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STK672-050GEVB 数据表(PDF) 8 Page - ON Semiconductor |
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STK672-050GEVB 数据表(HTML) 8 Page - ON Semiconductor |
8 / 19 page STK672-050-E No.5228-8/19 Functional Description External Excitation Chopper Drive Block Description Driver Block Basic Circuit Structure Since this hybrid IC adopts an external excitation method, no external oscillator circuit is required. When a high level is input to φA in the basic driver block circuit shown in the figure and the MOSFET is turned on, the comparator + input will go low and the comparator output will go low. Since a set signal with the PWM period will be input, the Q output will go high, and the MOSFET will be turned on as its initial value. The current ION flowing in the MOSFET passes through L1 and generates a potential difference in Rs. Then, when the Rs potential and the Vref potential become the same, the comparator output will invert, and the reset signal Q output will invert to the low level. Then, the MOSFET will be turned off and the energy stored in L1 will be induced in L2 and the current IOFF will be regenerated to the power supply. This state will be maintained until the time when an input to the latch circuit set pin occurs. In this manner, the Q output is turned off and on repeatedly by the reset and set signals, thus implementing constant current control. The resistor and capacitor on the comparator input are spike removal circuit elements and synchronize with the PWM frequency. Since this hybrid IC uses a fixed frequency due to the external excitation method and at the same time also adopts a synchronized PWM technique, it can suppress the noise associated with holding a position when the motor is locked. Input Pin Functions Pin No. Symbol Function Pin circuit type 14 CLK Phase switching clock Built-in pull-up resistor CMOS Schmitt trigger input 15 CWB Rotation direction setting (CW/CCW) Built-in pull-up resistor CMOS Schmitt trigger input 17 RETURN Forced phase origin return Built-in pull-up resistor CMOS Schmitt trigger input 18 ENABLE Output cutoff Built-in pull-up resistor CMOS Schmitt trigger input 9, 10, 11 M1, M2, M3 Excitation mode setting Built-in pull-up resistor CMOS Schmitt trigger input 12, 13 M4, M5 Vector locus setting Built-in pull-up resistor CMOS Schmitt trigger input 16 RESET System reset Built-in pull-up resistor CMOS Schmitt trigger input 8 Vref Current setting Operational amplifier input ITF02398 D1 Rs L2 VCC1 IOFF L1 φA φA MOSFET AND Q S R 800kHz 45kHz Latch circuit Noise filter CR oscillator Divider Current divider M4 M5 Vref A=1 + – Enable φA (control signal) ION |
类似零件编号 - STK672-050GEVB |
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类似说明 - STK672-050GEVB |
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