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參數(shù)資料
| 型號(hào)： | SI-7600D |
| 廠商： | SANKEN ELECTRIC CO LTD |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 3-Phase Stepper Motor Driver ICs |
| 中文描述： | STEPPER MOTOR CONTROLLER, PDIP20 |
| 封裝： | DIP-20 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 41K |
| 代理商： | SI-7600D |
100
SI-7600/SI-7600D
3-Phase Stepper Motor Driver ICs (Star Connection/Delta Connection)
SI-7600/SI-7600D
1. Outline
The SI-7600/SI-7600D is a control IC used with a power MOS
FET array to drive a 3-phase stepper motor. Select the output-
stage MOS FET according to the rated current of the motor.
The full step is 2-phase excitation when this IC is in a star con-
nection but 3-phase excitation when it is in a delta connection.
2. Features
G
Suitable for both star connection drive and delta connection drive
G
Maximum load supply voltage V
BB
=45V
G
Control logic supply voltage Vcc=3 to 5.5V
G
Supports star connection (2/2-3phase excitation) and delta
connection (3/2-3phase excitation)
G
Step switching timing by clock signal input
G
Forward/reverse, hold, and motor-free control
G
Step switching at the positive edge or positive/negative edge
of the clock signal
G
Control current automatic switching function for 2-3phase ex-
citation (effective for star connection)
(Current control: 86% for 2-phase excitation, 100% for 3-phase
excitation)
G
Self-excitation constant-current chopping by external C/R
G
Slow Decay, Mixed Decay, or Fast Decay selectable
G
Two package lineup: SOP (surface mounting) and DIP (lead
insertion)
SOP
…
SI-7600, DIP
…
SI-7600D
G
Maximum output current depends on the ratings of the MOS
FET array used
3. Input Logic Truth Table
Input terminal
CW/CCW
Full/Half
Enable
Mode
(Note 1)
Edge
(Note 2)
Reset
(Note 3)
Low level
CW
High level
CCW
2-phase excitation
Enable
2-phase excitation: 85%
3-phase excitation: 100%
2-3phase excitation
Disable
Always 100%
Positive
Positive/negative
Enable
Internal logic reset
output disable
Select CW/CCW, Full/Half, or Edge when the clock level is low.
Note 1:The control current is always 85% for the full step (2-
phase excitation) when the Mode terminal level is high.
The value of 100% control current is calculated at the
V
REF
/(5
×
Rs) terminal because a 1/5 buffer is built into
the reference section.
Note 2:When the Edge terminal level is set high, the internal
counter increments both at the rising and falling edges.
Therefore, the duty ratio of the input clock should be set
at 50%.
Note 3:When the Reset terminal level is set high, the internal
counter is reset. Output remains disabled as long as the
Reset terminal level is high.
4. Determining the control current
The control current Io can be calculated as follows:
When the Mode terminal level is low
I
O
V
REF
/(5
×
R
S
)
When the Mode terminal level is high
I
O
V
REF
/(5
×
R
S
)
→
3-phase excitation
I
O
V
REF
/(5.88
×
R
S
)
→
2-phase excitation
The reference voltage can be set within the range of 0.2V to Vcc
2V.
(When the voltage is less than 0.2V, the accuracy of the refer-
ence voltage divider ratio deteriorates.)
5.About the Current Control System (Setting the
Constant Ct/Rt)
The SI-7600 uses a current control system of the self-excitation
type with a fixed chopping OFF time.
The chopping OFF time is determined by the constant Ct/Rt.
The constant Ct/Rt is calculated by the formula
T
OFF
1.1
×
Ct
×
Rt
……
(1)
The recommended range of constant Ct/Rt is as follows:
Ct: 420 to 1100pF
Rt: 15 to 75k
(Slow Decay or Mixed Decay
→
560pF/47k
, Fast Decay
→
470pF/20k
)
Usually, set T
OFF
to a value where the chopping frequency be-
comes about 30 to 40kHz.
The mode can be set to Slow Decay, Fast Decay, or Mixed De-
cay depending on the PFD terminal input potential.
PFD applied voltage and decay mode
PFD applied voltage
0 to 0.3V
0.7V to 1.3V
1.7V to Vcc
Decay mode
Fast Decay
Mixed Decay
Slow Decay
In Mixed Decay mode, the Fast/Slow time ratio can be set using
the voltage applied to the PFD terminal. The calculated values
are summarized below.
In this mode, the point of switching from Fast Decay to Slow
Decay is determined by the RC terminal voltage that determines
the chopping OFF time and by the PFD input voltage V
PFD
.
Formula (1) is used to determine the chopping OFF time.
The Fast Decay time is then determined by the RC discharge
time from the RC voltage (about 1.5V) to the PFD input voltage
(V
PFD
) when chopping is turned from ON to OFF.
The Fast Decay time is
V
1.5
……
(2)
t
OFFf
R
T
×
C
T
×
l
n
( )
The Slow Decay time (t
OFFs
) is calculated by subtracting the value
of (2) from that of (1).
t
OFFS
T
OFF
t
OFFf
……
(3)
Application Notes
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