L6228Q_10 Datasheet, PDF (1/32 Pages) STMicroelectronics – DMOS driver for bipolar stepper motor

L6228Q
DMOS driver for bipolar stepper motor
Features
■ Operating supply voltage from 8 to 52 V
■ 2.8 A output peak current (1.4 A RMS)
■ R_DS(on) 0.73 Ω typ. value @ T_J = 25 °C
■ Operating frequency up to 100 kHz
■ Non dissipative overcurrent protection
■ Dual independent constant t_OFF PWM
current controllers
■ Fast/slow decay mode selection
■ Fast decay quasi-synchronous rectification
■ Decoding logic for stepper motor full and half
step drive
■ Cross conduction protection
■ Thermal shutdown
■ Undervoltage lockout
■ Integrated fast free wheeling diodes
Applications
■ Bipolar stepper motor
Figure 1. Block diagram
VFQFPN32 5 mm x 5 mm
Description
The L6228Q is a DMOS fully integrated stepper
motor driver with non-dissipative overcurrent
protection, realized in BCDmultipower technology,
which combines isolated DMOS power transistors
with CMOS and bipolar circuits on the same chip.
The device includes 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 VFQFPN32 5 mm x 5 mm package,
the L6228Q features a non-dissipative
overcurrent protection on the high side power
MOSFETs and thermal shutdown.
VBOOT
VCP
EN
CONTROL
HALF/FULL
CLOCK
RESET
CW/CCW
August 2010
V_BOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCD_A
OCD_B
STEPPING
SEQUENCE
GENERATION
VOLTAGE
REGULATOR
10V 5V
V_BOOT
V_BOOT
VS_A
OVER
CURRENT
DETECTION
10V
10V
GATE
LOGIC
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
BRIDGE A
BRIDGE B
Doc ID 14321 Rev 4
D01IN1225
OUT1_A
OUT2_A
SENSE_A
VREF_A
RC_A
VS_B
OUT1_B
OUT2_B
SENSE_B
VREF_B
RC_B
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