STK6712BMK4 Sanyo Semicon Device, STK6712BMK4 Datasheet
STK6712BMK4
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STK6712BMK4 Summary of contents
Page 1
... Ordering number : EN4867A Overview The STK6712BMK4 is a unipolar fixed-current chopper- type 4-phase stepping motor driver hybrid IC (HIC) which uses a MOSFET power device. The excitation sequence signal is active low. Applications • Serial printer, line printer, and laser beam printer (LBP) paper feed and carriage motor drivers • ...
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... TTL input ON voltage V IH TTL input OFF voltage Switching time t OFF Note: With constant voltage power supply. Internal Equivalent Circuit STK6712BMK4 Symbol Conditions V 1 max No input signal max No input signal CC per phase, R Ω, 10 mH, 0 pulse max ...
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... K ≈ 1 ≈ 0.33 Ω ± reduce noise during motor hold possible to mount C not required. STK6712BMK4 Circuit Operation Fig. 1 STK6712BMK4 Internal Equivalent Circuit STK6712BMK4 Output current waveform when phases are held (locked) Measure output current values in this state 390 Ω. ...
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... The operation for a 4-phase dual-excitation example is described below. The STK6712BMK4 equivalent circuit is given in Fig. 1. The circuit consists of the phase drivers, the comparator, the PWM excitation select and the current detect resistance. In Fig. 1 øA is input with low, and øA with high. When Q1 ...
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... Waveform Timing Charts Control Logic Timing Chart 1. 2-phase excitation STK6712BMK4 Fig. 2 No. 4867-5/10 ...
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... A or lower note that the HIC GND pattern will be one-point earth with respect to the power OH supply. If earth is poor, there may be no motor current when I range mH. STK6712BMK4 STK6712BMK4 Excitation Circuit Fig. 3 Output Motor Current Waveform 2. O Fig. 4 Vref Peripheral Circuit = 0 ...
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... ON OFF Because the STK6712BMK4 is self-exciting there will be minor variation in motor inductance during motor revolution. Final design verification is required in an actual model. Thermal Radiation Design The HIC radiator plate size is dependent on the motor output current I mode, and excitation input signal clock frequency fclock (Hz). ...
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... Fig. 5 HIC Internal Mean Power Dissipation Pd The internal mean power dissipation of the STK6712BMK4 is primarily due to the current control device, the regenerating current diode, the current detect resistance and the predriver circuit. Loss in each excitation mode is: ...
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... F = 3fclock/ (1/F) – t1.................................................................................. (15) fclock: 4-phase divider input oscillation frequency The characteristic diagrams (typ) for I Fig. 8 STK6712BMK4 No Thermal Radiation Range (example) An example of STK6712BMK4 use in the no-fin state is indicated below. Conditions stepping motor: Electrical characteristics 3.5 mH/ø, 3.5 Ω/ø • Motor supply voltage V CC • ...
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... Motor hold noise countermeasures The STK6712BMK4 executes constant current chopping outside the audible range. During motor hold the current hold is outside the range of audible frequencies, but for motors of sizes square (when seen from the shaft direction) with inductance of about 15 mH, there are cases where the output noise is converted to low-frequency noise ...