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AN1451
APPLICATION NOTE
October 2003
1 INTRODUCTION
The L6208 is a highly integrated, mixed-signal power IC that allows the user to easily design a complete motor
control system for two-phase bipolar stepper motors. Figure 1 shows the L6208 block diagram. The IC inte-
grates eight Power DMOS, a centralized logic circuit which implements the phase generation and a constant
t
OFF
PWM current control technique (
Quasi-Synchronous mode
) for each of the two phases of the motor plus
other added features for safe operation and flexibility.
Figure 1. L6208 block diagram.
GATE
LOGIC
STEPPING
SEQUENCE
GENERATION
OVER
CURRENT
DETECTION
OVER
CURRENT
DETECTION
GATE
LOGIC
V
CP
V
BOOT
EN
CONTROL
CW/CCW
GND
GND
GND
GND
VREF
A
V
BOOT
5V10V
V
SA
V
SB
OUT1
A
OUT2
A
OUT1
B
OUT2
B
SENSE
A
CHARGE
PUMP
VOLTAGE
REGULATOR
ONE SHOT
MONOSTABLE
MASKING
TIME
THERMAL
PROTECTION
V
BOOT
V
BOOT
OCD
B
OCD
A
10V 10V
BRIDGE A
SENSE
COMPARATOR
BRIDGE B
D01IN1226
RC
A
+
-
SENSE
B
VREF
B
RC
B
HALF/FULL
CLOCK
RESET
L6208
PWM
by Domenico Arrigo, Vincenzo Marano and Thomas Hopkins
L6208 FULLY INTEGRATED TWO PHASE
STEPPER MOTOR DRIVER
Modern motion control applications need more flexibility that can be addressed only with specialized IC
products. The L6208 is a fully integrated stepper motor driver IC specifically developed to drive a wide range
of two phase (bipolar) stepper motors. This IC is a one-chip cost effective solution that includes several
unique circuit design features. These features, including a decoding logic that can generate three different
stepping sequences, allow the device to be used in many applications including microstepping. The principal
aim of this development project was to produce an easy to use, fully protected power IC. In addition several
key functions such as protection circuit and PWM current control drastically reduce external components
count to meet requirements for many different applications.
