DUAL STEPPER MOTOR DRIVER GENERAL DESCRIPTION NJM13775 switch-mod

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DUAL STEPPER MOTOR DRIVER GENERAL DESCRIPTION NJM13775 switch-mod

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NJM13775
DUAL STEPPER MOTOR DRIVER
GENERAL DESCRIPTION NJM13775 switch-mode (chopper), constant current driver with channels: each winding two-phase stepper motor. NJM13775 equipped with Disable input simplify half-stepping operation. NJM13775 contains clock oscillator, comparators flip-flops implementing switching control, output H-bridges, including recirculation diodes. Voltage supply requirements logic motor. Maximum output current 500mA channel. NJM13775 achieved downsizing motor control board adopting small LQFP package, making this ideal multiple motor control board. PACKAGE OUTLINE
NJM13775FR3
FEATURES Dual chopper driver 350mA continuous output current channel Digital filter chip eliminates external filtering components Packages LQFP48
BLOCK DIAGRAM
Figure Block diagram Figure Block diagram
NJM13775
VMM1
CONFIGURATION
VMM2
Phase1
Figure configurations DESCRIPTION
16,17,18,19,20,24,37, 41,42,43,44,45 1,2,6,8,10,12,15,21,23, 26,28,30,31,33,35,38, 40,46 Symbol VMM1 Description Motor output channel Motor current flows from when Phase1 HIGH. Common emitter, channel This connects sensing resistor ground. Motor output channel Motor current flows from when Phase1 HIGH. Motor supply voltage, channel VMM1 VMM2 should connected together. Ground negative supply. Note: these pins used thermally heat-sinking. Make sure that ground pins soldered onto suitably large copper ground plane efficient heat sinking. Reference voltage, channel Controls comparator threshold voltage hence output current. Comparator input channel This input senses instantaneous voltage across sensing resistor, filtered internal digital filter optional external network. Controls direction motor current outputs MB1. Motor current flows from when Phase1 HIGH. Disable input channel When HIGH, four output transistors turned off, which results rapidly decreasing output current zero. Clock oscillator pin. Connect kohm resistor capacitor ground obtain nominal switching frequency 23.0 digital filter blanking time 1.0µs. Logic voltage supply, nominally Disable input channel When HIGH, four output transistors turned off, which results rapidly decreasing output current zero. Controls direction motor current outputs MB2. Motor current flows from when Phase2 HIGH. Comparator input channel This input senses instantaneous voltage across sensing resistor, filtered internal digital filter optional external network. Reference voltage, channel Controls comparator threshold voltage hence output current. Motor supply voltage, channel VMM1 VMM2 should connected together. Motor output channel Motor current flows from when Phase2 HIGH. Common emitter, channel This connects sensing resistor ground. Motor output channel Motor current flows from when Phase2 HIGH. connection.
Phase1 Dis1 Dis2 Phase2 VMM2
Phase2
Dis1
Dis2
NJM13775
ABSOLUTE MAXIMUM RATINGS Parameter
Voltage Logic voltage supply Motor voltage supply Logic Input voltage Analog Input voltage Current Motor output current Logic input current Analog input current Temperature Operating ambient temperature Operating junction temperature Storage temperature Power Dissipation 114.3mm 76.2mm 1.6mm, 2-phase, FR-4 mounted EIA/JEDC specified board 114.3mm 76.2mm 1.6mm, 4-phase, FR-4 mounted EIA/JEDC specified board Tstg -0.3 -0.3 -500 +500 +150 +150 Symbol
(TA=+25°C)
Unit
RECOMMENDED OPERATING Range
Parameter Logic supply voltage Motor supply voltage Output emitter voltage Motor output current Rise fall time logic inputs Oscillator timing resistor Symbol 4.75 -350
(Ta=+25°C)
5.25 +350 Unit
Figure Definition symbols
Figure Definition terms
NJM13775
ELECTRICAL CHARACTERISTICS
Parameter General Supply current1 Supply current2 Total power dissipation1 Total power dissipation2 Thermal shutdown junction temperature Turn-off delay Logic Inputs Logic HIGH input voltage Logic input voltage Logic HIGH input current Logic input current Analog Inputs Threshold voltage Input current |VC1-VC2| mismatch Motor Outputs Lower transistor saturation voltage Lower transistor leakage current Lower diode forward voltage drop Upper transistor saturation voltage Upper transistor leakage current Upper diode forward voltage drop Chopper Oscillator Chopping frequency Digital filter blanking time CT=4700 RT=12 CT=4700 21.5 23.0 24.5 IM=250mA Dis1=Dis2=H IM=250mA IM=250mA Dis1=Dis2=H IM=250mA 0.25 0.95 0.95 1.05 VCdiff VR=5V VR=5V VI=2.4V VI=0.4V -0.2 -0.1 ICC_1 ICC_2 PD_1 PD_2 TTSD dVC/dt 50mV/µs, IM=100mA fs=23.0kHz, Duty Cycle D=30% Dis1=Dis2=H VMM=24V, IM1=IM2=250mA fs=23.0kHz, Duty Cycle D=30% VMM=24V, IM1=350mA IM2=0mA fs=23.0kHz, Duty Cycle D=30% Symbol Conditions
(Tj=+25, VCC=5V, VMM=41V)
Unit
THERMAL CHARACTERISTICS
Parameter Junction ambient thermal resistance Junction case surface thermal resistance Junction ambient thermal resistance Junction case surface thermal resistance Symbol ja_1 Conditions EIA/JEDEC Specified board 114.3mm 76.2mm 1.6mm, 2-phase, FR-4 mounted EIA/JEDEC Specified board 114.3mm 76.2mm 1.6mm, 2-phase, FR-4 mounted EIA/JEDEC specified board 114.3mm 76.2mm 1.6mm, 4-phase, FR-4 mounted EIA/JEDEC specified board 114.3mm 76.2mm 1.6mm, 4-phase, FR-4 mounted 69.5 Unit °C/W
jt_1
°C/W
ja_2
41.7
°C/W
jt_2
°C/W
NJM13775
FUNCTIONAL DESCRIPTION Each channel NJM13775 consists following sections: output H-bridge with four transistors four recirculation diodes, capable driving 350mA continuous current motor winding, logic section that controls output transistors, flip-flop, comparator. clock-oscillator common both channels. Constant current control achieved switching output current windings. This done sensing peak current through winding current-sensing resistor effectively connected series with motor winding. current increases, voltage develops across sensing resistor, which back comparator. predetermined level, defined voltage reference input comparator resets flip-flop, which turns upper output transistor. turn-off channel independent other channel. current decreases until clock oscillator triggers flip-flops both channels simultaneously, which turns output transistors again, cycle repeated. prevent erroneous switching switching transients turn-on, NJM13775 includes digital filter. clock oscillator provides blanking pulse which used digital filtering voltage transient across current sensing resistor during turn-on. current paths during turn-on, turn-off phase shift shown figure
Figure Output stage with current paths during turn-on, turn-off phase shift.
NJM13775
APPLICATIONS INFORMATION Current control regulated output current level motor winding determined voltage reference input value sensing resistor, peak current through sensing resistor (and motor winding) expressed IM,peak With recommended value sensing resistor reference voltage will produce output current approximately should selected maximum motor current. sure exceed absolute maximum output current Chopping frequency, winding inductance supply voltage also affect current, much less extent. accurate current regulation, sensing resistor should -1.0 precision resistor, less than tolerance temperature coefficient. Constant Voltage Control Since there current detection, unnecessary. Therefore connect VR1, connect VCC. require RT(12k) CT(4700pF) reset inner flip-flop time turn-on.
Figure Typical stepper motor driver application with NJM13775.
4.7uF
410k
0.1uF
10uF
STEP Direction Half/Full Step RESET
STEP RESET
Dis1
Phase1 Dis1
VMM1 VMM2
7380 7380
NJM13775 NJM13775
Dis2
Phase2 Dis2 4700pF 0.47 0.47
STEPPER MOTOR
SGND
PGND
GND(VCC)
GND(VMM)
Figure Half stepping system where NJU7380 used controller circuit order generate necessary sequence NJM13775.
NJM13775
Current sense filtering turn-on current spike occurs from recovery recirculation diodes capacitance motor winding. clock oscillator generates blanking pulse turn-on prevent flip-flops from resetting through current sensing comparators current spike. blanking pulse disables comparators short time. Thereby voltage transient across sensing resistor will ignored during blanking time. Choose blanking pulse time longer than duration switching transients selecting proper value. time calculated value vary from approximately blanking time ranging from possible. Nominal value which gives blanking time filtering action introduces small delay, peak value across sensing resistor, hence peak motor current, will reach slightly higher level than what defined reference voltage. filtering delay also limits minimum possible output current. output will short time each cycle, equal digital filtering blanking time plus additional internal delays, amount current will flow through winding. Typically this current 1-10 maximum output current When optimizing current performance, filtering done adding external pass filter series with comparator input. this case digital blanking time should short possible. recommended filter component values kohm Lowering switching frequency also helps reducing minimum output current. create absolute zero current, input should HIGH. Switching frequency frequency clock oscillator timing components RC-pin. sets digital filter blanking time, clock oscillator frequency adjusted value limited kohm. frequency approximately calculated 0.77 Nominal component values 700pF results clock frequency 23.0 kHz. lower frequency will result higher current ripple, improve level linearity. higher clock frequency reduces current ripple, increases switching losses possibly iron losses motor.
Figure Stepping modes
NJM13775
Phase inputs logic HIGH Phase input gives current flowing from into logic gives current flow opposite direction. time delay prevents cross conduction H-bridge when changing Phase input. (Disable) inputs logic HIGH inputs will turn four transistors output H-bridge, which results rapidly decreasing output current zero. (Reference) inputs Vref inputs NJM13775 have voltage divider with ratio reduce external reference voltage adequate level. divider consists closely matched resistors. Nominal input reference voltage Interference switching operation NJM13775, noise transients generated might coupled into adjacent circuitry. reduce potential interference there basic rules follow: separate ground leads power ground (the ground connection RS), ground leads NJM13775, ground external analog digital circuitry. grounds should connected together close pins NJM13775. Decouple supply voltages close NJM13775 circuit. ceramic capacitor parallel with electrolytic type both VMM. Route power supply lines close together. place sensitive circuits close driver. Avoid physical current loops, place driver close both motor power supply connector. motor leads could preferably twisted shielded. Motor selection NJM13775 designed two-phase bipolar stepper motors, i.e. motors that have only winding phase. chopping principle NJM3775 based constant frequency varying duty cycle. This scheme imposes certain restrictions motor selection. Unstable chopping occur chopping duty cycle exceeds approximately figure definitions. avoid this, necessary choose motor with winding resistance inductance, i.e. windings with turns. possible motor that rated same voltage actual supply voltage. Only rated current needs considered. Typical motors used together with NJM13775 have voltage rating while supply voltage usually ranges from inductance, especially combination with high supply voltage, enables high stepping rates. However, give same torque capability speed, reduced number turns winding resistive, inductive motor must compensated higher current. compromise made. Choose motor with lowest possible winding resistance inductance, that still gives required torque, high supply voltage possible, without exceeding maximum recommended Check that chopping duty cycle does exceed maximum current. Thermal shutdown circuit equipped with thermal shutdown function that turns outputs chip (junction) temperature above 160°C. Normal operation resumed when temperature decreased. Programming Figure shows different input output sequences full-step, half-step modified half-step operations.
NJM13775
Full-step mode Both windings energized time with same current, IM2. make motor take step, current direction (and magnetic field direction) phase reversed. next step then taken when other phase current reverses. current changes through sequence four different states which equal four full steps until initial state reached again. Half-step mode half-step mode, current winding brought zero before complete current reversal made. motor will then have taken half steps equalling full step rotary movement. cycle repeated, other phase. total eight states sequenced until initial state reached again. Half-step mode overcome potential resonance problems. Resonance appear sudden loss torque more distinct stepping rates must avoided loose control motor's shaft position. disadvantage with half-step mode reduced torque half step positions, which current flows through winding only. torque this position approximately full step position torque. Modified half-step mode torque variations half step mode will eliminated current increased about times half-step position. constant torque will further reduce resonance mechanical noise, resulting better performance, life expectancy reliability mechanical system. Modifying current levels must done bringing reference voltage down) correspondingly from nominal value. This done using simple resistor divider networks. NJM13775 designed handle about times higher current channel mode, example 500mA full-step position, 700mA half-step position. Heat sink design Heat sink NJM13775 achieved soldering ground leads onto copper ground plane PCB. obtaining copper area PCB, ability transmitting heat away improved. Maximum continuous output current heavily dependent permissible loss ambient temperature. Consult figure (Typical Characteristics find maximum output current under varying conditions.
NP3773FR3 Current Consumption Characteristics (Topr=-40+85,Tj=150)
Power Dissipation
4-phaseFR4 mounted
2-phaseFR4 mounted
Ambient Temperature Ta()
Figure Ambient Temperature Current Consumption (Derating Curve)
NJM13775
TYPICAL CHARACTERISTICS
(Const. Voltage Drive)
(Const. Voltage Drive)
channels
channels
Pd[W] Pd[W]
channel
channel
IM[mA]
IM[mA]
(Const. Current Driv
(Const. Current Drive)
channels
channels
Pd[W]
Pd[W]
channel
channel
IM[mA]
IM[mA]
NJM13775
TYPICAL CHARACTERISTICS
ICC[mA]
VCC[V]
ICC[mA]
VCC[V]
VCC=VR=5V,DIS1=DIS2=5V,Ta=25oC
VCC=VR=5V,DIS1=DIS2=0V,Ta=25oC
IMM[mA]
IMM[mA]
VMM[V]
VMM[V]
NJM13775
TYPICAL CHARACTERISTICS
Vsat(upper) VCC=VR=5V,DIS1=DIS2=0V,Ta=25oC
Vsat(lower) VCC=VR=5V,DIS1=DIS2=0V,Ta=25oC
VMM=15V
VMM=41V
Vsat[V]
VMM=15V
Vsat[V]
VMM=41V
IM[mA]
IM[mA]
Vf(upper) Ta=25oC
Vf(lower) Ta=25oC
Vf[V] Vf[V]
IM[mA]
IM[mA]
[CAUTION] specifications this databook only given information without guarantee regards either mistakes omissions. application circuits this databook described only show representative usages product intended guarantee permission right including industrial rights.

DUAL STEPPER MOTOR DRIVER GENERAL DESCRIPTION NJM13775 switch-mod

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