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MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54646AP is a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to a designated current level.
PIN CONFIGURATION (TOP VIEW)
FEATURES
q Wide driver voltage range (10 - 40V) q Wide output current control range (20 - 800mA) q Bipolar and constant current control q Built-in flywheel diode q Built-in thermal protection circuit
Comparator input (1) C1 Comparator reference VR1 voltage input (1) Output stage VMM1 supply voltage (1) Output terminal (1) MA1 Current sensor (1)
1 2 3 4
28 C2 27 VR2
Comparator input (2)
Comparator reference voltage input (2) 26 VMM2 Output stage supply voltage (2) 25 MA2 Output terminal (2) 24 E2 23 22 GND 21 20 19 MB2 Output terminal (2) 18 VMM2 Output stage supply voltage (2) 17 VCC2 Power supply (2) One-shot multi 16 T2 time constant 15 Ph2 Output current direction switch Current sensor (2)
E1 5 6
M54646AP
APPLICATION
Office automation equipment such as printers, FDDs, HDDs and facsimiles
GND
7 8 9
FUNCTION
M54646AP Integrated Circuit drives two-phase bipolar stepper motors while controlling winding current: It controls winding current direction by inputting phases (pins 14 and 15) and, at the same time, controls winding current amperage with terminals VR (pins 2 and 27 ). Provided with control circuits that output two phases, this IC is sufficient to drive a two-phase bipolar stepper motor.
Output terminal (1) MB1 10 Output stage VMM1 supply voltage ((1) Power supply (1) VCC1 One-shot multi T1 time constant Output current Ph1 direction switch 11 12 13 14
Outline 28P4B
BLOCK DIAGRAM
Output stage supply voltage (2) Output stage supply voltage (1) Comparator reference voltage input (2) Comparator reference voltage input (1) Output current direction switch Direction switch output current Output terminal (2) Output terminal (1) MA1
4
VR2
27
Ph2
15
MA2
25
MB2
19
VMM2
18
VR1
2
Ph1
14
VMM1
3
MB1
10
1 Power supply (1) VCC1 12
1
1
1
1
1 Power supply (2) 17 VCC2
1
1
1
1
TSD
Monostable tOFF = 0.69 * RT * CT Current sensor
20 21 22 23 28 16 24 6789 1
Monostable tOFF = 0.69 * RT * CT Current sensor
13 5
GND
C2 Comparator input (2)
T2 One-shot multi time constant
E2 Current GND sensor
C1 Comparator input (1)
T1 One-shot multi time constant (1)
E1 Current sensor (1)
MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS (Ta = 25C unless otherwise noted)
Symbol VCC VMM VL VC VR IL IC IO Pd Topr Tstg Parameter Supply voltage Output stage supply voltage Logic input voltage Analog input voltage Reference input voltage Logic input current Analog input current Output current Power dissipation Operating temperature Storage temperature Conditions Ratings -0.3 - 7 -0.3 - 45 -0.3 - 6 -0.3 - VCC -0.3 - 15 -10 -10 1000 1.92 -20 - 85 -55 - 125 Unit V V V V V mA mA mA W C C
Measured with IC mounted on board
RECOMMENDED OPERATIONAL CONDITIONS (Ta = 25C unless otherwise noted)
Symbol VCC VMM IO tPLH tPHL TON Parameter Supply voltage Output stage supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature Min. 4.5 10 20 Limits Typ. 5 Max. 5.5 40 800 2 2 Unit V V mA s s C
165
ELECTRICAL CHARACTERISTICS (VCC = 5V, Ta = 25C unless otherwise noted)
Symbol VIH VIL ICH ICO IOFF Vsat tOFF td ICC IIH IIL Parameter "H" "L" Comparator threshold voltage Comparator input current Output cutoff current Logic input voltage Total saturation voltage Cutoff time Turn-off delay Power current Logic input current "H" "L" VCC = 5V VR = 5V Test Conditions Min. 2.0 0 400 -20 Limits Typ. Max. VCC 0.8 450 20 100 3.5 25 30 1.6 35 2.0 25 20 Unit V V mA A A V s s mA A mA
430
Sensing resistance is not included. (IO = 500mA) VMM = 10V, tON 5s dVK/dt 50mV/s VCC = 5V, 1 phase VI = 2.4V VI = 0.4V
-0.4
MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
SWITCHING CHARACTERISTICS SWITCHING WAVEFORM
VMA - VMB or VMB - VMA tOFF=0.69 * RT * CT 1
APPLICATION DIRECTIONS
(1) Phase input Phase input determines output mode: PHASE H L MA H L MB L H
1/2
tON
tOFF
(2) VR (reference voltage) Stepless current level variation is available by continuously changing VR. (3) Current sensor Compares voltage converted from amperage by current sensing resistor to designated reference voltage level. When they are the same, comparator triggers Mono-stable, and shuts off output transistor during time frame tOFF. During this period, current level decreases to slightly below reference level. When period has passed, output transistor is reactivated. This series of operations is repeated. (4) Single-pulse generator Mono-stable is triggered at comparator output phase rise edge. Mono-stable output pulse width is determined by input to timing terminals RT and CT, as follows: tOFF = 0.69 x RT x CT If new trigger occurs during tOFF, it is ignored. (5) Analog control Stepless output current level variation is available by continuously changing voltage VR or feedback voltage to comparator.
td VE VCH
TIMING CHART
Two-phase excitation Phase 1
Phase 2
MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
AREA OF SAFE OPERATION
1.0
OUTPUT CURRENT Io (A)
0.8 B 0.6
A: Recommended operational range B: External Schottky diode to be connected between output terminal and power terminal as well as between output terminal and GND.
V
0.4 A 0.2 B
This regulation is for temporary electric power use. For continuous use, be sure power dissipation does not go beyond package's operational range.
0
0
10
20
30
40 45 50
DRIVER VOLTAGE VMM (V)
THERMAL DERATING
10.0
POWER DISSIPATION (W)
8.0
6.0
C
4.0 B 2.0 A
j-c = 8C/W A: Mounted on 25cm2 glassfiber epoxy resin circuit board with one side copper-foiled c-a = 42C/W B: With aluminum heat sink (1t) 10cm2 c-a = 25C/W C: With aluminum heat sink (1t) 100cm2 c-a = 10C/W Tj(max) = 150C
0
0
25
50
75
100
AMBIENT TEMPERATURE (C)
MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
APPLICATION EXAMPLE
CC1 1 2 3 RC1 4 5 6 MA1 E1 MA2 E2 25 C1 VR1 VMM1 C2 VR2 VMM2 28 27
CC2
24V 26 RC2 47F 24 23
M54646AP
RS1
7 GND 8 9 10 11 12 MB1 VMM1 VCC1 T1 Ph1
22 GND 21 20 MB2 VMM2 VCC2 T2 Ph2 19 18 17
RS2
5V CT2
CT1 13 RT1 14 Phase1 15 Phase2 16
RT2
Stepper motor
RS1, RS2 = 1 RC1, RC2 = 1k CC1, CC2 = 820F RT1, RT2 = 56k CT1, CT2 = 820F
MITSUBISHI
M54646AP
2-PHASE STEPPER MOTOR DRIVER
CAUTION
(1) Be sure to short-circuit VCC1 and VCC2 before use. (2) When IC total output current changes greatly, e.g. when output current flows intermittently due to thermal protection operation, supply voltage may fluctuate. Provide power supply and wiring such that even in such a case amperage will not exceed absolute maximum rating. (3) Excessive power voltage fluctuations may cause unstable IC operation. To regulate such fluctuations, connect capacitor between terminals VCC and GND as close to IC terminal as possible. (Refer to application example.) (4) Thermal protection function * Thermal protection characteristics may differ depending on wiring layout. Be sure to test IC on circuit board before use. After circuit board is replaced, test IC again. * Circuit boards on which this IC mounted are designed such that impedance between power supply and output terminal will be kept low; therefore, IC output terminal may be shortcircuited internally if excessive surge voltage is applied accidentally from outside. To prevent circuit board from burning in such a case, take safety measures such as installation of a fuse. (5) Flywheel diode This IC has built in flywheel diode to provide a return current route to motor. To prevent overheating and malfunction in operational areas where great current and voltage are applied, install a Schottky diode externally. For details, refer to "Area of Safe Operation" and "Application Example."
.

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