C/W

50 75 100 125 150

TEMPERATURE IN °C

Dwg. GP-020B

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

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DUAL FULL-BRIDGE

PWM MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at T

= +25°C, VBB = 45 V, VCC = 5.0 V, V

= 5.0 V (unless

REF

otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Drivers (OUT

Motor Supply Range V

Output Leakage Current I

Output Sustaining Voltage V

Output Saturation Voltage V

Clamp Diode Leakage Current I

Clamp Diode Forward Voltage V

Driver Supply Current I

Control Logic

or OUTB)

CEX

CE(sus)

CE(SAT

BB(ON)

BB(OFF)

10 — 45 V

= V

OUT

= 0 — <-1.0 -50 µA

OUT

= ±1.5 A, L = 3.5 mH 45 —— V

OUT

)

Sink Driver, I

Source Driver, I

= +1.0 A* — 0.5 0.7 V

OUT

= +1.5 A* — 0.8 1.0 V

OUT

= -1.0 A* — 1.8 1.9 V

OUT

= -1.5 A* — 1.9 2.1 V

OUT

— <1.0 50 µA

VR = 45 V — <1.0 50 µA

IF = 1.5 A — 1.6 2.0 V

Both Bridges On, No Load — 9.0 12 mA

Both Bridges Off — 4.0 6.0 mA

Input Voltage V

Input Current I

Reference Voltage Range V

Current Limit Threshold V (at trip point)

Thermal Shutdown Temp. T

Total Logic Supply Current I

IN(1)

IN(0)

IN(1)

IN(0)

REF

REF/VSENSE

CC(ON)

CC(OFF)

All Inputs 2.4 —— V

All Inputs ——0.8 V

= 2.4 V — <1.0 20 µA

VIN = 0.8 V — -3.0 -200 µA

Operating 1.5 — 7.5 V

I0 = I1 = 0.8 V 9.5 10 10.5 —

= 2.4 V, I1= 0.8 V 13.5 15 16.5 —

= 0.8 V, I1 = 2.4 V 25.5 30 34.5 —

I0 = I1 = VEN = 0.8 V, No Load — 90 105 mA

I0 = I1 = 2.4 V, No Load — 10 12 mA

Negative current is defined as coming out of (sourcing) the specified device pin.

Typical Data is for design information only.

* Pulse test (<10 ms).

www.allegromicro.com

— 170 — °C

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DUAL FULL-BRIDGE PWM MOTOR DRIVER

APPLICATIONS INFORMATION

PWM CURRENT CONTROL

The UDN2917EB dual bridge is designed to drive both windings of a bipolar stepper motor. Output current is sensed and controlled independently in each bridge by an external sense resistor (R parator, and monostable multivibrator.

), internal com-

PWM OUTPUT CURRENT WAVEFORM

PHASE

When the bridge is turned on, current increases in the motor winding and it is sensed by the external sense resistor until the sense voltage (V

) reaches the level set

SENSE

at the comparator’s input:

TRIP

= V

REF

/10 R

The comparator then triggers the monostable which turns off the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) because of the internal logic and switching delays. This delay (td) is typically 2 µs. After turn-off, the motor current will normally decay, circulating through the ground clamp diode and sink transistor. The source driver’s off time (and therefore the magnitude of the current decrease) is determined by the monostable’s external RC timing components, where t

off

RTCT within the range of 20 kΩ to 100 kΩ and 200 pF to 500 pF.

When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to the comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level.

OUT

–

TRIP

off

Dwg. WM-003-1A

LOAD CURRENT PATHS

Special circuitry has been included to prevent runaway current control when the fixed off time (t

) is set too short. This

off

circuitry prevents the source driver from being re-enabled until the load current has decayed to below the I

TRIP

level.

BRIDGE ON SOURCE OFF ALL OFF

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

Dwg. EP-006-1

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DUAL FULL-BRIDGE

PWM MOTOR DRIVER

CURRENT-CONTROL

TRUTH TABLE

LLV

HLV

LHV

HH 0

Output Current

/10 RS = I

REF

/15 RS = 2/3 I

REF

/30 RS = 1/3 I

REF

TRIP

Loads with high distributed capacitances may result in high turn-on current peaks. This peak (appearing across RS) will attempt to trip the comparator, resulting in erroneous current control or high-frequency oscillations. An external RCCC low-pass filter may be needed to delay the action of the comparator.

LOGIC CONTROL OF OUTPUT CURRENT

Two logic level inputs (I0 and I1) allow digital selection of the motor 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. These logic level inputs greatly enhance the implementation of µP-controlled drive formats.

During half-step operations, the I0 and I1 inputs allow the µP to control the motor at a constant torque between all positions in an eightstep 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.

The logic control inputs can also be used to select a reduced current level (and reduced power dissipation) for ‘hold’ conditions and/or increased current (and available torque) for start-up conditions.

GENERAL

To avoid excessive voltage spikes on the LOAD SUPPLY pin (VBB), a large-value capacitor (≥47 µF) should be connected from V

to ground as close as possible to the device. Under no circumstances should the voltage at LOAD SUPPLY exceed 45 V.

The PHASE input to each bridge determines the direction motor winding current flows. An internally generated deadtime (approximately 3 µs) prevents crossover currents that can occur when switching the PHASE input.

All four drivers in the bridge output can be turned off (VEN ≥ 2.4 V or I0 = I1 ≥ 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. All logic inputs float high; the ENABLE input must be tied low if it is not used.

Varying the reference voltage (V

) provides continuous control

REF

of the peak load current for micro-stepping applications, within the specified limits for V

REF

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.

www.allegromicro.com

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DUAL FULL-BRIDGE PWM MOTOR DRIVER

UDN2917EB

Dimensions in Inches

(controlling dimensions)

0.319

0.291

0.319

0.291

8.10

7.39

8.10

7.39

0.021

0.013

0.050

BSC

0.533

0.331

1.27

BSC

0.020

MIN

0.180

0.165

0.032

0.026

0.695

0.685

0.656

0.650

Dimensions in Millimeters

(for reference only)

0.812

0.661

17.65

17.40

16.662

16.510

0.656

0.650

144

0.695

0.685

INDEX AREA

Dwg. MA-005-44A in

0.51

MIN

4.57

4.20

NOTES: 1. MO-047AC except for terminal shoulder height.

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 vendor’s option within limits shown.

5. Supplied in standard sticks/tubes of 27 devices or add “TR” to part number for tape and reel.

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

144

17.65

17.40

Dwg. MA-005-44A mm

16.662

16.510

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DUAL FULL-BRIDGE

PWM MOTOR DRIVER

www.allegromicro.com

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 permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information 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; nor for any infringement of patents or other rights of third parties which may result from its use.

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DUAL FULL-BRIDGE PWM MOTOR DRIVER

MOTOR DRIVERS

Function Output Ratings* Part Number

INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS

3-Phase Power MOSFET Controller — 28 V 3933 3-Phase Power MOSFET Controller — 50 V 3932 3-Phase Power MOSFET Controller — 50 V 7600 2-Phase Hall-Effect Sensor/Driver 400 mA 26 V 3626 Bidirectional 3-Phase Back-EMF Controller/Driver ±600 mA 14 V 8906 2-Phase Hall-Effect Sensor/Driver 900 mA 14 V 3625 3-Phase Back-EMF Controller/Driver ±900 mA 14 V 8902–A 3-Phase Controller/Drivers ±2.0 A 45 V 2936 & 2936-120

INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORS

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

UNIPOLAR STEPPER MOTOR & OTHER DRIVERS

Voice-Coil Motor Driver ±500 mA 6 V 8932–A Voice-Coil Motor Driver ±800 mA 16 V 8958 Unipolar Stepper-Motor Quad Drivers 1 A 46 V 7024 & 7029 Unipolar Microstepper-Motor Quad Driver 1.2 A 46 V 7042 Unipolar Stepper-Motor Translator/Driver 1.25 A 50 V 5804 Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2540 Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2544 Unipolar 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 or

over-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.

†

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

Datasheet UDN2917EB, UDQ2917EB Datasheet (Allegro)

Specifications and Main Features

Frequently Asked Questions

User Manual