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STK672-050-E Datasheet(PDF) 16 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) 16 Page - Sanyo Semicon Device

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STK672-050-E
No.5228-16/19
Thermal Design
<Hybrid IC Average Internal Power Loss Pd>
The main elements internal to this hybrid IC with large average power losses are the current control devices, the
regenerative current diodes, and the current detection resistor. Since sine wave drive is used, the average power loss
during microstepping drive can be approximated by applying a waveform factor of 0.64 to the square wave loss during
2 phase excitation.
The losses in the various excitation modes are as follows.
2 phase excitation
Pd2EX = (Vsat+Vdf) ·
· IOH · t2 +
· (Vsat · t1+Vdf · t3)
1-2 phase excitation
Pd1-2EX = 0.64 · {(Vsat+Vdf) ·
· IOH · t2 +
· (Vsat · t1+Vdf · t3)}
W1-2 phase excitation
PdW1-2EX = 0.64 · {(Vsat+Vdf) ·
·IOH · t2 +
· (Vsat · t1+Vdf · t3)}
2W1-2 phase excitation Pd2W1-2EX = 0.64 · {(Vsat+Vdf) ·
·IOH · t2 +
· (Vsat · t1+Vdf · t3)}
4W1-2 phase excitation Pd4W1-2EX = 0.64 · {(Vsat+Vdf) ·
·IOH · t2 +
· (Vsat · t1+Vdf · t3)}
Here, t1 and t3 can be determined from the same formulas for all excitation methods.
t1 =
· n (1 –
· IOH)
t3 =
· n (
)
However, the formula for t2 differs with the excitation method.
2 phase excitation
t2 =
– (t1+t3)
1-2 phase excitation
t2 =
– t1
W1-2 phase excitation
t2 =
– t1
2W1-2 phase excitation
t2 =
– t1
4W1-2 phase excitation
Motor Phase Current Model Figure (2 Phase Excitation)
fclock : CLK input frequency (Hz)
Vsat
: The voltage drop of the power MOSFET and the current detection resistor (V)
Vdf
: The voltage drop of the body diode and the current detection resistor (V)
IOH
: Phase current peak value (A)
t1
: Phase current rise time (s)
VCC1 : Supply voltage applied to the motor (V)
t2
: Constant-current operating time (s)
L
: Motor inductance (H)
t3
: Phase switching current regeneration time (s)
R
: Motor winding resistance (
Ω)
2
fclock
2
fclock
OH
I
·
4
fclock
4
fclock
OH
I
·
8
fclock
8
fclock
OH
I
·
16
fclock
16
fclock
OH
I
·
16
fclock
16
fclock
OH
I
·
0.48
R
L
+
1
CC
V
0.48
R
+
R
L
0.48
1
CC
V
·R
OH
I
0.48
1
CC
V
+
+
+
fclock
2
fclock
3
fclock
7
fclock
15
t3
t1
t2
IOH
A12414


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