ETC AT5519

AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Features
General Description
• Interchangeable with SGS L6219DS
• 750mA continuous output current
• 28V output sustaining voltage
• Internal clamp diode
• Internal PWM current control
• Low output saturation voltage
• Internal thermal shutdown circuitry
• SOP-24 Package
The AT5519 motor driver is designed to drive both
winding of a bipolar stepper motor or bidirectionally control two DC motor. An internal
PWM controls the output current to 750mA with
peak startup current up to 1A. Two logic-level
inputs select output current limits of 0, 33, 67, or
100% of the maximum level. A PHASE input to
each bridge determines load current direction. A
thermal protection circuitry disables the outputs if
the chip temperature exceeds safe operating limits.
Applications
•Scanner
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
1
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Pin Configuration
Pin Description
Symbol
Pin
No.
OUT1A
1
OUT2A
Descript
Symbol
Pin
No.
Output Connection
VCC
13
2
Output Connection
RC1
14
SENSE2
3
COMP
IN2
OUT2B
4
5
Current
Sense
Connection
Input Connected
Comparator
Output Connection
GND
6
GND
Resistor VREF1
15
to
16
the PHASE1
Descript
Power supply input for Logic
circuitry
OFF time setting
Reference voltage
comparator
Current Flow input
the
input
of
of
I11
17
Ground
GND
18
Current
PWM1
Ground
7
Ground
GND
19
Ground
I02
8
20
I12
9
Current Level
input
PWM1
Output Connection
PHASE
10
Current Level
input of
I01
PWM2
Current Level
input of OUT1B
PWM2
Current Flow input
COMP
IN1
Reference voltage of the SENSE1
comparator
OFF time setting
VBB
2
VREF2
11
RC2
12
21
22
23
24
Level
of
Input Connected to the
Comparator
Current
Sense
Resistor
Connection
Power supply input for Load
circuitry
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
2
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Ordering Information
Part number
AT5519S
AT5519S_GRE
Package
SOP24
SOP24, Green
Marking
AT5519S
AT5519S, date code with one bottom line
Absolute Maximum Ratings
(Ta=+250C)
Item
Storage temperature
Operating temperature
Motor Supply Voltage
Output Peak Current
Output Continuous Current
Logic Supply Voltage
Logic Input Range
Output Emitter Voltage
Power consumption
Symbol
Ratings
Units
TSTG
TA
VBB
IOUT
IOUT
VCC
VIN
VSENSE
Pd
-55〜+150
-20〜+85
30
1.0
750
7
-0.3~+7.0
1.5
55
℃
℃
V
A
mA
V
V
V
°C/W
*Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set
of condition, do not exceed the specified peak current ragting or a junction temperature of +150°C
Power Dissipation
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
3
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Electrical Characteristics
(VCC=4.75~5.25V, VBB=28V,VREF=5.0V, TA=+250C, TJ≤+1500C)
Values
Parameter
Symbol
Condition
Unit
Min.
Typ.
Max.
10
-
28
V
VOUT=VBB
-
-
50
μA
VOUT=0V
-
-
-50
μA
28
-
-
V
Sink Driver, IOUT=±500mA
-
0.4
0.6
V
Sink Driver, IOUT=±750mA
-
1.0
1.2
V
Source Driver, IOUT=-500mA
-
1.1
1.4
V
Source Driver, IOUT=-750mA
-
1.3
1.6
V
IR
VR=28V
-
-
50
μA
VF
IF=750mA
-
1.6
2.0
V
IBB(ON) Both Bridges ON, no load
-
20
25
mA
IBB(OFF) Both Bridges OFF
-
5.0
10
mA
VIN(1) All Input
2.4
-
-
V
VIN(O) All Input
-
-
0.8
V
VIN=2.4V
-
-
20
μA
VIN=0.8V
-
-3.0
-200
μA
1.5
-
7.5
V
9.5
10
10.5
VREF/
I =2.4V, I1=0.8V
VCOMPIN 0
13.5
15
16.5
I0=0.8V, I1=2.4V
25.5
30
34.5
-
170
-
°C
-
40
50
mA
Output Drivers (OUTA or OUTB)
Motor Supply Voltage
VBB
Output Leakage Current
ICEX
Output Sustaining Voltage VCE(SUS) IOUT=±750mA,L=3.0mH
Output Saturation Voltage VCE(SAT)
Clamp Diode Leakage
Current
Clamp Diode Forward
Voltage
Driver Supply Current
Control Logic
Input Voltage
Input Current
IIN(1)
Reference Voltage Range
VREF Operating
I0=I1=0.8V
Current Limit
Threshold(at trip point)
Thermal Shutdown
Temperature
Total Logic Supply
Current
TJ
ICC(ON) I0=I1=0.8V, No Load
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
4
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
ICC(OFF) I0=I1=2.4V, No Load
-
10
12
mA
Typical Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
5
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Typical Application Information
PWM Current-Control Circuitry
Channel 1 Terminal Number Shown
PWM Current Control
The AT5519 output current is sensed and controlled independently in each bridge by an external sense
resistor (RS), Internal comparator, and monostable multivibrator. When the bridge is turned on, current
increases in the motor winding and it is sensed by the external sense resistor until the sense voltage
(VCOMPIN) reaches the level set at the comparator input:
I TRIP =
V REF
10 × R S
The comparator then triggers the monostable which turns off the source driver of the bridge. The actual
load current peak will be slightly higher than the trip point because of the internal logic and switching
delays. The delay (td) is typically 2µs. The source driver’s off time is determined by the monostable’s
external RT and CT timing components.
t off = RT × C T
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
6
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to
the comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at
the desired level.
An external RCCC time delay should be used to further delay the action of the comparator. Depending
on load type, many applications will not require these external components (SENSE connected to
COMP IN).
Logic control of output current
The current level in the motor winding is selected with theses inputs. If any of the logic inputs is left
open, the circuit will treat it has a high level input.
Current Control Truth Table
I0
L
H
L
H
I1
L
L
H
H
Output Current
VREF/10*RS= ITrip
VREF/15*RS=2/3 ITrip
VREF/30*RS=1/3 Itrip
0
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
7
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Phase control
The PHASE control input determines the direction of current flow in the windings, depending on the
motor connections. The signal is fed through a schmidt-trigger for noise immunity, and through a time
delay (approximately 2µs) in order to guarantee that no short-circuit occurs in the output stage during
phase-shift.
Current Flow control Truth Table
PHASE
OUTA
OUTB
H
L
H
L
L
H
Loads with high distributed capacitances may result in high turn-on current peaks. This peak (appearing
across RS) will attempt to trip the comparator, resulting in erroneous current control or high-frequency
oscillations. An external RCCC time delay should be used to further delay the action of the comparator.
Depending on load type, many applications will not require these external components( SENSE
connected to COMP IN).
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
8
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
All four drivers in the bridge output can be turned off between steps (I0=I1≥2.4V) resulting in a fast
current decay path. The fast current decay is desirable in half-step and high-speed applications. The
PHASE, I0, and I1 inputs float high. Varying the reference voltage (VREF) provides continuous control
of the peak load current for microstepping applications.
Thermal protection circuitry turns off all drivers when the junction temperature reaches +170°C. It is
only intended to protect the device from failures due to excessive junction temperature and should not
imply that output short circuits are permitted. The output drivers are re-enabled when the junction
temperature cools to +145°C.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
9
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Operating waveform
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
10
AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
Small Outline
24-pin Plastic SOP
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
11