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L6228N Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L6228N
Beschreibung DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 26 Seiten
L6228N Datasheet, Funktion
L6228
DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
s OPERATING SUPPLY VOLTAGE FROM 8 TO 52V
s 2.8A OUTPUT PEAK CURRENT (1.4A RMS)
s RDS(ON) 0.73TYP. VALUE @ Tj = 25°C
s OPERATING FREQUENCY UP TO 100KHz
s NON DISSIPATIVE OVERCURRENT
PROTECTION
s DUAL INDEPENDENT CONSTANT tOFF PWM
CURRENT CONTROLLERS
s FAST/SLOW DECAY MODE SELECTION
s FAST DECAY QUASI-SYNCHRONOUS
RECTIFICATION
s DECODING LOGIC FOR STEPPER MOTOR
FULL AND HALF STEP DRIVE
s CROSS CONDUCTION PROTECTION
s THERMAL SHUTDOWN
s UNDER VOLTAGE LOCKOUT
s INTEGRATED FAST FREE WHEELING DIODES
TYPICAL APPLICATIONS
s BIPOLAR STEPPER MOTOR
DESCRIPTION
The L6228 is a DMOS Fully Integrated Stepper Motor
Driver with non-dissipative Overcurrent Protection,
realized in MultiPower-BCD technology, which com-
BLOCK DIAGRAM
PowerDIP24
(20+2+2)
PowerSO36
SO24
(20+2+2)
ORDERING NUMBERS:
L6228N (PowerDIP24)
L6228PD (PowerSO36)
L6228D (SO24)
bines isolated DMOS Power Transistors with CMOS
and bipolar circuits on the same chip. The device in-
cludes 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 PowerDIP24 (20+2+2),
PowerSO36 and SO24 (20+2+2) packages, the
L6228 features a non-dissipative overcurrent protec-
tion on the high side Power MOSFETs and thermal
shutdown.
VBOOT
VCP
EN
CONTROL
VBOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCDA
OCDB
OVER
CURRENT
DETECTION
GATE
LOGIC
VBOOT
10V
VBOOT
10V
VSA
OUT1A
OUT2A
SENSEA
HALF/FULL
CLOCK
RESET
CW/CCW
STEPPING
SEQUENCE
GENERATION
VOLTAGE
REGULATOR
10V 5V
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
BRIDGE A
BRIDGE B
VREFA
RCA
VSB
OUT1B
OUT2B
SENSEB
VREFB
RCB
D01IN1225
September 2003
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/26






L6228N Datasheet, Funktion
L6228
ELECTRICAL CHARACTERISTICS (continued)
(Tamb = 25°C, Vs = 48V, unless otherwise specified)
Symbol
Parameter
Test Conditions
Vth(ON) Turn-on Input Threshold
Vth(OFF) Turn-off Input Threshold
Vth(HYS) Input Threshold Hysteresis
Switching Characteristics
tD(ON)EN Enable to Output Turn-on Delay
Time (8)
ILOAD =1.4A, Resistive Load
tD(OFF)EN Enable to Output Turn-off Delay ILOAD =1.4A, Resistive Load
Time (8)
tRISE Output Rise Time (8)
ILOAD =1.4A, Resistive Load
tFALL Output Fall Time (8)
ILOAD =1.4A, Resistive Load
tDCLK Clock to Output Delay Time (9) ILOAD =1.4A, Resistive Load
tCLK(min)L Minimum Clock Time (10)
tCLK(min) Minimum Clock Time (10)
H
fCLK Clock Frequency
tS(MIN) Minimum Set-up Time (11)
tH(MIN) Minimum Hold Time (11)
tR(MIN) Minimum Reset Time (11)
tRCLK(MIN Minimum Reset to Clock Delay
) Time (11)
tDT Dead Time Protection
fCP Charge Pump Frequency
Tj = -25°C to 125°C (7)
PWM Comparator and Monostable
IRCA, IRCB Source Current at pins RCA and VRCA = VRCB = 2.5V
RCB
Voffset Offset Voltage on Sense
Comparator
VREFA, VREFB = 0.5V
tPROP Turn OFF Propagation Delay (12)
tBLANK Internal Blanking Time on
SENSE pins
tON(MIN) Minimum On Time
tOFF PWM Recirculation Time
ROFF = 20KΩ; COFF = 1nF
ROFF = 100KΩ; COFF = 1nF
6/26
Min Typ Max Unit
1.8 2.0
V
0.8 1.3
V
0.25 0.5
V
500 650 800
ns
500 800 1000 ns
40 250 ns
40 250 ns
2 µs
1 µs
1 µs
100 KHz
1 µs
1 µs
1 µs
1 µs
0.5 1
0.6
µs
1 MHz
3.5 5.5
mA
±5 mV
500 ns
1 µs
2.5 3
13
61
µs
µs
µs

6 Page









L6228N pdf, datenblatt
L6228
Figure 11. Output Current Regulation Waveforms
IOUT
VREF
RSENSE
tOFF tON tOFF
VSENSE
VREF
0
VRC
5V
1µs tBLANK
Slow Decay
Fast Decay
tRCRISE
1µs tBLANK
Slow Decay
Fast Decay
tRCRISE
2.5V
tRCFALL
tRCFALL
ON
OFF
SYNCHRONOUS OR QUASI
SYNCHRONOUS RECTIFICATION
D01IN1334
B
1µs tDT
C DAB
1µs tDT
CD
Figure 12 shows the magnitude of the Off Time tOFF versus COFF and ROFF values. It can be approximately
calculated from the equations:
tRCFALL = 0.6 · ROFF · COFF
tOFF = tRCFALL + tDT = 0.6 · ROFF · COFF + tDT
where ROFF and COFF are the external component values and tDT is the internally generated Dead Time with:
20KΩ ≤ ROFF 100K
0.47nF COFF 100nF
tDT = 1µs (typical value)
Therefore:
tOFF(MIN) = 6.6µs
tOFF(MAX) = 6ms
These values allow a sufficient range of tOFF to implement the drive circuit for most motors.
The capacitor value chosen for COFF also affects the Rise Time tRCRISE of the voltage at the pin RCOFF. The
Rise Time tRCRISE will only be an issue if the capacitor is not completely charged before the next time the
monostable is triggered. Therefore, the on time tON, which depends by motors and supply parameters, has to
be bigger than tRCRISE for allowing a good current regulation by the PWM stage. Furthermore, the on time tON
can not be smaller than the minimum on time tON(MIN).
12/26

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