SGS Thomson Microelectronics L6285 Datasheet

L6285

3 CHANNELS MULTIPOWERSYSTEM

ADVANCE DATA

CHANNEL-A AND CHANNEL-B FOR UNIPO­LAR STEPPER MOTORS
– LOWSIDE: R
– HIGH SIDE ; R

DSON

DSON

= 1.2Ω

= 1.2Ω

CHANNEL-CFOR DC MOTORS
– LOWSIDE: R
– HIGH SIDE: R

DSON

DSON

= 1.7Ω

= 1.2Ω

CHOPPING MODE DRIVING FOR C.L. CUR­RENT CONTROL ON CHA AND CHB AND
O.L. VOLTAGECONTROL ONCHC.

INTERNALFOUR DRIVINGLATCHES
16 BIT INTERNAL SHIFTREGISTER
DIRECTINTERFACE TO µP
SERIALDRIVINGSEQUENCE LOADING
CMOSCOMPATIBLEINPUTS
PRE-ALARMOUTPUT SIGNAL
THERMAL SHUTDOWN

DESCRIPTION

This Combo Motor Driver uses large scale inte­gration to incorporate several functions into the
same chip.

1) Two unipolar steppermotor driver

2) A full bridgeDC motor driver

BLOCK DIAGRAM

MULTIPOWER BCD TECHNOLOGY

PLCC44 SDIP42

ORDERING NUMBERS:

L6285 L6285S

3) Serial microprocesor interface

The poweroutput stages areDMOS and the input
can be interfaced to a CMOS Microprocessor
logic.

The phase current in the unipolar stepper motor
windings is controlled by two external sensing re­sistors in fixed frequency choppingmode.The os­cillator block provides clocks each other 180° out
of phase to the two stepper motor driver in order
to avoidsymultaneous currentpeaks.

For the DC motor driver is used a bridge; the
RMS voltage to supply this motor is fixed by a

May 1994

This is advanced informationon a new product now in development or undergoing evaluation. Details are subject tochange without notice.

1/16

L6285

simple PWMopen loop. The 3 motorsare control­led by the micro through 4 latches of 4 bit each.
The loading of these registers is in serial mode.
The I.C. operates at 5V supply forthe logic and at

PINCONNECTION (Top view)

PWGND

OUT1A

S1,2A

OUT2A

CLAMPA

OUT3A

S3,4A
OUT4A
BOOT1
BOOT3

GND

7
8
9
10
11
12
13
14
15
16
17

COM3,4A

PWGND

SID

BOOT2

P

COM1,2A

V

PLCC44

STB

SCK

S1,2C

OUT2C

123564

2322211918 20 28272624 25

S

V

N.C.

OUT1C

COM1,2B

N.C.

A0TH

P

V

A1TH

PWGND

COM3,4B

40414244 43

39
38
37
36
35
34
33
32
31
30
29

V2

OSC RESET

PWGND
OUT1B
S1,2B
OUT2B
CLAMPB
OUT3B
S3,4B
OUT4B
VLOW
COSC
GND

D94IN067

24V supply for the power stages. The packages
are SDIP42 and PLCC44 with 6 pins devoted to
ground and to sink out the heat produced by
powerdissipation.

OUT2C

COM1,2A

COM3,4A

PWGND

OUT1A

S1,2A

OUT2A

CLAMPA

OUT3A

S3,4A
OUT4A
BOOT1
BOOT3

BOOT2

1
2

V

3

P

4

N.C. COM3,4B

5
6
7
8
9
10

SDIP42

11
12
13
14
15
16

GND

17

N.C.

18
19

SID

20

SCK

21

STB

D94IN060A

42
41
40
39
38

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22

S1,2C
OUT1C
COM1,2B
V

P

PWGND37
OUT1B
S1,2B
OUT2B
CLAMPB
OUT3B
S3,4B
OUT4B
V

LOW

C

OSC

GND
V2
OSC RESET
A1TH
A0TH
V

S

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V
V
V

I

LOW

I

HIGH

I

pLOW

I

pHIGH

V

bout

Power Supply Voltage 30 V

P

Logic SupplyVoltage 7 V

S

Logic Input Voltage -0.3 toVS+ 0.3 V

in

Low Side DMOS max DC Current 1 A
High Side DMOS max DC Current 1 A
Low Side DMOS max Peak Current (1µs On; 50µs OFF) 2 A
High Side DMOS max Peak Current(1µs On; 50µsOFF) 2 A
Max Output Voltage of Stepper Motor Driver(transient

60 V

rcirculation)

V

1;2 Max Voltage ON Vsense (CHA/CHB) -1 to2 V

sense

3 Max Voltage ON V

V

sense

Ι

fdDC

Ι

fdpk

Max DC Currentof Forward Diode(DMOS Source DrainDiode) 1 A
Max Peak Current of ForwardDiode (DMOS Source Drain

(CHC) -1 to 2 V

sense

2A

Diode) (1µs On;50µs OFF)

P

tot

T

op

T

stg

Total Power Dissipation (Tpins = 90°C)
With minimized dissipatingcopper area (T

amb

=70°C)

5

1.6
Operating Temperature Range 0 to 150 °C
Storage Temperature Range -40 to 150 °C

THERMAL DATA (PLCC44)

Symbol Description SDIP42 PLCC44 Unit

R

th j-pins

R

th j-amb

Thermal Resistance Junction-pins
Thermal Resistance Junction-ambient

Max.
Max.

15
48

12
50

W
W

°C/W
°C/W

2/16

PINDESCRIPTION

SDIP42

o

N

42 1 S1,2C Full bridge common source output to separate between power GND

1,41 2,44 OUT 1C, OUT 2C Output of the channel C bridge.

2 3 COM 1,2A High side DMOS channel A for current chopping in the windings

3,39 4,42 V

4 5 COM 3,4A High side DMOS channel A for current chopping in the windings

6,37 6,7,39,40 GND PowerGround and heatsinkpins.

7,9,

11,14

8 9 S1,2A ChannelA sourcesof theDMOS OUT 1A, OUT 2A. A sensing resistor

10,33 11,35 CLAMP A, CLAMP B These pinshave to be connected to an external zener diodeto

12 13 S3,4A Channel Asources of the DMOSOUT 3A,OUT 4A. A sensingresistor

14 15 BOOT 1 A capacitor between this pin and V

15 16 BOOT 3 A capacitor between this pinand internal diodes allows the change

16,27 17,29 GND Logic Ground and Heatsink pins.

18 18 BOOT 2 Charge pump oscillator output.
19 19 SID Serial data input.
20 20 SCK Serial clock for serial data input.
21 21 STB Strobe to transfer the16 bit shift register contentsto the latch

5,17 22,24 NC Notconnected.
22,39 23 V
23,24 25,26 A0TH / A1TH Open collector outputs for thermal informations to the µP.

25 27 OSC/ RESET An RC network connected to this pin defines the oscillatorfrequency

26 28 V2 A voltage to this pindefines the outputduty cycle ofChannel C.
28 30 C

29 31 V

30,32,

34,36

31 33 S 3, 4B Same as S 3, 4A,but for channelB.
35 37 S 1, 2B Same as S 1, 2A,but for channelB.
38 41 COM 3, 4B Same as COM 3, 4A, but for channel B.
40 43 COM 1, 2B Same as COM 1, 2A, but for channel B.

PLCC44

o

N

8,10

12,14

32,34
36,38

Name Functions

and logic GND.

connected pins to OUT 1A, OUT 2A.

p

Power Supply Voltage.

connected topins OUT 3A, OUT 4A.

OUT 1A, OUT 2A

Low side DMOS outputs of channel A stepper motor driver.

OUT 3A, OUT 4A

has to be connected from this pin and ground, forcurrent controlof
phase1,2 A.

clamp the output voltage spikes of channel A/B.

has to be connected from this pin and ground, forcurrent controlof
phase3,4 A.

high side DMOS driver gate.

pump to transfer energy to the capacitor at the pin BOOT 1.

registers.

s

Logic Supply Voltage.

for stepper drivers. When OSC/RES is <1V, a reset signal is
internally generated.

osc

A capacitor connected to thispin defines the chopping frequency of
channel C.

low

This pin is low when thechopping low voltage (V2 low level) is
selected; it is in highimpedance when the chopping high voltage(V2
high level) is selected. Only for CHC operation.

OUT4B, OUT3B

Low side DMOS outputs of channel B stepper motor driver.

OUT2B ,OUT1B

stores theovervoltage for each

p

L6285

3/16

L6285

ELECTRICAL CHARACTERISTICS (Tj=25°C, Vs=5V, Vp= 24V unless othewise specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

p

I

p

V

s

I

s

LOGICLEVEL

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

inL

V

inH

I

inL

I

inH

CHANNEL A AND CHANNEL B (UNIPOLARMOTORS)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

R

DSONL

R

DSONH

Power Supply Voltage 9 26.5 V
Quiescent Power Supply

(note 1) 7 mA

Current
Logic SupplyVoltage 4.5 5.5 V
Quiescent Logic Supply

(note 1) 20 mA

Current

Input Low Voltage -0.3 1.35 V
Input High Voltage 3.15 VS+0.3 V

Input Low Current Vin =V
Input High Current Vin =V

inL
inH

-10 µA
10 µA

Low Side DMOS ON Res. IDS = 0.7A 1.2 Ω
High Side DMOS ON Res. IDS = 0.7A 1.2 Ω

I

DSSL

Low Side DMOS Leakage

VDS= 60V;output OFF 2 mA

Current

I

DSSH

High Side DMOS Leakage

VP = 30V; VO= 0V -1.5 mA

Current

V

REF

Voltage reference to the
Comparator

LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4

T

d

Turn OFF Delay on HIGH
Side DMOS afterthe

(note 2)

100
220
340
465

125
250
375
500

150
280
410
535

1 µs

Sensing Current Reach the
Threshold Value

f

max

Max Chopping Frequency 40 KHz

CHANNEL C (DC MOTORS)(see Fig.5)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

f

osc

DC Duty Cycle V2 = 1/2V

I

b2

V

low

R

DSONH

R

DSONL

I

LH

I

LL

V

fddc

f

max

V

boot

I

Lboot

Oscillator Frequency Cosc = 3.3nF; V1 = 2/3VS 17 22 28 KHz

S

72 75 81 %
Comparator Input Bias V2 = 200mV -1 µA
Open Drain Output I = 5mA 0.2 0.4 V
High Side DMOS ON Res. IDS= 0.7A 1.2 Ω
Low Side DMOS ON Res. IDS= 0.7A 1.7 Ω
HSD MOS Leakage Current VP= 30V; VO=0V -1 mA
LSD MOSLeakage Current VO = 30V; Vsense = 0V -1.5 mA
Forward Diode DC Voltage

I

= 0.7A 1.4 2 V

fdcc

(DMOS Diode)
Max Chopping Frequency 40 KHz
Voltage on pin Boot1 Vp+7 V
Leakage Currenton pin Boot1 V

bott=Vp

+12V; Vp= 26.5V 200 µA

mV
mV
mV
mV

4/16

ELECTRICAL CHARACTERISTICS (continued)
OSCILLATOR (see Fig.6)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

f

osc

Oscillator Frequency

COSC = 3.3nF; R

= 10KΩ 27 41 46 KHz

OSC

Pin OSC/RESET

V

T

dsc

reset

Capacitor Discharge Time
(protect deadtime)

C

= 3.3nF; R

OSC

(see Fig.1)

OSC

= 10KΩ

0.8 1.4 2 s

Reset Threshold Voltage 1 V

INTERFACE TIMING

Symbol Parameter Test Conditions Min. Typ. Max. Unit

t1 SCK Data Clock Cycle (see Fig. 2) 200 ns
t2 SCK Data Set-upTime 30 ns
t3 SCK Data Hold Time 20 ns
t4 SCK-STB Interval Time 30 ns
t5 STB Pulse Width 100 ns

Note 1: No output loaded; all register tolow condition;no resetapplied; VP= 26.5V;VS= 5.5V
Note 2: The effectof theinternal filter (RC Network)is not considered.

L6285

µ

Figure 1: Discharge timet

or ProtectionTime

dsc

Figure 2: InterfaceTiming (Serialloading Mode)

Serial
Input Data

b15

b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

D15

D3 D2 D1 D0 D3 D2 D1 D0 D3 D2 D1 D0 D3 D2 D1 D0

Register 4 Register 3 Register 2 Register 1

D0

5/16