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STK672-050-E Datasheet(PDF) 8 Page - Sanyo Semicon Device

Part No. STK672-050-E
Description  Stepping Motor Driver (sine wave drive) Output Current 3.0A (no heat sink*)
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK672-050-E Datasheet(HTML) 8 Page - Sanyo Semicon Device

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STK672-050-E
No.5228-8/19
Functional Description
External Excitation Chopper Drive Block Description
Driver Block Basic Circuit Structure
Since this hybrid IC adopts an external excitation method, no external oscillator circuit is required.
When a high level is input to
φA in the basic driver block circuit shown in the figure and the MOSFET is turned on, the
comparator + input will go low and the comparator output will go low. Since a set signal with the PWM period will be
input, the Q output will go high, and the MOSFET will be turned on as its initial value.
The current ION flowing in the MOSFET passes through L1 and generates a potential difference in Rs. Then, when the
Rs potential and the Vref potential become the same, the comparator output will invert, and the reset signal Q output
will invert to the low level. Then, the MOSFET will be turned off and the energy stored in L1 will be induced in L2 and
the current IOFF will be regenerated to the power supply. This state will be maintained until the time when an input to
the latch circuit set pin occurs.
In this manner, the Q output is turned off and on repeatedly by the reset and set signals, thus implementing constant
current control. The resistor and capacitor on the comparator input are spike removal circuit elements and synchronize
with the PWM frequency. Since this hybrid IC uses a fixed frequency due to the external excitation method and at the
same time also adopts a synchronized PWM technique, it can suppress the noise associated with holding a position
when the motor is locked.
Input Pin Functions
Pin No.
Symbol
Function
Pin circuit type
14
CLK
Phase switching clock
Built-in pull-up resistor CMOS Schmitt trigger input
15
CWB
Rotation direction setting (CW/CCW)
Built-in pull-up resistor CMOS Schmitt trigger input
17
RETURN
Forced phase origin return
Built-in pull-up resistor CMOS Schmitt trigger input
18
ENABLE
Output cutoff
Built-in pull-up resistor CMOS Schmitt trigger input
9, 10, 11
M1, M2, M3
Excitation mode setting
Built-in pull-up resistor CMOS Schmitt trigger input
12, 13
M4, M5
Vector locus setting
Built-in pull-up resistor CMOS Schmitt trigger input
16
RESET
System reset
Built-in pull-up resistor CMOS Schmitt trigger input
8
Vref
Current setting
Operational amplifier input
ITF02398
D1
Rs
L2
VCC1
IOFF
L1
φA
φA
MOSFET
AND
Q
S
R
800kHz
45kHz
Latch circuit
Noise
filter
CR
oscillator
Divider
Current
divider
M4
M5
Vref
A=1
+
Enable
φA (control signal)
ION


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