L6258 Datasheet, PDF (1/18 Pages) STMicroelectronics – PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER

®
L6258
PWM CONTROLLED - HIGH CURRENT
DMOS UNIVERSAL MOTOR DRIVER
PRELIMINARY DATA
ABLE TO DRIVE BOTH WINDINGS OF A BI-
POLAR STEPPER MOTOR OR TWO DC MO-
TORS
OUTPUT CURRENT UP TO 1.5A EACH
WINDING
WIDE VOLTAGE RANGE: 12V TO 45V
FOUR QUADRANT CURRENT CONTROL,
IDEAL FOR MICROSTEPPING AND DC MO-
TOR CONTROL
PRECISION PWM CONTROL
NO NEED FOR RECIRCULATION DIODES
TTL/CMOS COMPATIBLE INPUTS
CROSS CONDUCTION PROTECTION
THERMAL SHUTDOWN
DESCRIPTION
L6258 is a dual full bridge for motor control appli-
cations realized in BCD technology, with the ca-
pability of driving both windings of a bipolar step-
per motor or bidirectionally control two DC
motors.
L6258 and a few external components form a
PowerSO36
ORDERING NUMBER: L6258
complete control and drive circuit. It has high effi-
ciency phase shift chopping that allows a very low
current ripple at the lowest current control levels,
and makes this device ideal for steppers as well
as for DC motors.
The power stage is a dual DMOS full bridge capa-
ble of sustaining up to 45V, and includes the di-
odes for current recirculation.
The output current capability is 1.5A per winding
in continuous mode, with peak start-up current up
to 2A.
A thermal protection circuitry disables the outputs
if the chip temperature exceeds the safe limits.
BLOCK DIAGRAM
VCP1
VREF1
I3_1
I2_1
I1_1
I0_1
PH_1
V_DD(5V)
VREF1
I3_2
I2_2
I1_2
I0_2
PH_2
TRI_CAP
C_FREF
C_P
CHARGE
PUMP
DAC
R_C2
C_C2
VCP2
EA_IN2
EA_OUT2
INPUT
&
SENSE
AMP
TRI_0
+
C
V_R
ERROR
+ ^AMP
-
+
-
TRI_180 C
-
VS
POWER
BRIDGE
1
VBOOT
C_BOOT
OUT1A
OUT1B
SENSE1B
R_s
VR GEN
V_R (V_DD/2)
THERMAL
PROT.
DAC
INPUT
&
SENSE
AMP
TRIANGLE
GENERATOR
TRI_0
TRI_180
V_R
ERROR
+ ^AMP
-
TRI_0
+
C
-
+
C
-
TRI_180
GND
EA_IN1
EA_OUT1
R_C1
C_C1
POWER
BRIDGE
2
SENSE1A
DISABLE
VS
OUT2A
OUT2B
SENSE2B
R_s
SENSE2A
D96IN430D
April 2000
1/18
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.