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L6228Q Fiches technique(PDF) 1 Page - STMicroelectronics

No de pièce L6228Q
Description  DMOS driver for bipolar stepper motor
Download  32 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6228Q Fiches technique(HTML) 1 Page - STMicroelectronics

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August 2010
Doc ID 14321 Rev 4
1/32
32
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)
RDS(on) 0.73 Ω 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
Undervoltage lockout
Integrated fast free wheeling diodes
Applications
Bipolar stepper motor
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.
VFQFPN32 5 mm x 5 mm
Figure 1.
Block diagram
GATE
LOGIC
STEPPING
SEQUENCE
GENERATION
OVER
CURRENT
DETECTION
OVER
CURRENT
DETECTION
GATE
LOGIC
VCP
VBOOT
EN
CONTROL
CW/CCW
VREFA
VBOOT
5V
10V
VSA
VSB
OUT1A
OUT2A
OUT1B
OUT2B
SENSEA
CHARGE
PUMP
VOLTAGE
REGULATOR
ONE SHOT
MONOSTABLE
MASKING
TIME
THERMAL
PROTECTION
VBOOT
VBOOT
OCDB
OCDA
10V
10V
BRIDGE A
SENSE
COMPARATOR
BRIDGE B
D01IN1225
RCA
+
-
SENSEB
VREFB
RCB
HALF/FULL
CLOCK
RESET
PWM
www.st.com


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