廬
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 40碌A
SERIAL INTERFACE (SPI)
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.
BLOCK DIAGRAM
GND
1
20
GND
~
19
SR
A
OUT
A1
2
DRIVER
LOGIC
18
OUT
A2
N.C.
V
S
17
16
SCK
3
SDI
SDO
VCC
CSN
EN
4
OSCILLATOR
5
6
7
8
COMMON
LOGIC
DIAGNOSTIC
15
OSC
14
BIASING
C
DRV
OUT
B1
9
DRIVER
LOGIC
13
OUT
B2
12
SR
B
GND
GND
10
~
11
D99AT415
November 1999
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