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STMicroelectronics - DMOS driver

Numéro de référence L6228Q
Description DMOS driver
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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L6228Q fiche technique
L6228Q
DMOS driver for bipolar stepper motor
Features
Operating supply voltage from 8 to 52 V
www.DataSheet4U.com2.8A output peak current (1.4 A RMS)
RDS(ON) 0.73 typ. value @ TJ = 25 °C
Operating frequency up to 100 kHz
Non dissipative overcurrent protection
Dual independent constant tOFF 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
VBOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCDA
OCDB
STEPPING
SEQUENCE
GENERATION
January 2008
VOLTAGE
REGULATOR
10V 5V
VBOOT
VBOOT
VSA
OVER
CURRENT
DETECTION
GATE
LOGIC
10V
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
Rev 1
OUT1A
OUT2A
10V
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
BRIDGE A
BRIDGE B
D01IN1225
SENSEA
VREFA
RCA
VSB
OUT1B
OUT2B
SENSEB
VREFB
RCB
1/32
www.st.com
32

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