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PDF L6228PD Data sheet ( Hoja de datos )
| Número de pieza | L6228PD | |
| Descripción | DMOS DRIVER FOR BIPOLAR STEPPER MOTOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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) 0.73Ω TYP. 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
1 page  
L6228
PIN DESCRIPTION (continued)
PACKAGE
SO24/
PowerDIP24
PowerSO36
Name
PIN #
PIN #
21 5 OUT2A
22 7 VCP
23 8 RESET
24 9 VREFA
Type
Function
Power Output Bridge A Output 2.
Output
Charge Pump Oscillator Output.
Logic Input
Reset Pin. LOW logic level restores the Home State
(State 1) on the Phase Sequence Generator State
Machine.
If not used, it has to be connected to +5V.
Analog Input Bridge A Current Controller Reference Voltage.
Do not leave this pin open or connected to GND.
(6) Also connected at the output drain of the Over current and Thermal protection MOSFET. Therefore, it has to be driven putting in series
a resistor with a value in the range of 2.2KΩ - 180KΩ, recommended 100KΩ.
ELECTRICAL CHARACTERISTICS
(Tamb = 25°C, Vs = 48V, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
VSth(ON) Turn-on Threshold
5.8 6.3 6.8
V
VSth(OFF) Turn-off Threshold
5 5.5 6
V
IS Quiescent Supply Current
All Bridges OFF;
Tj = -25°C to 125°C (7)
5 10 mA
Tj(OFF) Thermal Shutdown Temperature
165 °C
Output DMOS Transistors
RDS(ON) High-Side + Low-Side Switch ON Tj = 25 °C
Resistance
Tj =125 °C (7)
1.47 1.69
2.35 2.70
Ω
Ω
IDSS Leakage Current
EN = Low; OUT = VS
2 mA
EN = Low; OUT = GND
-0.3
mA
Source Drain Diodes
VSD Forward ON Voltage
ISD = 1.4A, EN = LOW
1.15 1.3
V
trr Reverse Recovery Time
If = 1.4A
300 ns
tfr Forward Recovery Time
200 ns
Logic Inputs (EN, CONTROL, HALF/FULL, CLOCK, RESET, CW/CCW)
VIL Low level logic input voltage
-0.3 0.8 V
VIH High level logic input voltage
2 7V
IIL Low Level Logic Input Current GND Logic Input Voltage
-10
µA
IIH High Level Logic Input Current 7V Logic Input Voltage
10 µA
5/26
5 Page 
L6228
PWM CURRENT CONTROL
The L6228 includes a constant off time PWM current controller for each of the two bridges. The current control
circuit senses the bridge current by sensing the voltage drop across an external sense resistor connected be-
tween the source of the two lower power MOS transistors and ground, as shown in Figure 10. As the current in
the motor builds up the voltage across the sense resistor increases proportionally. When the voltage drop
across the sense resistor becomes greater than the voltage at the reference input (VREFA or VREFB) the sense
comparator triggers the monostable switching the bridge off. The power MOS remain off for the time set by the
monostable and the motor current recirculates as defined by the selected decay mode, described in the next
section. When the monostable times out the bridge will again turn on. Since the internal dead time, used to pre-
vent cross conduction in the bridge, delays the turn on of the power MOS, the effective off time is the sum of the
monostable time plus the dead time.
Figure 10. PWM Current Controller Simplified Schematic
TO GATE LOGIC
5mA
(0) (1)
S
Q
R
-
5V +
2.5V
COFF
RCA(or B)
ROFF
BLANKING TIME
MONOSTABLE
1µs
VSA (or B)
FROM THE
LOW-SIDE
GATE DRIVERS
MONOSTABLE
SET
BLANKER
DRIVERS
+
DEAD TIME
2H
DRIVERS
+
DEAD TIME
1H
IOUT
2 PHASE
STEPPER MOTOR
OUT2A(or B)
OUT1A(or B)
SENSE
COMPARATOR
+
COMPARATOR
OUTPUT
-
VREFA(or B)
2L
RSENSE
1L
SENSEA(or B)
D01IN1332
Figure 11 shows the typical operating waveforms of the output current, the voltage drop across the sensing re-
sistor, the RC pin voltage and the status of the bridge. More details regarding the Synchronous Rectification and
the output stage configuration are included in the next section.
Immediately after the Power MOS turns on, a high peak current flows through the sensing resistor due to the
reverse recovery of the freewheeling diodes. The L6228 provides a 1µs Blanking Time tBLANK that inhibits the
comparator output so that this current spike cannot prematurely re-trigger the monostable.
11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet L6228PD.PDF ] | |
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