SGS Thomson Microelectronics L6208N, L6208PD, L6208D Datasheet

FULLY INTEGRATED STEPPER MOTOR DRIVER

■

OPERATING SUPPLY VOLTAGE FROM 8 TO 52V

■ 5A PEAK CURRENT (2.8A DC)

■

R

DS(ON)

■

BUILT-IN DECODING LOGIC

■

BUILT-IN CONSTANT OFF-TIME PWM CURRENT CONTROL

■

FAST/SLOW DECAY MODE SELECTION

■

HIGH SIDE OVER CURRENT PROTECTION

5.6A TYP.

■

CROSS CONDUCTION PROTECTION

■

THERMAL SHUTDOWN

■ OPERATING FREQUENCY UP TO 100KHz

■

INTRINSIC FAST FREE WHEELING DIODES

■

UVLO: UNDER VOLTAGE LOCKOUT

DESCRIPTION

The L6208 is a fully integrated stepper motor driver manufactured with multipower BCD technology, which combines isolated DMOS power transistors with CMOS and bipolarcircuits on the same chip.

0.3Ω TYP. VALUE @ Tj=25°C

L6208

PRELIMINARY DATA

PowerDIP24 PowerSO36 SO24

(20+2+2) (20+2+2)

ORDERING NUMBERS:

L6208N L6208PD L6208D

The logic inputs are CMOS/TTL and µP compatible. The device also includes all the circuitry needed to drive a stepper motor, that is the constant off time PWM control that performs the chopping current control and the state machine that generates the stepping sequence. Other features are the protection of the high side switches against unsafe over current conditions and the thermal shutdown. The L6208 is assembled in PowerDIP24(20+2+2), PowerSO36 and SO24(20+2+2) packages.

BLOCK DIAGRAM

OUT2

V

A

B

SA

V

SB

V

SB

SA

PWM

Charge

Pump

PWM

V

A

B

RC

V

V RC

ref A

A

BOOT

CP

ref B

B

VSAVSA

V

SB

GND GND GND GND

EN

Reset

Clock

CW/CCW

HALF/FULL

Control

VSB

OUT1

A

B

SENSE

Logic

&

Drivers

SENSE

A

B

January 2001

This ispreliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

1/15

L6208

FUNCTIONAL BLOCK DIAGRAM

CONTROL

HALF/FULL

Clock

RESET

CW/CCW

RCA

VrefA

RCB

VrefB

Vboot

10V

Decoding

Logic

Voltage

Regulator

5V

Current

Detection

Vboot

Over

Thermal

Protection

EN

Input

Interface

Charge

Pump

VCP

Vboot

10V

One Shot

Masking

Time

Vboot

10V

Sense Comparator

VSA

OUT1A

OUT2A

SENSE A

PWM

BRIDGE A

VSB

BRIDGE B

OUT1B OUT2B SENSE B

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Test conditions Value Unit

V

IN,VEN

V

refA,VrefB

V

RCA,RCB

V

SENSE

V

BOOT

I

S(peak)

I

S

V

OD

T

stg,TOP

Supply Voltage 60 V

S

Input and Enable Voltage Range -0.3 to +7 V Voltage Range at V Voltage Range atRCAand RC

pins -0.3 to +7 V

ref

B

-0.3 to +7 V

pins DC Sensing Voltage Range -1 to +4 V Bootstrap Peak Voltage VS+10 V Pulsed Supply Current (foreach

V

pin), internally limited by the

S

< 1ms 7.1 A

t

PULSE

overcurrent protection. DCvSupply Current (foreach V

S

2.8 A

pin) Differential Voltage Between

60 V

VSA,OUT1A,OUT2A,SENSEAand

VSB, OUT1B, OUT2B, SENSE Storage and Operating

B

-40 to 150 °C

Temperature Range

2/15

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter MIN MAX Unit

L6208

V

OD

Supply Voltages 12 52 V

S

Differential Voltage Between

VSA, OUT1A,OUT2A,SENSEAand

VSB, OUT1B, OUT2B, SENSE

V

SENSE

Sensing voltage

(pulsed tw<t

V

I

OUT

ref

T

f

c

V

Operating Voltage -0.1 5

ref

DC Output Current 2.8 V Operating Junction Temperature -25 +125 °C

j

Commutation Frequency 100 kHz

PIN CONNECTIONS(Top View)

RC

V

refB

1

2 3

A

4

A

5

A

6 7 8

B

9

B

10

B

11 12

24 23 22

21

20 19 18 17 16 15 14 13

Clock

CW/CCW

SENSE

OUT1

GND

OUT1

SENSE

HALF/FULL

B

)

rr

(DC)

V

refA

Reset V

CP

OUT2

V

SA

GND GND V

SB

OUT2 V

BOOT

EN Control

52 V

-6

-1

GND

OUT2

A

Reset

V

Clock

CW/CCW

B

SENSE

OUT1

GND

NC

V

NC

V

refA

RC

NC

NC NC

SA

CP

1 2 3

4 5

A

6

7

8

9 10 11 12

A

13

A

14 15

A

16 17

18

36 35 34 33

32

31 30 29 28

27 26

25 24

23 22

21

20

19

6 1

GND NC NC

V

SB

OUT2

B

NC

V

BOOT

EN Control HALF/FULL V

refB

SENSE RC

B

NC

OUT1

B

NC NC GND

V V

PDIP24/SO24 PowerSO36

3/15

L6208

PIN DESCRIPTION

Name PowerSO36

PDIP24/

SO24

Function

V

SA

V

SB

OUT1

A

OUT2

A

OUT1

B

OUT2

B

SENSE SENSE

A

B

GND 1, 18, 19, 36 6, 7,

4 20 Supply voltage of the bridge A. 33 17 Supply voltage of the bridge B. Must be connected to VSA. 15

5 22

32

21

16

5

8

Bridge A outputs.

Bridge B outputs.

12 3 Sense resistor for the bridge A. 25 10 Sense resistor for the bridge B.

Common ground terminals. In Powerdip and SO packages, these pins

18, 19

are also used for heat dissipation toward the PCB.

EN 29 14 Chip Enable. A Low logic level applied to this pin switches Off all the

power DMOSs.

HALF/FULL 27 12 Logic input. When high, HALF STEP operation is selected; a Low logic

level selects FULL STEP operation. ONE-PHASE-ON FULL STEPMODE ( selecting FULLwhen the state machine is at an TWO-PHASE-ON FULL STEPMODE ( selecting FULLwhen the state machine is at an

Reset 8 23 Logic input. A Low logic levelrestores the

wave mode

even

normal mode

odd

home

state (state 1) on the

) is obtained by

numbered state. ) is obtained by numbered state.

state machine.

Clock 10 1 Logic input. Step Clock. The step occurs on the rising edge of this signal.

CW/CCW 11 2 Logic input. Logic High sets clockwise direction. Logic Low sets

counterclockwise direction.

Control 28 13 Logic input. Selects chopping style. FAST DECAY is selected with logic

Low. A logic High selects SLOW DECAY.

V

ref A

9 24 A voltage applied to these pins sets the reference voltage of the sense

comparators, determining the output current in PWM current control.

V

BOOT

RC

ref B

CP

A

26 11

7 22 Bootstrap oscillator. Oscillator output forthe external charge pump. 30 15 Supply voltage to overdrive the upper DMOSs. 13 4 A parallel RC network connected tothese pins sets the OFF time of the

low-side power DMOS of the correspondent bridge. The pulse generator

RC

B

24 9

is a monostable triggered by the output of the sense comparator of the bridge (t

= 0.69 RC).

OFF

4/15

THERMAL DATA

Symbol Description PDIP24 SO24 PowerSO36 Unit

L6208

R

th-j-pins

MaximumThermal Resistance

18 14 -

C/W

°

Junction-Pins

R

th-j-case

Maximum Thermal Resistance

-- 1°C/W

Junction-Case

R

th-j-amb1

R

th-j-amb2

<(1)>Mounted on a multiplayer PCB with a dissipating copper surface on the bottom side of 2 x 12mm x 25mm (with athickness of <(2)>It’s the same condition of the point above, without any heatsinking surface on the board.

MaximumThermal Resistance Junction-Ambient

Maximum Thermal Resistance Junction-Ambient

at least 35 µm).

(1)

(2)

42 50 35 °C/W

58 77 62 °C/W

ELECTRICAL CHARACTERISTICS

(T

=25°C, Vs= 48V, unless otherwise specified)

amb

Symbol Parameter Test Conditions Min Typ Max Unit

V

Output DMOS Transistors

I

DSS

R

DS(ON)

Source Drain Diodes

Supply Voltage 8 52 V

S

I

Quiescent Supply Current All Bridges OFF 5.5 10 mA

S

T

Thermal Shutdown Temperature 150 °C

j

Leakage Current VS= 52V 1 mA High-side Switch ON Resistance Tj=25°C 0.34 0.4

T

=125°C 0.53 0.59

j

Low-side SwitchON Resistance T

=25°C 0.28 0.34

j

T

=125°C 0.47 0.53

j

Ω Ω Ω Ω

V

Forward ON Voltage ISD= 2.8A, EN = LOW 1.2 1.4 V

SD

t

Reverse Recovery Time If= 2.8A 300 ns

rr

t

Forward Recovery Time 200 ns

fr

Switching Rates

t

D(on)

Output to out Turn ON Delay Time

t

ON

Output Rise Time

t

D(OFF)

Enable to out Turn OFF Delay Time

t

OFF

t

DCLK

Output FallTime Clock to output delay time

(3)

I

=2.8A 110 250 400 ns

LOAD

I

=2.8A 20 105 300 ns

LOAD

I

=2.8A 240 580 760 ns

LOAD

I

=2.8A 20 78 300 ns

LOAD

I

=2.8A 2 µs

LOAD

5/15