UC2717N_技术文档

UC1717

UC2717

UC3717

Stepper Motor Drive Circuit

FEATURES

DESCRIPTION

•

Half-step and Full-step Capability

The UC3717 has been designed to control and drive the current in

one winding of a bipolar stepper motor. The circuit consists of an LS-

TTL-compatible logic input, a current sensor, a monostable and an

output stage with built-in protection diodes. Two UC3717s and a few

external components form a complete control and drive unit for LS-

TTL or micro-processor controlled stepper motor systems.

Bipolar Constant Current Motor Drive

Built-in Fast Recovery Schottky

Commutating Diodes

•

Wide Range of Current Control 5-1000mA

Wide Voltage Range 10-45V

The UC1717 is characterized for operation over the full military tem-

perature range of -55°C to +125°C, the UC2717 is characterized for

-25°C to +85°C, and the UC3717 is characterized for 0°C to +70°C.

Designed for Unregulated Motor Supply

Voltage

•

Current Levels can be Selected in Steps

or Varied Continuously

Thermal Overload Protection

ABSOLUTE MAXIMUM RATINGS (Note 1)

Voltage

Logic Supply, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Output Supply, VM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45V

Input Voltage

Logic Inputs (Pins 7, 8, 9). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V

Analog Input (Pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vcc

Reference Input (Pin 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V

Input Current

Note 1: All voltages are with respect to ground, Pins

4,5, 12, 13. Pin numbers refer to DIL-16 package. Cur-

rents are positive into, negative out of the specified ter-

minal.

Note 2: Consult Packaging Section of Databook for in-

formation on thermal limitations and considerations of

package.

Logic Inputs (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA

Analog Inputs (Pins 10, 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA

±

Output Current (Pins 1, 15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A

Junction Temperature, TJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C

Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . -55°C to +150°C

BLOCK DIAGRAM

7/95

UC1717

UC2717

UC3717

CONNECTION DIAGRAMS

PACKAGE PIN FUNCTION

DIL-16 (TOP VIEW)

J or N Package

PLCC-20 (TOP VIEW)

Q Package

FUNCTION

N/C

1

BOUT

Timing

VM

2

3

4

Gnd

N/C

5

6

Gnd

VCC

I1

7

8

9

Phase

N/C

I0

Current

VR

Gnd

N/C

Gnd

Vm

AOUT

Emitters

10

11

12

13

14

15

16

17

18

19

20

RECOMMENDED OPERATING CONDITIONS

PARAMETER

MIN

4.75

10

TYP

MAX UNITS

Supply Voltage, VCC

5

5.25

40

800

2

V

mA

µs

Supply Voltage, VM

Output Current. IM

Rise Time Logic Inputs, tR

Fall Time Logic Inputs, tF

Ambient Temperature, TA

UC1717

20

2

µs

-55

-25

0

125

85

°C

UC2717

UC3717

70

Unless otherwise specified, these specifications apply for VCC = 5V, TA = TJ.

ELECTRICAL CHARACTERISTICS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNITS

Supply Current, ICC

25

mA

V

High-Level Input Voltage, Pins 7, 8, 9

Low-Level Input Voltage, Pins 7, 8, 9

High-Level Input Current, Pins 7, 8, 9

Low Level Input Current, Pins 7, 8, 9

Comparator Threshold Voltage

2.0

0.8

20

V

VI = 2.4V

VI = 0.4V

µA

mA

mV

µA

V

-0.4

390

230

65

IO = 0, I1 = 0, VR = 5.0V

IO = 1, I1 = 0, VR = 5.0V

IO = 0, I1 = 1, VR = 5.0V

420

250

80

440

270

90

Comparator Input Current

Output Leakage Current

Total Saturation Voltage Drop

Total Power Dissipation

-20

20

IO = 1, I1 = 1, TA = +25°C

100

4.0

2.1

3.1

35

IM = 500mA

IM = 500mA, fS = 30kHz

1.4

2.9

30

W

IM = 800mA, fS = 30kHz

W

Cut Off Time, tOFF

VM = 10V, tON≥ 5µs (See Figure 5 and 6)

TA = +25°C; dVc/dt ≥ 50mV/µs (See Figure 5 and 6)

25

µs

°C

Turn Off Delay, tD

1.6

2.0

+180

Thermal Shutdown Junction Temperature

+160

2

UC1717

UC2717

UC3717

Figure 3: Typical Sink Saturation Voltage vs Output Current

Figure 1

Figure 2: Typical Source Saturation Voltage vs Output Current

Figure 4: Typical Power Losses vs Output Current

FUNCTIONAL DESCRIPTION

The UC3717 drive circuit shown in the block diagram in-

cludes the following functions:

(1) Phase Logic and H-Bridge Output Stage

(2) Voltage Divider with three Comparators for current control

(3) Two Logic inputs for Digital current level select

(4) Monostable for off time generation

Input Logic: If any of the logic inputs are left open, the

circuit will treat it as a high level input.

Phase Input: The phase input terminal, pin 18, controls

the direction of the current through the motor winding.

The Schmidt-Trigger input coupled with a fixed time de-

lay assures noise immunity and eliminates cross conduc-

tion in the output stage during phase changes. A low

level on the phase input will turn Q2 on and enable Q3

while a high level will turn Q1 on and enable Q4. (See

Figure 7).

Figure 5: Connections and Component Values as in Figure 6.

across the source transistors. The Schottky diodes allow

the current to circulate through the winding while the sink

transistors are being switched off. The diodes across the

sink transistors in conjunction with the Schottkys provide

the path for the decaying current during phase reversal.

(See Figure 7).

Output Stage: The output stage consists of four Dar-

lington transistors and associated diodes connected in

an H-Bridge configuration. The diodes are needed to pro-

vide a current path when the transistors are being

switched. For fast recovery, Schottky diodes are used

PHASE INPUT

Low

Q1, Q4

Off

Q2, Q3

On

High

On

Off

3

UC1717

UC2717

UC3717

Figure 6

ing causing the current to decay. The time is determined

by the external timing components RT and CT as:

I0

0

1

0

1

I1

0

1

CURRENT LEVEL

100%

TOFF = 0.69 RTCT

60%

If a new trigger signal should occur during TOFF, it is ig-

nored.

19%

Current Inhibit

Current Control: The voltage divider, comparators and

monostable provide a means for current sensing and

control. The two bit input (I0, I1) logic selects the desired

comparator. The monostable controls the off time and

therefore the magnitude of the current decrease. The

time duration is determined by RT and CT connected to

the timing terminal (pin 2). The reference terminal (pin

11) provides a means of continuously varying the cur-

rent for situations requiring half-stepping and micro-

stepping. The relationship between the logic input

signals at pin 7 and 9 in reference to the current level is

shown in Table 1. The values of the different current lev-

els are determined by the reference voltage together

with the value of the external sense resistor RS (pin 16).

Single-Pulse Generator: The pulse generator is a

monostable triggered on the positive going edge of the

comparator. Its output is high during the pulse time and

this pulse switches off the power feed to the motor wind-

Note: Dashed lines indicate current decay paths.

Figure 7: Simplified Schematic of Output Stage

4

UC1717

UC2717

UC3717

FUNCTIONAL DESCRIPTION (cont.)

Overload Protection: The circuit is equipped with a

thermal shutdown function, which will limit the junction

temperature by reducing the output current. It should be

noted however, that a short circuit of the output is not

permitted.

Operation: When the voltage is applied across the motor

winding the current rises linearly and appears across the

external sense resistor as an analog voltage. This volt-

age is fed through a low pass filter RC, CC to the voltage

comparator (pin 10). At the moment the voltage rises be-

yond the comparator threshold voltage the monostable is

triggered and its output turns off the sink transistors. The

current then circulates through the source transistor and

the appropriate Schottky diode. After the one shot has

timed out, the sink transistsor is turned on again and the

procedure repeated until a current reverse command is

given. By reversing the logic level of the phase input (pin

8), both active transistors are being turned off and the

opposite pair turned on. When this happens the current

must first decay to zero before it can reverse. The cur-

rent path then provided is through the two diodes and the

power-supply. Refer to Figure 7. It should be noted at

this time that the slope of the current decay is steeper,

and this is due to the higher voltage build up across the

winding. For better speed performance of the stepping

motor at half step mode, the phase logic level should be

changed at the same time the current inhibit is applied. A

typical current wave form is shown in Figure 8.

Figure 9

The timing diagram in Figure 10 shows the required sig-

nal input for a two phase, full step, stepping sequence.

Figure 11 shows a one phase, full step, stepping se-

quence, commonly referred to as wave drive. Figure 12

shows the required input signal for a one phase-two

phase stepping sequence called half-stepping.

The circuit of Figure 13 provides the signal shown in Fig-

ure 10, and in conjunction with the circuit shown in Fig-

ure 9, will implement a pulse-to-step two phase, full step,

bidirectional motor drive.

The schematic of Figure 14 shows a pulse to half step

circuit generating the signal shown in Figure 12. Care

has been taken to change the phase signal the same

time the current inhibit is applied. This will allow the cur-

rent to decay faster and therefore enhance the motor

performance at higher step rates.

Figure 8

APPLICATIONS

A typical chopper drive for a two phase bipolar perma-

nent magnet or hybrid stepping motor is shown in Figure

9. The input can be controlled by a microprocessor, TTL,

LS or CMOS logic.

Using the UC3717 to drive the L298 provides a uniquely

packaged state-of-the-art high power stepper motor con-

trol and drive. See Figure 15.

5

UC1717

UC2717

UC3717

FUNCTIONAL DESCRIPTION (cont.)

Figure 10: Phase Input Signal for Two Phase Full Step Drive (4 Step Sequence)

Figure 11: Phase and Current-Inhibit Signal for Wave Drive (4 Step Sequence)

Figure 12: Phase and Current-Inhibit Signal for Half Stepping (8 Step Sequence)

Figure 13: Full Step Bidirectional Two Phase Drive Logic

6

UC1717

UC2717

UC3717

Figure 14: Half-Step, Bidirectional Drive Logic

CONSIDERATION

Half-Stepping: In the half step sequence the power in-

put to the motor alternates between one or two phases

being energized. In a two phase motor the electrical

phase shift between the windings is 90 degrees. The

torque developed is the vector sum of the two windings

energized. Therefore when only one winding is energized

the torque of the motor is reduced by approximately

30%. This causes a torque ripple and if it is necessary to

compensate for this, the V_Rinput can be used to boost

the current of the single energized winding.

which rise in an exponential manner as the frequency or

step rate is increased. The power losses can not be cal-

culated by I²R where I is the chopping current level and

R the DC resistance of the coil. Actual measurements in-

dicate the effective resistance may be many times larger.

Therefore, for 100% duty cycle the current must be lim-

ited to a value which will not overheat the motor. This

may not be necessary for lower duty cycle operation.

Interference: Electrical noise generated by the chopping

action can cause interference problems, particularly in

the vicinity of magnetic storage media. With this in mind,

printed circuit layouts, wire runs and decoupling must be

considered. 0.01 to 0.1µF ceramic capacitors for high fre-

quency bypass located near the drive package across

V+ and ground might be very helpful. The connection

and ground leads of the current sensing components

should be kept as short as possible.

Ramping: Every drive system has inertia and must be

considered in the drive scheme. The rotor and load iner-

tia plays a big role at higher speeds. Unlike the DC motor

the stepping motor is a synchronous motor and does not

change its speed due to load variations. Examining typi-

cal stepping motors, torque vs. speed curves indicates a

sharp torque drop off for the start-stop without error

curve, even with a constant current drive. The reason for

this is that the torque requirements increase by the

square of the speed change, and the power need in-

creases by the cube of the speed change. As it can be

seen, for good motor performance controlled accelera-

tion and deceleration should be considered.

Ordering Information

UNITRODE TYPE NUMBER

UC3717N - 16 Pin Dual-in-line (DIL) "Bat Wing" Package

UC1717J - 16 Pin Dual-in-line Ceramic Package

UC1717SP - 16 Pin Dual-in-line Hermetic Power Package

Iron Core Losses: Some motors, especially the Tin-Can

type, exhibit high iron losses mostly due to eddy currents

7

UC1717

UC2717

UC3717

Figure 15: UC3717 with L298 Power Amplifier

UNITRODE INTEGRATED CIRCUITS

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603)424-3460

8

PACKAGE OPTION ADDENDUM

www.ti.com

18-Sep-2008

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

LCCC

CDIP

LCCC

CDIP

PDIP

PLCC

Drawing

5962-9474601M2A

UC1717J

OBSOLETE

FK

J

20

16

20

16

20

TBD

Call TI

UC1717J883B

UC1717L883B

UC1717SP883B

UC2717J

J

FK

J

UC3717J

J

UC3717N

N

UC3717Q

FN

UC3717QTR

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

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Addendum-Page 1

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型号：	UC2717N
厂家：	TEXAS INSTRUMENTS
描述：	STEPPER MOTOR CONTROLLER, 1A, PDIP16, PLASTIC, DIP-16 电动机控制光电二极管
文件：	总10页 (文件大小：532K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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