L6228Q 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
■ 2.8A 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
■ Under voltage lockout
■ Integrated fast free wheeling diodes
Applications
■ Bipolar stepper motor
Figure 1. Block diagram
VFQFPN 5x5 32L
Description
The L6228Q is a DMOS fully integrated stepper
motor driver with non-dissipative overcurrent
protection, realized in multipower-BCD
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 VFQFPN-32 5x5 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
V_BOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCD_A
OCD_B
STEPPING
SEQUENCE
GENERATION
January 2008
VOLTAGE
REGULATOR
10V 5V
V_BOOT
V_BOOT
VS_A
OVER
CURRENT
DETECTION
10V
GATE
LOGIC
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
Rev 1
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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