L9935 Datasheet PDF - STMicroelectronics
| Part Number | L9935 | |
| Description | TWO-PHASE STEPPER MOTOR DRIVER | |
| Manufacturers | STMicroelectronics | |
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® L9935
TWO-PHASE STEPPER MOTOR DRIVER
2 X 1.1A FULL BRIDGE OUTPUTS
INTEGRATED CHOPPING CURRENT REGU-
LATION
MINIMIZED POWER DISSIPATION DURING
FLYBACK
OUTPUT STAGES WITH CONTROLLED
OUTPUT VOLTAGE SLOPES TO REDUCE
ELECTROMAGNETIC RADIATION
SHORT-CIRCUIT PROTECTION OF ALL
OUTPUTS
ERROR-FLAG FOR OVERLOAD, OPEN LOAD
AND OVERTEMPERATURE PREALARM
DELAYED CHANNEL SWITCH-ON TO RE-
DUCE PEAK CURRENTS
MAX. OPERATING SUPPLY VOLTAGE 24V
STANDBY CONSUMPTION TYPICALLY 40µA
SERIAL INTERFACE (SPI)
BLOCK DIAGRAM
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.
1
GND
~
20
GND
19
SRA
2
OUTA1
3
SCK
SDI
SDO
VCC
CSN
EN
4
5
6
7
8
DRIVER
LOGIC
COMMON
LOGIC
OSCILLATOR
DIAGNOSTIC
BIASING
18
OUTA2
17 N.C.
16
VS
15
OSC
14
CDRV
9
OUTB1
10
GND
November 1999
DRIVER
LOGIC
~
13
OUTB2
12
SRB
11
GND
D99AT415
1/19
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Figure 1. General Application Circuit Proposal.
L9935
GND 1
OUTA1 2
SDI
INTERFACE
µC
SCK 3
SDI 4
SDO 5
CSN 7
EN 8
+5V VCC 6
100nF
OUTB1 9
GND 10
~
DRIVER
LOGIC
COMMON
LOGIC
OSCILLATOR
DIAGNOSTIC
BIASING
DRIVER
LOGIC
~
20 GND
19 SRA
R1 0.33Ω
18 OUTA2
17 N.C.
16
VS
15 OSC
COSC
1nF
CDriver
14 100nF
CDRV
C1
100nF
STEPPER
MOTOR
POWER
SUPPLY
C2
10µF
13 OUTB2
12 SRB
R2 0.33Ω
11 GND
D99AT417
Application hints:
C1 and C2 should be placed as close to the de-
vice as possible. Low ESR of C2 is advanta-
geous. Peak currents through C1 and C2 may
reach 2A. Care should be taken that the reso-
nance of C1, C2 together with supply wire induc-
tances is not the chopping frequency or a multiple
of it.
FUNCTIONAL DESCRIPTION
Basic structure
The L9935 is a dual full bridge driver for inductive
Table 1.
loads with a chopper current regulation.
Outputs A1 and A2 belong to full bridge A
Outputs B1 and B2 belong to 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 re-
sistor.
bit5, bit2
H
H
L
L
bit4, bit1
H
L
H
L
IQX (Typ.)
0
60mA
550mA
900mA
IRX/max
0%
61%
100%
Remark
inernally sensed
5/19
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for L9935 electronic component. |
| Information | Total 19 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ L9935.PDF Datasheet ] | |
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