EVAL6208N Datasheet, PDF (1/27 Pages) STMicroelectronics – DMOS DRIVER FOR BIPOLAR STEPPER MOTOR

L6208
DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
s OPERATING SUPPLY VOLTAGE FROM 8 TO 52V
s 5.6A OUTPUT PEAK CURRENT (2.8A RMS)
s R_DS(ON) 0.3Ω TYP. VALUE @ T_j = 25°C
s OPERATING FREQUENCY UP TO 100KHz
s NON DISSIPATIVE OVERCURRENT
PROTECTION
s DUAL INDEPENDENT CONSTANT t_OFF PWM
CURRENT CONTROLLERS
s FAST/SLOW DECAY MODE SELECTION
s FAST DECAY QUASI-SYNCHRONOUS
RECTIFICATION
s DECODING LOGIC FOR STEPPER MOTOR
FULL AND HALF STEP DRIVE
s CROSS CONDUCTION PROTECTION
s THERMAL SHUTDOWN
s UNDER VOLTAGE LOCKOUT
s INTEGRATED FAST FREE WHEELING DIODES
TYPICAL APPLICATIONS
s BIPOLAR STEPPER MOTOR
DESCRIPTION
The L6208 is a DMOS Fully Integrated Stepper Motor
Driver with non-dissipative Overcurrent Protection,
realized in MultiPower-BCD technology, which com-
BLOCK DIAGRAM
PowerDIP24
(20+2+2)
PowerSO36
SO24
(20+2+2)
ORDERING NUMBERS:
L6208N (PowerDIP24)
L6208PD (PowerSO36)
L6208D (SO24)
bines isolated DMOS Power Transistors with CMOS
and bipolar circuits on the same chip. The device in-
cludes all the circuitry needed to drive a two-phase
bipolar stepper motor including: a dual DMOS Full
Bridge, the constant off time PWM Current Controller
that performs the chopping regulation and the Phase
Sequence Generator, that generates the stepping
sequence. Available in PowerDIP24 (20+2+2),
PowerSO36 and SO24 (20+2+2) packages, the
L6208 features a non-dissipative overcurrent protec-
tion on the high side Power MOSFETs and thermal
shutdown.
VBOOT
VCP
EN
CONTROL
HALF/FULL
CLOCK
RESET
CW/CCW
V_BOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCD_A
OCD_B
STEPPING
SEQUENCE
GENERATION
VOLTAGE
REGULATOR
10V 5V
September 2003
V_BOOT
V_BOOT
VS_A
OVER
CURRENT
DETECTION
10V
GATE
LOGIC
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
OUT1_A
OUT2_A
10V
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
BRIDGE A
BRIDGE B
D01IN1225
SENSE_A
VREF_A
RC_A
VS_B
OUT1_B
OUT2_B
SENSE_B
VREF_B
RC_B
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