Series SLA7070M Motor Driver INTRODUCTION This document describes

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Application Note 28210.03
Series SLA7070M Motor Driver
INTRODUCTION This document describes function features SLA7070M series, which unipolar 2-phase stepping motor driver ICs. This document contains preliminary information products under development. Should have questions, including information options, contact your nearest sales representative office. Features Power supply voltages, V(max.), normal operating range Logic supply voltages, VDD: Maximum output currents: Built-in sequencer Simplified clock-in stepping control Both full/half-stepping, microstepping versions; microstepping versions (SLA7075M, -76M, -77M, -78M) capable full-, half-, quarter-, eighth-, sixteenth-stepping Built-in sense resistor, RSInt (NEW) variants pin-compatible enhanced design flexibility type 23-pin molded package (SLA package) Self-excitation current control with fixed off-time microstepping parts, off-time adjusted automatically step reference current ratio levels) Built-in synchronous rectifying circuit reduces losses (NEW) Contents Synchronous chopping function prevents motor noise Hold mode Sleep mode reducing input current stand-by state Built-in protection circuitry against motor coil opens/shorts option available (NEW, patent pending)
Introduction Part Numbers Options Specifications Reference Voltage Setting Allowable Power Dissipation Package Outline Drawing, SLA-23 Functional Block Diagram Assignments Application Example Microstepping Products Truth Tables Logic Input Pins Step Sequencing Individual Circuit Description Functional Description Application Information Thermal Design Information Characteristic Data
performance characteristics given typical values circuit system baseline design only nominal operating voltage ambient temperature +25°C, unless otherwise stated.
Sanken Power Devices from Allegro MicroSystems
PART NUMBERS OPTIONS following product variants optional features available SLA7070M series. combinations standard models product options available high-volume production quantities. information product availability, assistance with determining features that best your application, please contact sales office representative.
NOTE following abbreviations used throughout this document refer product variants: Product with both Protection Circuitry built-in RSInt options Product with built-in RSInt option
Part Number SLA7070MR SLA7070MPR SLA7071MR SLA7071MPR SLA7072MR SLA7072MPR SLA7073MR SLA7073MPR SLA7075MR SLA7075MPR SLA7076MR SLA7076MPR SLA7077MR SLA7077MPR SLA7078MR SLA7078MPR RSInt
Protection
Output Current, IOUT
Sequencer
Blanking Time (µs)
Clock Edge
Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt RSInt Protection Circuitry RSInt
Full/half Step
Microstep
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Positive
Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS, valid 25°C, applicable both products, unless otherwise specified
Characteristics Load (Motor) Supply Voltage Main Power Supply Voltage Logic Supply Voltage Symbol SLA7070M SLA7075M Output Current IOUT SLA7071M SLA7076M SLA7072M SLA7077M SLA7073M SLA7078M Logic Input Voltage Input Voltage Sense Voltage Power Dissipation Junction Temperature Ambient Temperature Storage Temperature VREF VSInt Tstg considered Without heat sink Remarks Ratings -0.3 VDD+0.3 -0.3 VDD+0.3 Units
RECOMMENDED OPERATING RANGES, applicable both products, unless otherwise specified
Characteristics Load (Motor) Supply Voltage Main Power Supply Voltage Logic Supply Voltage Case Temperature Symbol Surge voltage should less than ±0.5 avoid malfunctioning operation Measured without heat sink Remarks Units
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ELECTRICAL CHARACTERISTICS, valid 25°C, applicable both products, unless otherwise specified
Characteristics Main Power Supply Current Logic Power Current MOSFET Breakdown Voltage Maximum Response Frequency Logic Supply Voltage Logic Supply Current Symbol IBBS VDSS fclk VREF Input Voltage Input Current SENSE Voltage Sleep-Enable Recovery Time Switching Time VREFS IREF VSInt tcon tcoff VREF Step reference current ratio: 100% VREF Clock Output Clock Output pages Output OFF, Sleep1 mode, IBBS specification, sequencer enable Clock Duty Cycle Normal mode Sleep1 Sleep2 modes Test Conditions Min. 0.75 VREF 0.03 Typ. VREF Max. 0.25 VREF 0.03 Units
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
STEPPING CHARACTERISTICS, applicable both products; representative values from SLA7070M series shown Valid 25°C, unless otherwise specified
Characteristics Symbol Mode Mode ton(min) toff Mode Mode Mode Mode Mode Mode Mode Step Reference Current Ratio Mode Mode Mode Mode Mode Mode Mode Mode (Load) Output Voltage (Load) Output Current Minimum On-Time Off-Time VMOL VMOH IMOL IMOH ton(min) toff1 toff2 toff3 Mode Mode Mode Mode Mode Mode IMOL 1.25 IMOH -1.25 VREF VSInt VREF Test Conditions Min. 1.25 -1.25 Typ. 98.1 95.7 92.4 88.2 83.1 77.3 70.7 63.4 55.5 47.1 38.2 19.5 Max. 1.25 1.25 Units
Full/half step products, SLA7070M, SLA7071M, SLA7072M, SLA7073M
Step Reference Current Ratio Minimum On-Time Off-Time VREF VSInt VREF
Microstepping products, SLA7075M SLA7078M
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OUTPUT CHARACTERISTICS both products Valid 25°C, unless otherwise specified
Characteristics Output Resistance Body Diode Forward Voltage Output Resistance Body Diode Forward Voltage Output Resistance Body Diode Forward Voltage Output Resistance Body Diode Forward Voltage Symbol RDS(ON) RDS(ON) RDS(ON) RDS(ON) Test Conditions Min. Typ. 0.85 0.45 0.25 0.95 0.18 0.95 Max. 0.85 1.25 0.24 Units
IOUT (SLA7070M SLA7075M)
IOUT (SLA7071M SLA7076M)
IOUT (SLA7072M SLA7077M)
IOUT (SLA7073M SLA7078M)
BUILT-IN SENSE RESISTOR CHARACTERISTICS products Valid 25°C, unless otherwise specified
Characteristics Sense Resistor Rating* Input Voltage Sense Resistor Rating* Input Voltage Sense Resistor Rating* Input Voltage Sense Resistor Rating* Input Voltage Symbol RSInt VREF RSInt VREF RSInt VREF RSInt VREF Tolerance: Within specified current limit Tolerance: Within specified current limit Tolerance: Within specified current limit Tolerance: Within specified current limit Test Conditions Min. 0.296 0.296 0.199 0.150 Typ. 0.305 0.305 0.205 0.155 Max. 0.314 0.314 0.45 0.211 0.160 0.45 Units
IOUT (SLA7070MPR, SLA7070MR, SLA7075MPR, SLA7075MR)
IOUT (SLA7071MPR, SLA7071MR, SLA7076MPR, SLA7076MR)
IOUT (SLA7072MPR, SLA7072MR, SLA7077MPR, SLA7077MR)
IOUT (SLA7073MPR, SLA7073MR, SLA7078MPR, SLA7078MR)
*RSInt includes approximately circuit resistance addition resistance resistor itself.
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
PROTECTION CIRCUIT CHARACTERISTICS* Valid 25°C, unless otherwise specified
Characteristics Symbol VOCP VFlagL VFlagH FLAG Output Current IFlagL IFlagH *Protection circuits work condition VSInt VOCP. Test Conditions Motor coils shorted IFLAGL 1.25 IFLAGH -1.25 Min. 0.65 1.25 -1.25 Typ. Max. 0.75 1.25 1.25 Units
products
Overcurrent Sense Voltage FLAG Output Voltage
REFERENCE VOLTAGE SETTING VREF (REF/SLEEP1 Pin)
Products
VREF
Sleep1 Range
Prohibition Zone
0.45 Devices Devices
VOCP
products only
Motor Current Range
1.5, Devices
Motor Current Range determined built-in resistor value, RSInt. products, extra attention change-over between motor current specification range, IMO, Sleep1 Range. VOCP falls "prohibition zone" threshold. change-over time slow, operation would start when VSInt VOCP
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Allowable Power Dissipation,
ALLOWABLE POWER DISSIPATION
Ambient Temperature, (°C)
Products
Allowable Power Dissipation,
j-a= 26.6/W
Ambient Temperature, (°C)
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Series SLA7070M Motor Driver
j-a= 33.8/W
Series SLA7070M Motor Driver
PACKAGE OUTLINE DRAWING, SLA-23
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FUNCTIONAL BLOCK DIAGRAM ASSIGNMENTS
Full/half step products: SLA7070MPR, SLA7071MPR, SLA7072MPR, SLA7073MPR
Ref/Sleep1
PreDriver Protect
Reg. PreDriver Protect
Sequencer Sleep Circuit
Comp RSInt Synchro Control
Comp RSInt
SenseA
Control
Control
Sync
products, protection circuits built-in. FLAG connected internally.
Symbol OutA OutA SenseA Clock Step clock input
Functions Output phase Output phase Phase current sensing internal connection Commutation Sleep2 setting
Symbol Sleep1 Reset Sync Flag* SenseB OutB
Functions Input control current Sleep setting Power supply logic Reset internal logic Forward reverse switch input Synchronous control switch input Output from protection circuits monitor Phase current sensing Output phase
Main power supply (for motor) Ground
OutB
Output phase
*Flag active products only; internally connected products.
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Reset Clock OutB OutB OutB OutB Flag N.C. SenseB
Series SLA7070M Motor Driver
OutA
OutA
OutA
OutA
Microstepping products: SLA7075MPR, SLA7076MPR, SLA7077MPR, SLA7078MPR
Ref/Sleep1
Series SLA7070M Motor Driver
Reset
Clock
OutB
OutB
OutB
OutA
RSInt
OutA
OutB
OutA
OutA
Flag
Reg.
PreDriver
Protect
Sequencer Sleep Circuit
PreDriver
Protect
SenseA
Comp
Control
Synchro Control
Control
Comp
SenseB
RSInt
Sync
products, protection circuits built-in. FLAG connected internally.
Symbol OutA OutA SenseA Clock Step clock input
Functions Output phase Output phase Phase current sensing Output from monitor 2-phase excitation status Commutation Sleep2 setting
Symbol Sleep1 Reset Sync Flag* SenseB OutB
Functions Input control current Sleep1 setting Power supply logic Reset internal logic Forward reverse switch input Synchronous control switch input Output from protection circuits monitor Phase current sensing Output phase
Main power supply (for motor) Ground
OutB
Output phase
*Flag active products only; internally connected products.
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APPLICATION EXAMPLE MICROSTEPPING PRODUCTS
Microstepping products: SLA7075MPR, SLA7076MPR, SLA7077MPR, SLA7078MPR
10~44
3.0~5.5 Sleep Microcomputer
OutA
OutA
OutB
OutB
Reset Clock Sync Flag Ref/Sleep1 SenseA
707xM
SenseB
Single-Point Ground Power Ground
Logic Ground
Take precautions avoid noise line; noise levels greater than line cause device malfunction. Noise reduced separating Logic Ground Power Ground from (pin 12). Constants, reference only: (VR)
Unused logic input pins RESET, SYNC) must pulled down ground. those unused pins left open, device malfunctions. Unused logic output pins (Mo, FLAG) must kept open.
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
TRUTH TABLES Common Input Pins following truth table valid common input pins both models SLA7070M series
Truth Table Common Input Pins Applicable both series models; products
Name Reset Sleep1 Sync Level Normal operation Forward High Level Logic reset Reverse Clock Edge
circuitry, including output MOSFETs regulator, sequencer translator circuit active. Therefore, microcontroller step starting point next operation during Sleep1 function.
Commutation Sleep2 Function Setting following truth
table valid common pins both models SLA7070M series.
Truth Table Commutation Sleep2 Function Applicable both series models; products
Name Sleep2 function Full Half Step Full step (Mode fixed) Full step (Mode fixed) Half step Half step (Mode fixed) Microstepping
Commutation Sleep2 function Normal operation Non-sync control Sleep1 function Sync control
Full step (Mode fixed) Full step (Mode fixed) Half step Half step (Mode fixed) Quarter step Eighth step Sixteenth step Sleep2 function
Reset function asynchronous. input Reset High, internal logic circuit reset. this point, stays Low, then DMOS outputs turn starting point excitation. Note that Disable control available with Reset signal. Sync function active only "2-phase excitation timing." this function used other than 2-phase excitation timing, overall balance might collapse because off-time current different each phase phase control scenario. (2-phase excitation timing point where step reference current ratio both phase phase Mode Sleep Functions Hold mode stops motor rotation when applying current into motor, device remains Active status. Sleep1 sleep operation when logic circuits operate according input signals. Sleep2 sleep operation which status logic circuits vary, instead, they keep same state before sleep function initiated.
Sleep1 Function Setting Voltage SLEEP1
Sleep2 function, outputs disabled driver supply current (IBB) reduced. However, unlike Sleep1 function, logic circuitry into "standby" state therefore sequencer translator activated, even step command signal occurs CLOCK input pin. Monitor Output used monitor device output different between these configurations: Microstepping products: (2-phase excitation timing) products: Flag (Protection circuit operation timing) Note that products with microstepping have both monitor output pins.
Truth Table Monitor Outputs
Name FLAG Level Other than 2-phase excitation timing Normal operation High Level 2-phase excitation timing Protection circuit operation
controls current Sleep1 function. normal operation, VREF should below (Low level). Applying voltage greater than (High level) SLEEP1 disables outputs puts motor free state (coast). This function used minimize power consumption when device use. Although disables much internal
outputs turn point where protection circuit starts operating. release protection state, reinput logic supply voltage.
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LOGIC INPUT PINS
pass filter incorporated with logic input pins (RESET, CLOCK, SYNC) improves noise rejection. logic inputs CMOS input compatible, therefore they high impedance state. fixed input level, either High. Input Logic Timing CLOCK signal. This device includes clock-in type control that simplifies interface. Pulse characteristics low-to-high high-to-low transition CLOCK input sequences translator sequencer. Clock pulse width should both positive negative polarities. Therefore, clock response frequency becomes kHz. Set-up hold times before after Clock pulse With regard input logic pins, delay should occur both before after pulse edges, set-up hold times. sequencer logic circuitry might malfunction logic polarity changed during these set-up hold times. Refer figure below.
RESET input RESET input pulse width Reset pulse width equivalent high pulse level hold time. should greater than CLOCK input pulse width. Reset release CLOCK input timing RESET input sets translator sequencer predefined Home state turns DMOS outputs. pass filter incorporated into Reset circuit; therefore, greater than delay required between falling edge RESET input rising edge CLOCK input. logic change Logic level inputs translator step direction step mode (M1, refer Commutation Truth Table). Changes these inputs take effect until rising edge CLOCK input. However, depending type state motor, there errors motor operation. thorough evaluation changes sequence should carried out.
Reset
2s(min) 5s(min) 4s(min) 2s(min) 2s(min)
Edge
Clock
2s(min) 1s(min) 1s(min) 2s(min)
1s(min) 1s(min)
Reset
2s(min) 5s(min)
Logic Input Timing
8s(min) 4s(min) 4s(min)
Clock
1s(min) 1s(min) Northeast Cutoff, 15036 1s(min)Worcester, Massachusetts 01615-0036 1s(min)
1s(min)
1s(min)
Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
STEP SEQUENCING illustrations this section based step sequencing (Positive) edge.
Full step; both microstepping full half step products (Mode
ESET
CREW
(Mode
ESET
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Half step; both microstepping full half step products (Mode
(Mode
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Series SLA7070M Motor Driver
Quarter step; microstepping products
Series SLA7070M Motor Driver
CREWW
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Eighth step; microstepping products
CREWW
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Series SLA7070M Motor Driver
Sixteenth step; microstepping products
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CREWW
Series SLA7070M Motor Driver
Excitation Change Sequence change behavior determined settings excitation (M1, before after step signal.
Excitation Mode State Table Internal Sequence State Direction Phase Phase Mode Mode Full Step Mode Mode Step Sequencing Half Step Step Mode Mode
Rev. Fwd. Sequence state Mode step reference current ratio Mode Mode step reference current ratio 100%, off-time
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Step
Series SLA7070M Motor Driver
Step
Series SLA7070M Motor Driver
INDIVIDUAL CIRCUIT DESCRIPTION
Monolithic (MIC) descriptions monolithic (MIC) elements this section applicable both models products: However, blanking time differs among some options, current value current mode will vary according minimum on-time difference. Sequencer Logic single CLOCK input used step timing. Direction controlled input. Commutation mode controlled combination logic levels. details, refer Commutation Truth Table page Current Control Each pair outputs controlled fixed off-time current-control circuit. internal oscillator (OSC) sets off-time. operation mechanism identical that SLA7060M family. Refer Functional Description section further details. Synchronous Operation Mode This function prevents occasional motor noise during Hold mode, which normally results from asynchronous operation both motor phases. logic high SYNC input sets synchronous operation. logic sets asynchronous operation. synchronous operation during normal stepping recommended because produces less motor torque cause motor vibration staircase current. synchronous operation when motor operation allowed only full/half step sequence timing, difference current controlled off-time other step sequence timings. (D-to-A Converter) microstep sequencing, current each step value sense resistor (RSInt), reference voltage (VREF), output voltage DACs, controlled output sequencer (translator). Refer Stepping Characteristics table page
Regulator Circuit integrated regulator circuit used driving output MOSFET gates powering other internal linear circuits. Protection Circuit built-in protection circuit against motor coil opens shorts available products. Protection activated sensing voltage internal RSInt resistors; therefore, overcurrent condition cannot detected which results from pins SENSEx pins, both, shorting GND. Protection against motor coil opens available only during operation; therefore, does work constant voltage driving, when motor rotating high speed. Operation protection circuit disables DMOS outputs. come protection mode, cycle logic supply, VDD. Output MOSFET Chip value built-in output DMOS chip varies according which four different output current ratings been selected. Sense Resistor Sense resistors incorporated products detect motor current. resistance varies according which four different output current ratings been selected, follows:
Output Current RSInt Resistance Typ.) 0.305 0.305 0.205 0.155
Each resistance shown above includes inherent resistance (approximately resistor itself.
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FUNCTIONAL DESCRIPTION Current Control description this section applicable products. Blanking time actual operating waveforms SENSEx pins when driving motor shown figure Immediately after turns OFF, ringing spike) noise SENSEx pins observed Ringing noise generated various causes, such capacitance between motor coils inappropriate motor wiring. Each pair outputs controlled fixed off-time depending stepping mode) current-control circuit that limits load current desired value, ITRIP. Initially, outt enabled current flows through motor winding current-sense resistors. When voltage across currentsense resistor equals output voltage, VTRIP currentsense comparator resets latch. This turns driver fixed off-time, during which load inductance causes current recirculate off-time period. Therefore, ringing noise sense resistor equals surpasses VTRIP turns off. prevent this phenomenon, blanking time override signals from current-sense comparator certain period right after turns (figure
Expanded Time Scale
ITRIP
ns/Div. µs/Div. Figure Operating waveforms SENSEx pins during chopping
Pulse Width tOFF (Fixed)
ITRIP
Blanking Time
Figure SENSEx pins pattern during control
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
Period off-time SLA7070M series controlled fixed time internal oscillator. also switched levels current proportion (see Electrical Characteristics table). addition, SLA7070M series provide function that decreases losses occurring when turns off. This function dissolves back stored motor coil MOSFET turn-on, well turn-on (synchronous rectification operation).
Figure shows difference back generative system between SLA7060M series SLA7070M series. SLA7060M series performs on-off operations using only MOSFET PWM-on side, SLA7070M series also performs on-off operations using only MOSFET PWM-off side. prevent simultaneous switching MOSFETs synchronous rectification operation, dead time approximately During dead time, back flows through body diode MOSFET.
SLA7060M Series
Ioff
SLA7070M Series
Ioff
Stepper Motor
Stepper Motor
Back Dead Time RSExt RSInt
Dead Time
Dead Time
Gate Signal
Gate Signal
VREF
VREF
Figure Synchronous rectification operation. During Dead Time, Back flows through body diode MOSFET
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Protection Functions: Types types SLA7070M series include motor coil short-circuit protection circuit motor coil open protection circuit. They described this section. Motor Coil Short-Circuit Protection (Load Short) Circuit This protection circuit, embedded SLA7070M series, begins operate when device detects increase voltage level sense resistor, VSInt voltage which motor coil short-circuit protection starts operation, VOCP, approximately output
disabled time protection circuit starts. order motor coil short-circuit protection circuit operate, VSInt must greater than VOCP Overcurrent that flows without passing sense resistor undetectable. resume circuit after protection operates, must cycled. Motor Coil Open Protection Details this functions disclosed patent policy.
Coil Short Circuit
Coil Short Circuit Normal Operation Output Disable
Stepper Motor
VOCP
VREF
RSInt
Figure Motor coil short circuit protect circuit operation. Overcurrent that flows without passing sense resistor undetectable. recover circuit after protection operates, must cycled started again.
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
APPLICATION INFORMATION
Motor Current Ratio Setting (R1, RSInt) setting calculation motor current IOUT SLA7070M series determined ratios external components RSInt (refer application example circuit page 12). following formula calculating IOUT: when VREF within specification. VREF less than variation impedance wiring pattern influence possibility less accurate current sensing becomes high. standard voltage current ITRIP that SLA7070M series controls partially divided internal DAC: RSInt value, Sense Resistor section, page Lower Limit Control Current SLA7070M series uses self-oscillating current control topology which off- time fixed. energy stored motor coil eliminated within fixed off-time, coil current flows intermittently, shown figure Thus, average current decrease motor torque also decrease. point intermissive current starts flowing coil considered lower limit control current. lower limit control current differs conditions motor other factors, calculated from following formula.
where:
motor supply voltage, RDS(on) MOSFET resistance, IOUT target current level, motor winding resistance, motor winding reactance, tOFF off-time.
Even control current value less than lower limit control current, there setting which fails operate. However, control current will worsen against setting current. Avalanche Energy unipolar topology SLA7070M series, surge voltage (ringing noise) that exceeds MOSFET capacity withstand might applied prevent damage, SLA7070M series designed MOSFET having sufficient avalanche resistance withstand this surge voltage. Therefore, even surge voltages occur, users will able without problems. However, cases which motor harness long used above rated current voltage, there possibility that avalanche energy could applied that exceeds Sanken design expectations. Thus, users must test avalanche energy applied under actual application conditions. ITRIP(Big) ITRIP(Small)
Figure Control current lower limit model waveform. circled area indicates interval when coil current generated
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following procedure used check avalanche energy application. schematic figure illustrates location voltage test points circuit characteristics. timing diagram illustrates waveform characteristics resultant.
avalanche energy, EAV, calculated using following
formula:
Stepper Motor
comparing calculated with graph shown figure application evaluated safe being within avalanche energy-tolerated dose range MOSFET.
RSInt
On-Off Sequence Power Supply (VBB VDD) There restriction on-off sequence main power supply, VBB, logic supply, VDD. Motor Supply Voltage (VM) Main Power Supply Voltage (VBB) Because SLA7070M series structure that separates control (MIC) power MOSFETs shown schematics pages motor supply main power supply separated. Therefore, possible drive with using different power supplies different voltages motor supply main power supply. However, extra caution needed because supply voltage ranges differ among power supplies.
Figure Test points characteristics (left panel) breakdown waveform (right). Given: VDS(AV)
SLA7073M SLA7078M
SLA7072M SLA7077M SLA7071M SLA7076M SLA7070M SLA7075M
Product Temperature, [°C]
Figure SLA7070M series iterated avalanche energy tolerated dose, EAV(max).
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
Internal Logic Circuits Reset sequencer circuit this product initialized after logic supply (VDD) applied, power reset function operates. initialize sequencer, output immediately after power-on indicates that status that power circuits home state. case where sequencer must reset after motor been operating, reset signal must inputted RESET pin. case which external reset control necessary, RESET used, must fixed logic level application circuit board. CLOCK Input When CLOCK input signal stops, excitation changes motor Hold state. this time, there difference CLOCK input signal level high level. SLA7070M series designed move step time, when Clock pulse edge detected. Chopping Synchronous Circuit SLA7070M series chopping synchronous function protect from abnormal noises that occasionally occur during motor-Hold state. This function operated setting SYNC terminal high level. However, this function used during motor rotation, control current does stabilize, therefore this cause reduction motor torque increased vibration. Sanken does recommend using this function while motor rotating. addition, synchronous circuit should disabled order control motor current properly case used other than dual excitation state (Modes single excitation Hold state.
74HC14 74HC14
normal operation, generally input signal switching sent from external microcomputer. However, applications where input signal cannot transmitted adequately limitations port, following method taken functions. schematic diagram figure shows designed that Sync signal determined CLOCK input signal. When logic high signal received CLOCK pin, internal capacitor, charged, Sync signal logic level. However, Clock signal cannot rise above logic level (such when circuit between microcomputer adequate), capacitor discharged internal resistor, Sync signal logic high, causing shift synchronous mode. time constant circuit should determined minimum clock frequency used. case sequence that keeps CLOCK input signal logic high, inverter circuit must added. case where Clock signal undetermined level, edge detection circuit (figure used prepare signal CLOCK input, allowing correct processing circuit shown figure Output Disable (Sleep1 Sleep2) Circuits There methods this motor free-state (coast, with outputs disabled). REF/SLEEP1 more than (Sleep1), other (Sleep2) excitation signals (pins M3). either way, will change Sleep mode, stopping main power supply same time, decreasing circuit current. difference between methods that, first way, internal sequencer remains enabled state, latter method, enters Hold state. Moreover, method using
Clock
Sync
Step Clock
Clock
Figure Clock signal shutoff detection circuit, using 74HC14s.
Figure Clock signal edge detection circuit, inputs example circuit shown figure
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excitation signals (Sleep2), excitation timing remains "standby" state, even signal inputted CLOCK during Sleep mode. When awaking normal operating mode (motor rotation) from disabled (Sleep1 Sleep2) mode, appropriate delay time from cancellation disable mode initial CLOCK input edge. doing consider only rise time also rise time motor excitation current, important (see figure 10).
REF/SLEEP1 REF/SLEEP1 provides access following functions: Standard voltage setting output current level setting Output enable-disable control input These functions further described Truth Tables section (page 13), discussion output disabling, above. figure Reference Voltage Setting section (page shows general relationship between reference voltage, VREF (REF/SLEEP1 pin) setting voltage performance. There are, however, situations which extra caution should exercised. These shown figure Range this range, control current value also varies accordance with VREF. Therefore, losses sense resistors must given extra consideration.
REF/SLEEP1 (minimum) CLOCK
Figure Timing delay between disable cancellation next Clock input
Range this range, voltage that switches output enable disable (Sleep mode) exists. enable, same cautions apply range addition, some cases, there possibilities that output status will become unstable result iteration between enable disable.
Internal Control Current Setting Voltage (Mode
Control current input voltage range Output disable (Sleep mode) setting voltage range Range Range
REF/SLEEP1 Voltage VREF
Figure Relationship between external internal reference voltages performance. Ensure that absolute maximum current level reached.
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Series SLA7070M Motor Driver
Logic Input Pins logic input (CLOCK, RESET, F/R, SYNC) used (fixed logic level), must tied GND. Please leave them floating, because there possibility undefined effects performance
Series SLA7070M Motor Driver
when they left open. Output Pins FLAG output pins designed monitor outputs, inside output inverter (see figure 12). Therefore, these pins float they used.
Static electricity protection circuit
FLAG
Figure (SLA 7075M through 7078M models only) FLAG general internal circuit layout
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THERMAL DESIGN INFORMATION
practical calculate power dissipation SLA7070M series accurately, because that would require factors that variable during operation, such time periods excitation modes during motor rotation, input frequencies sequences, forth. Given this situation, preferable perform approximate calculation worst conditions. following simplified formula calculation power dissipation: where:
Based calculated using above formulas, expected increase operating junction temperature, estimated using figure This result must added worst case ambient temperature when operating, TA(max). Based calculation, there problem unless TA(max) 150°C. However, final confirmation must made measuring temperature during operation then verifying power dissipation junction temperature corresponding graph. When used with heat sink attached, device package thermal resistance, RJA, variable used calculating Tj-a.
power dissipation IOUT operating output current, RDS(on) resistance output MOSFET, RSInt current sense resistance.
Increase Junction Temperature (°C)
TJ-A 26.6
TC-A 21.3
Maximum Allowable Power Dissipation, PD(max)
Figure Temperature increase
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Series SLA7070M Motor Driver
Series SLA7070M Motor Driver
value calculated from following formula:
where RFin thermal resistance heat sink. calculated with using value RJA:
CAUTION SLA7070M series designed multichip, with separate power elements (MOSFET), control (MIC), sense resistance. Consequently, because control cannot accurately detect temperature power elements (which primary sources heat), provide protection function against overheating. thermal protection, users must conduct sufficient thermal evaluations able ensure that junction temperature does exceed warranty level (150°C). This thermal design information provided preliminary design estimations only. thermal performance will significantly determined conditions application, particular state mounting PCB, heat sink, ambient air. Before operating application, user must experimentally determine actual thermal performance. maximum recommended case temperatures center, are: With external heat sink connection: 90°C With external heat sink connection: 80°C
following procedure should used measure product temperature actual operation then estimate junction temperature: Measure ambient temperature, With device mounted operating, measure temperature device case center (pin 12). Power-on device, after reaches operating temperature, take measurement again. Subtract value found step from value found step This will provide value TCA. Refer figure locate value found step trace. Determine corresponding power dissipation, Substitute values into equation
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CHARACTERISTIC DATA Output MOSFET On-Voltage, VDS(on)
SLA7070M/SLA7075M Iout=1A
Iout=1.5A SLA7071M/SLA7076M
VDS(on)
VDS(on)
Iout=0.5A
Iout=1A
Product Temp Tc[C]
SLA7072M/SLA7077M Iout=2A
SLA7073M/SLA7078M
Iout=3A
VDS(on)
VDS(on)
Iout=2A
Iout=1A
Iout=1A
Product Temp Tc[C]
Product Temp Tc[C]
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036
Series SLA7070M Motor Driver
Output MOSFET Body Diodes Forward Voltage,
SLA7070M/SLA7075M
Series SLA7070M Motor Driver
SLA7071M/SLA7076M
Iout=1A
Iout=1.5A
Iout=0.5A
Iout=1A
Product Temp Tc[C]
Product Temp Tc[C]
SLA7073M/SLA7078M
SLA7072M/SLA7077M
Iout=3A
Iout=2A
Iout=1A
Iout=2A
Iout=1A
Product Temp Tc[C]
Product Temp Tc[C]
www.allegromicro.com
Series SLA7070M Motor Driver
WARNING These devices designed operated lethal voltages energy levels. Circuit designs that embody these components must conform with applicable safety requirements. Precautions must taken prevent accidental contact with power-line potentials. connect grounded test equipment. isolation transformer recommended during circuit development breadboarding.
products described herein manufactured Japan Sanken Electric Co., Ltd. sale Allegro MicroSystems, Inc. Sanken Allegro reserve right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Therefore, user cautioned verify that information this publication current before placing order. When using products described herein, applicability suitability such products intended purpose shall reviewed users responsibility. Although Sanken undertakes enhance quality reliability products, occurrence failure defect semiconductor products certain rate inevitable. Users Sanken products requested take, their risk, preventative measures including safety design equipment systems against possible injury, death, fires damages society device failure malfunction. Sanken products listed this publication designed intended components general-purpose electronic equipment apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their application requiring radiation hardness assurance (e.g., aerospace equipment) supported. When considering Sanken products applications where higher reliability required (transportation equipment control systems equipment, fire- burglar-alarm systems, various safety devices, etc.), contact company sales representative discuss obtain written confirmation your specifications. Sanken products without written consent Sanken applications where extremely high reliability required (aerospace equipment, nuclear power-control stations, life-support systems, etc.) strictly prohibited. information included herein believed accurate reliable. Application operation examples described this publication given reference only Sanken Allegro assume responsibility infringement industrial property rights, intellectual property rights, other rights Sanken Allegro third party that result from use. G1,IC-FAE www.allegromicro.com

Series SLA7070M Motor Driver INTRODUCTION This document describes

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