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AT5519
Preliminary Product Information Dual Full-Bridge Stepper Motor Driver Features
* 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
General Description
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: service@aimtron.com.tw 1
AT5519
Preliminary Product Information Dual Full-Bridge Stepper Motor Driver Pin Configuration
Pin Description
Symbol Pin No. Descript Symbol Pin No. Descript
OUT1A OUT2A SENSE2 COMP IN2 OUT2B GND GND I02 I12 PHASE VREF2 RC2
2
1 2 3 4 5 6 7 8 9 10 11 12
Output Connection Output Connection Current Sense Connection Input Connected Comparator Output Connection Ground Ground
VCC RC1 Resistor VREF1 to the PHASE1 I11 GND GND
13 14 15 16 17 18 19 20 21 22 23 24
Power supply input for Logic circuitry OFF time setting Reference voltage comparator Current Flow input Current PWM1 Ground Ground Current Level input PWM1 Output Connection of Level of the
input
of
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
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: service@aimtron.com.tw 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
Symbol
Ratings
Units
Storage temperature Operating temperature Motor Supply Voltage Output Peak Current Output Continuous Current Logic Supply Voltage Logic Input Range Output Emitter Voltage Power consumption
TSTG TA VBB IOUT IOUT VCC VIN VSENSE Pd
-55150 -2085 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 +150C
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: service@aimtron.com.tw 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 Min. Output Drivers (OUTA or OUTB) Motor Supply Voltage Output Leakage Current VBB ICEX VOUT=VBB VOUT=0V 10 28 0.4 1.0 1.1 1.3 1.6 20 5.0 28 50 -50 0.6 1.2 1.4 1.6 50 2.0 25 10 V A A V V V V V A V mA mA Typ. Max. Unit
Output Sustaining Voltage VCE(SUS) IOUT=750mA,L=3.0mH Sink Driver, IOUT=500mA Output Saturation Voltage VCE(SAT) Sink Driver, IOUT=750mA Source Driver, IOUT=-500mA Source Driver, IOUT=-750mA Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current Control Logic Input Voltage VIN(1) All Input VIN(O) All Input IIN(1) VIN=2.4V VIN=0.8V IR VF VR=28V IF=750mA
IBB(ON) Both Bridges ON, no load IBB(OFF) Both Bridges OFF
2.4 1.5 9.5 13.5 25.5 -
-3.0 10 15 30 170 40
0.8 20 -200 7.5 10.5 16.5 34.5 50
V V A A V
Input Current Reference Voltage Range
VREF Operating I0=I1=0.8V VREF/ I =2.4V, I1=0.8V VCOMPIN 0 I0=0.8V, I1=2.4V
Current Limit Threshold(at trip point) Thermal Shutdown Temperature Total Logic Supply Current
TJ ICC(ON) I0=I1=0.8V, No Load
C mA
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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 x 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 2s. The source driver's off time is determined by the monostable's external RT and CT timing components.
t off = RT x 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: service@aimtron.com.tw 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: service@aimtron.com.tw 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 2s) 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: service@aimtron.com.tw 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=I12.4V) 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 +170C. 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 +145C.
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: service@aimtron.com.tw 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: service@aimtron.com.tw 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: service@aimtron.com.tw 11

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