Data Sheet 29319.22†

2 91 7

GND

LOGIC SUPPLY 40

39

7 PWM 1

8

GND

38

9

37 1

10

36

11

35

12

34

13

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. Activelow ENABLE inputs control the four drivers in each bridge.

VBB

33

14

2

32

15

31

16

30

PWM 2

EN 2 ENABLE 2 27

GND

RC 2 28

θ2 V REF 2 25

PHASE 2 26

I21 24

I20 23

LOAD SUPPLY 22

OUT 2B 21

SENSE 2 20

29

E2 19

17

OUT 2A 18

GND

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 modulation (PWM) control of the output current to 1.5 A.

VCC

ENABLE 1

RC1 41

PHASE 1

42

θ 1 43

EN1

I11

VREF 1

1

44

OUT 1B

I10 2

SENSE 1

3

4

OUT 1A

E1

6

5

DUAL FULL-BRIDGE PWM MOTOR DRIVER

Dwg. PP-021

Dwg. PP-021

ABSOLUTE MAXIMUM RATINGS

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 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.

at TJ ≤ +150°C

Motor Supply Voltage, VBB .................... 45 V Output Current, IOUT (tw ≤ 20 µs) ..... ±1.75 A (Continuous) ............................... ±1.5 A Logic Supply Voltage, VCC .................... 7.0 V Logic Input Voltage Range, VIN ................................ -0.3 V to +7.0 V Output Emitter Voltage, VE ................... 1.0 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

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

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.

Always order by complete part number: UDN2917EB .

2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER

PWM CURRENT-CONTROL CIRCUITRY VBB

CHANNEL 1 PIN NUMBERS SHOWN.

22

OUT B 6

3

OUT A V REF 44 5

20 kΩ ÷10

E SENSE – 4

40 kΩ

RC

10 kΩ I0 2

ONE SHOT

+

RS

I1 1

41

SOURCE DISABLE

RC

CC RT

CT

TRUTH TABLE 12.5

T

R θJ

/W °C =6

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

Dwg. EP-007-2A

10

Enable

Phase

OutA

OutB

L L H

H L X

H L Z

L H Z

X = Don’t care Z = High impedance

7.5

5.0

R

2.5

θJA = 3 0°

C/W

0 25

50

75 100 TEMPERATURE IN °C

125

150 Dwg. GP-020B

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1991, 2000 Allegro MicroSystems, Inc.

2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 45 V, VCC = 5.0 V, VREF = 5.0 V (unless otherwise noted). Limits Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

10

—

45

V

VOUT = VBB

—