Document
Star Connection/Delta Connection
SI-7600/SI-7600D
3-Phase Stepper Motor Driver ICs
sAbsolute Maximum Ratings
Parameter Load supply voltage Logic supply voltage Input voltage Reference input voltage Sense voltage Package power dissipation Junction temperature Operating temperature Storage temperature Symbol V BB VCC VIN V REF Vsense PD Tj Top Tstg Ratings 50 7 −0.3 to VCC −0.3 to VCC 1.5 1 −20 to +85 +125 −55 to +125 Units V V V V V W °C °C °C
sRecommended Operating Voltage Ranges
Parameter Load supply voltage Logic supply voltage Reference input voltage Symbol V BB VCC V REF Ratings 15 to 45 3 to 5.5 0.2 to Vcc−2
(Ta=25°C) Units V V V
sElectrical Characteristics
Parameter Load supply voltage Logic supply voltage Symbol VBB V CC VOL1 VOL2 VOH1 VOH2 IBB ICC VIH VIL IIH IIL F V Slow VMix V Fast IPFD VREF IREF V S1 V S2 IRC Toff −20 200 100 1.7 0.7 ±50 0 ±10 V REF×0.2 VREF×0.17 220 1.1×Rt ×Ct V CC−2 Ratings min 15 3.0 8 0 VBB−15 VBB−1 typ max 45 5.5 15 1 VBB−8 VBB 25 10 1.25 20 Units V V V V V V mA mA V V µA µA kHz VCC 1.3 0.3 V V V µA V µA V V µA Sec. Conditions
Output voltage
Load supply current Logic supply current Logic input voltage Logic input current Maximum clock frequency
VCC=5.5V VCC=5.5V
3.75
VIN=V CC×0.75 VIN=V CC×0.25 Edge=0V Edge=VCC
PFD input voltage PFD input current Reference input voltage Reference input current Sense voltage RC source current Off time
VREF=0~Vcc −2V Mode=VCC, VREF =0~VCC−2V Mode=0V, AVREF =0~VCC−2V
98
SI-7600/SI-7600D
3-Phase Stepper Motor Driver ICs (Star Connection/Delta Connection)
SI-7600/SI-7600D
sInternal Block Diagram/Diagram of Standard External Circuit
+ C7 C1 C3 Vcc VBB C4 C2 +
Clock CW/CCW
Control signal
OHA OHB OHC Control Logic PriBuffer OLA OLB OLC U V W
Reset F/H Ena Edge R5 Mode Vcc R1 REF 1/5 Buffer Current Control
Sense
MOS Array
Rs PFD RC GND ex. SLA5017 at 4A max SLA5059 at 4A max SLA5060 at 6A max Io SLA5061 at 10A max (Sanken) R5:10kΩ
C5
R2 Vcc
R3 C6 R4 Ct Rt
Reference constants Rs:0.1 to 1Ω (1 to 5W) Rt:15k to 75kΩ Ct:420p to 1100pF
C1:10 µ F/10V C2:100 µ F/63V C3 to C6:0.01 to 1 µ F C7:1000pF
R1+R2≤10kΩ (VREF:0.2 to VCC2-2V) R3+R4≤10kΩ (VPFD:0 to VCC2)
sTerminal Connection
The package shapes of SI-7600 and SI-7600D are different, however the terminal connection is the same.
PFD S Vcc Reset CW/CCW EDGE CK F/H Ena Mode
RC VBB OHA OHB OHA OLA OLB OLC GND REF
Pin No. Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7
Name PFD Sense Vcc Reset CW/CCW Edge Clock
Pin No. Pin8 Pin9 Pin10 Pin11 Pin12 Pin13 Pin14
Name Full/Half Enable Mode REF GND OLC OLB
Pin No. Pin15 Pin16 Pin17 Pin18 Pin19 Pin20
Name OLA OHC OHB OHA V BB RC
sExternal Dimensions (Unless specified otherwise, all values are typical)
SI-7600
12.6 20 20 11
(Units: mm)
SI-7600D
24.50 11
1
10
5.5
1 0.89 1.30
10
2.2 max
1.27 max 7.8
6.30
7.62
0.8 max
1.27
0.4
0.7
2.54 min 5.08 max
0.51 min
2.54
0.48 0° to 15°
0.25
SI-7600/SI-7600D
99
3-Phase Stepper Motor Driver ICs (Star Connection/Delta Connection)
SI-7600/SI-7600D
Application Notes
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 outputstage MOS FET according to the rated current of the motor. The full step is 2-phase excitation when this IC is in a star connection but 3-phase excitation when it is in a delta connection.
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 IO≅ VREF/(5×RS) When the Mode terminal level is high IO≅ VREF/(5×RS)→ 3-phase excitation IO≅ VREF/(5.88 ×RS)→ 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 reference voltage divider ratio deteriorates.)
2. Features
q Suitable for both star connection drive and delta connection drive q Maximum load supply voltage VBB =45V q Control logic supply voltage Vcc=3 to 5.5V q Supports star connection (2/2-3phase excitation) and delta connection (3/2-3phase excitation) q Step switching timing by clock signal input q Forward/reverse, hold, and motor-free control q Step switching at the positive edge or positive/negative edge of the clock signal q Control current automatic switching function for 2-3phase excitation (effective for star connection) (Current control: 86% for 2-phase excitation, 100% for 3-phase excitation) q Self-excitation constant-current chopping by external C/R q Slow Decay, Mixed Decay, or Fast Decay selectable q Two package lineup: SOP (surface mounting) and DIP (lead insertion) SOP…SI-7600, DIP …SI-7600D q Maximum output current depends on the ratings of the MOS FET array used
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 .