SGS Thomson Microelectronics L9935 Datasheet



TWO-PHASESTEPPER MOTOR DRIVER

2 X 1.1A FULLBRIDGEOUTPUTS INTEGRATEDCHOPPINGCURRENT REGU-

LATION MINIMIZED POWER DISSIPATION DURING

FLYBACK OUTPUT STAGES WITH CONTROLLED

OUTPUT VOLTAGE SLOPES TO REDUCE ELECTROMAGNETICRADIATION

SHORT-CIRCUIT PROTECTION OF ALL OUTPUTS

ERROR-FLAG FOR OVERLOAD,OPENLOAD ANDOVERTEMPERATURE PREALARM

DELAYED CHANNEL SWITCH-ON TO REDUCE PEAK CURRENTS

MAX.OPERATINGSUPPLYVOLTAGE24V STANDBYCONSUMPTIONTYPICALLY40µA SERIALINTERFACE (SPI)

BLOCK DIAGRAM

L9935

PowerSO20

ORDERING NUMBER: L9935

DESCRIPTION

The L9935 is a two-phase stepper motor driver circuit suited to drive bipolar stepper motors. The device can be controlled by a serial interface (SPI). All protections required to design a well protected system (short-circuit, overtemperature, cross conduction etc.) are integrated.

OUT

GND

SCK

SDI

SDO

VCC

CSN

GND

201

~

2

A1

3

4

5

6

7

8

EN

9

B1

10

DRIVER

COMMON

LOGIC

DRIVER

LOGIC

OSCILLATOR

DIAGNOSTIC

BIASING

LOGIC

~

19

18

17 16

15

14

13

12

11

D99AT415

GND

SR

OUT

N.C.

V

OSC

C

OUT

SR

GND

A

A2

S

DRV

B2

B

November 1999

1/19

L9935

PIN CONNECTION

GND

OUT

B1

EN CSN VCC

SDO

SDI

SCK

OUT

A1

GND GND

10 9 8 7 6 5 4 3 2 1

D99AT416

11 12 13 14 15 16 17 18 19 20

GND SR OUT C

DRV

OSC V

S

N.C. OUT SR

B

B2

A2

A

PIN FUNCTIONS

o

Pin N

1,10,11,20 GND Ground. (All ground pins are internally connected to the frame of thedevice).

2 OUT 3 SCK Clock for serial interface (SPI) 4 SDI Serial data input 5 SDO Serial data output 6 VCC 5V logic suplly voltage 7 CSN Chip select (Low active) 8 EN Enable (Low active)

9 OUT 12 SR 13 OUT 14 C 15 OSC Oscillator capacitor or external clock 16 VS Supply voltage 17 NC Not connected 18 OUT 19 SR

Name Description

A1

B1

B

B2

DRV

A2

A

Output 1 of full bridge 1

Output 1 of full bridge 2 Cyrrent sense resistor of the chopper regulator for OUT Output 2 of full bridge 2 Charge pump buffer capacitor

Output of full bridge 1 Current sense resistor of the chopper regulator for OUT

B

A

2/19

L9935

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

SPulsed

V

OUT (Ai/Bi)

I

OUT (Ai/Bi)

V

SRA/SRB

V

CC

V

CDRV

V

SCK,VSDI

V

CSN,VEN

V

OSC,VSDO

Note: ESD for allpins, except pins SDO, SRA and SRB, areaccording to MIL883C, tested at 2kV, corresponding to a maximum energy

dissipation of 0.2mJ. SDO, SRA and SRB pins are tested with800V.

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

R

th j-amb,FR4

T

S

T

SD

DC Supply Voltage -0.3 to 35 V Pulsed supply voltage T < 400ms -0.3 to 40 V Output Voltages internally clamped to V

or GND depending on the

current direction

DC Output Currents Peak Output Currents (T/tp ≥ 10)

1.2

± ±2.5

Sense Resistor Voltages -0.3 to 6.2 V Logic Supply Voltages -0.3 to 6.2 V Charge Pump BufferVoltage versus V

,

Logic Input Voltages -2 to 8 V

S

-0.3 to 10 V

Oscillator Voltage Range, Logic Output -0.3 to VCC+0.3 V

Typical Thermal Resistance Junction to Case 5 °C/W Typical Thermal Resistance Junction to Ambient

2

(6cm

Ground Plane 35µm Thhickness)

Typical Thermal Resistance Junction to Ambient

35 °C/W

8 °C/W (soldered on a FR 4 board with through holes for heat transfer and external heat sink applied)

Storage Temperature -40 to 150 °C Typical Thermal Shut-Down Temperature 180 °C

S

A A

ELECTRICALCHARACTERISTICS

erwise specified.)

1)

(8V ≤ V

≤ 24V; -40°C ≤ Tj≤ 150°C; 4.5V ≤ VCC≤ 5.5V, unless oth-

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

SUPPLY

IS

I

SOP

I

CC

85

Total Supply Current I

S+IVCC

(BothBridges Off)

Operating Supply Current I

5V Supply Current EN = LOW 1.4 10 mA

= 14V

V

S

EN = HIGH T

≤ 85°C

J

=0

OUT Ai/Bi

f

= 30kHz

OSC

V

= 14V

S

40 100

4.5 mA

FULL BRIDGES

R

OUT, Sink

R

OUT, Source

R

OUT8, Sink

V

FWD

V

REV

t

r,tf

R

of Sink Transistors Current bit

DSON

RDSON of Source Transistors 0.4 0.7 Ω

RDSON of Sink Transistors + R

of SourceTransistors

DSON

Forward Voltage of the DMOS Body Diodes

combinations LL, LH, V

12V

≥

S

Current bit Combinations LL, LH, V

=8V

S

EN = HIGH I

= 1A; VS≥ 12V

FWD

Reverse DMOS Voltage EN = LOW

I

=1A

REV

Rise and Fall Time of Outputs OUT

Ai/Bi

0.1...0.9 V

OUTVS

Chopping 550mA

= 14V

0.3 0.6 1.5

0.4 0.7 Ω

1.6 3 Ω

1 1.4 V

0.5 0.9 V

A

µ

s

µ

3/19

L9935

ELECTRICALCHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

R

SWITCH OFF THRESHOLD OF THE CHOPPER (R

2)

V V V

SRHL SRLH

SRLL

Voltage Drops Across R1⋅ R (Voltage at Pin SRAor SRBvs. GND)

Bit 5, 2 = H Bit 4, 1 = L 12 20 35 mV

2

Bit 5, 2 = L Bit4, 1 = H 160 180 210 mV Bit 5, 4, 2, 1 = L 270 300 340 mV

1

⋅

= 0.33Ω)

2

ENABLE INPUT EN

V

EN High

High Input Voltage V

CC

V

-1.2V

V

EN low

V

EN Hyst

I

EN High

I

EN Low

Low Input Voltage 1.2 V Enable Hysteresis 0.1 V High Input Current V

High=VCC

Low Input Current VLOW = 0V -3 -10 -30

-10 0 10

µ µ

A A

LOGIC INPUTS SDI. SCK, CSN

V

V I

HIGH

LOW

Hyst

HIGH

I

Low

High Input Voltage EN = LOW 2.6 8 V Low Input Voltage -0.3 1 V Hysteresis 0.8 1.2 1.6 V High Input Current V Low Input Current V

High=VCC

= 0V -3 -10 -30 µA

Low

-10 0 10 µA

LOGIC OUTPUTS (SDO)

V

SDO,High

High Output Voltage I

= -1mA VCC-1 V

SDO

CC

V

CC

V

-0.17

V

SDO,Low

Low Output Voltage ISDO = 1mA 0.17 1 V

OSCILLATOR

V

OSC, H

V

OSC, L

I f t

OSC OSC Start

High Peak Voltage EN = LOW 2.2 2.46 2.6 V Low Peak Voltage EN = LOW 1 1.23 1.4 V Charging/Discharging Current 45 62 80 µA Oscillator Frequency C Oscillator Startup Time EN = High→Low 2/f

= 1nF 20 25 31 kHz

OSC

osc

5/f

osc

8/f

osc

THERMAL PROTECTION

T

J-OFF

Thermal Shut-Down

160 180 200 °C

Temperature

T

J-ALM

∆T

MGN

1) Parameters are tested at 125°C. Values at 140°C are guaranteed by design and correlation.

2) Currents of combinations LH and LL are sensed at the external resistors. The Current of bit combination HL is sensed internally and cannot be adjusted by changing the sense resistors.

Thermal Prealarm 130 160 °C Margin Prealarm/Shut-Down 10 20 30 K

4/19

Figure1. General ApplicationCircuit Proposal.

GND 201 GND

2

OUT

SCK

A1

3

DRIVER

~

LOGIC

19 SR

18

17 16

OUT

N.C.

V

S

L9935

A

R1 0.33Ω

A2

+5V

100nF

SDI 4

SDO 5

CSN 7

EN 8

VCC 6

OUT

B1

GND 10

COMMON

LOGIC

9

SDI

INTERFACE

µC

Applicationhints:

C1 and C2 should be placed as close to the device as possible. Low ESR of C2 is advantageous. Peak currents through C1 and C2 may reach 2A. Care should be taken that the resonance of C1, C2 together with supply wire inductances isnot the choppingfrequencyor a multiple of it.

FUNCTIONAL DESCRIPTION Basic structure

The L9935 is a dual full bridgedriver for inductive

Table 1.

15 OSC

14

C

DRV

13 OUT

12 SR

11 GND

C

OSC

1nF

C

Driver

100nF

C1

100nF

B2

B

R2 0.33Ω

D99AT417

DRIVER

LOGIC

~

OSCILLATOR

DIAGNOSTIC

BIASING

loads with a choppercurrentregulation. Outputs A1and A2 belongto full bridge A Outputs B1and B2 belongto full bridge B The polarity of the bridges can be controlled by

bit0 and bit3 (for full bridge A, bit3, for full bridge B, bit0). Bit5, bit4 (for full bridge A) and bit2, bit1 (for full bridge B) control the currents. Bit3 high leads to output A1 high. Bit0 high leads to output B1 high.

Current setting Table 1 using a 0.33W sense resistor.

STEPPER

MOTOR

POWER SUPPLY

C2

10µF

bit5, bit2 bit4, bit1 IQX(Typ.) I

H H L L

H

L

H

L

0

60mA 550mA 900mA

RX/max

0%

61%

100%

Remark

inernally sensed

5/19

L9935

Figure 2. Typical average load current dependence on R

I

A

1.8

1.1 1

0.8

0.6

0.4

0.2

0.075 0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6

typical current limitation of high side transistor

limit recommended for usual application

suggested range of operation

Sense

I

LL

I

LH

I

HL

.

D99AT418

R

Ω

Full Bridge Function Figure 3. Displays a full bridge including the current sense circuit.

M

11

M

12

COMP1

+

D

11

A

1

12

D

12

LOAD

D

21

A

D

22

6/19

bit3, (bit0)

bit5, (bit2)

bit4, (bit1)

DRIVE LOGIC

τ

CURRENT

LOGIC

INHIBIT

ON HH

CURRENT ADJUST

D

M

21

2

M

22

R

1

R1EXTERNAL

SENSE RESISTOR

D

21

D

22

D99AT419

V

S