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SI-7600D 数据表(PDF) 3 Page - Sanken electric |
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SI-7600D 数据表(HTML) 3 Page - Sanken electric |
3 / 5 page 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 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 ex- citation (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 3. Input Logic Truth Table Input terminal Low level High level CW/CCW CW CCW Full/Half 2-3phase excitation 2-phase excitation Enable Disable Enable Mode Always 100% 2-phase excitation: 85% (Note 1) 3-phase excitation: 100% Edge Positive Positive/negative (Note 2) Reset Enable Internal logic reset (Note 3) 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 VREF/(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 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 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 TOFF ≅1.1×Ct×Rt…… (1) The recommended range of constant Ct/Rt is as follows: Ct: 420 to 1100pF Rt: 15 to 75k Ω (Slow Decay or Mixed Decay →560pF/47kΩ, Fast Decay → 470pF/20k Ω) Usually, set TOFF 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 Decay mode 0 to 0.3V Fast Decay 0.7V to 1.3V Mixed Decay 1.7V to Vcc 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 VPFD. 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 (VPFD) when chopping is turned from ON to OFF. The Fast Decay time is ……(2) The Slow Decay time (tOFFs) is calculated by subtracting the value of (2) from that of (1). tOFFS ≅TOFF−tOFFf ……(3) Application Notes tOFFf ≅−RT×CT×ln ( ) VPFD 1.5 |
类似零件编号 - SI-7600D |
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类似说明 - SI-7600D |
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