5-Phase Stepper Motor Driver
Description
5-phase Stepper Motor Star Connection Unipolar Driver IC
SI-7500A
s Ratings
Absolute maximum rating Type No.
SI-7500A Supply voltage (V) VCC 40 Vb 8 Output current (A) Io 1.
2 Junction temperature (°C) Tj +125 Operating ambient temperature (°C) Top –20 to +80 (Ta = 25 °C) Storage temperature (°C) Tstg –30 to +100
s Characteristics
Electrical characteristics Vb input External *Input voltage *Input current zener diode current breakdown voltage (V) (mA/ø) (%) (mA) (V) (V) (mA) VCC Vb IO I OPD/IO Ib VZ V IH1 V IH2 VIL IIH1 I IH2 min typ max min typ max min typ max min typ max max min max max max max max max 17 24 30 4.
5 5 5.
5 200 750 1000 35 50 100 15 VCC x1.
5 50 3.
9 1.
3 0.
6 0.
21 0.
22 Operating supply voltage Output current Power down Ratio Trigger pulse voltage (V) Vtrig min max 4.
0 Vb Trigger pulse time
(Ta = 25 °C) Trigger pulse frequency (kHz) Ftrig typ max 20 25
Type No.
SI-7500A
(µ s) Ttrig min typ 1.
0 2.
0
s Block diagram
Main power supply VCC Auxiliary power supply Vb Variable current resistor Excitation signal 2-3 phase excitation
Reference voltage Comparator amplifier Current controller Excitation signal amplifier
Zener diode for canceling counter EMF
ZD
Rx
Trigger pulse generator circuit
M
Counter EMF Canceller
* Input voltage and input current conditions VIH1 : Vb = 5V, Q1 to Q5ON RX = , I IN = 0.
2mA VIH2 : Vb = 5V, Q1 to Q5OFF, IIN = 0.
22mA IIH1 : Vb = 5V, Q1 to Q5ON, VIN = 3.
7V IIH2 : Vb = 5V, Q1 to Q5OFF, VIN = 0.
9V
SI-7500A
Current detection resistor Rs
s Equivalent circuit diagram
w q @0
Q6 R36 D11 D6 R46 R1 R6 D1 Q11 R11 Q1 R47 R26 R16 R21 R31 R32 R41 MIC1 R37 R7 R42 Q7 R2 Q12 D2 R12 R17 R22 R27 R28 Q2 D12 D7 D13 D8 R3 D3 Q13 R13 Q3 R18 R23 R34 R19 R24 R29 R30 Q8 R38 R8 R43 R44 R39 Q9 R9 R4 Q14 D4 R14 Q4 Q5 D14 D15 R5 D5 Q15 R15 Q10 R40 R10 R45 MIC3 R20 R25 R35
ri
t
o
!2 !5
!3
!6
!9
u
D9 D10
!8 e y !0 !1 !4 !7
43
SI-7500A
s Diagram of external circuits
SI-7500A
VCC
+
5-phase stepper motor
100 µ F 50V
ZD
1
ZD
20
VCC
2
OUT-1...
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