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
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
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
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
1.6 3
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
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 0.33
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 0.33
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
Full Bridge Function Figure 3. Displays a full bridge including the current sense circuit.
M
11
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
D
M
21
2
M
22
R
1
R1EXTERNAL
SENSE RESISTOR
D
21
D
22
D99AT419
V
S
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