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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM9800GSTR-G1 데이터시트(PDF) 9 Page - Diodes Incorporated |
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AM9800GSTR-G1 데이터시트(HTML) 9 Page - Diodes Incorporated |
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9 / 11 page  Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Sep. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Application Information (Continued) Figure 11. Rotation Mode Waveform (PWM Mode) (f=25kHz, VH=5V, VL=0V, Duty Cycle=50%) 8. Soft Switching Circuit AM9800 adopts variable duty soft switching to minimize the motor drive noise. Figure 12 shows how soft switching circuit works during the fan rotation. Figure 12. Soft Switching Waveform 9. Current Limiter Circuit The driver current is detected by connecting a resistor between RF pin (pin 15) and ground. The current limiter circuit limits the output current peak value to a level determined by the equation I=VRF/RF (VRF=0.25V typical). 10. OSC Circuit A capacitor must be connected between OSC pin (Pin 7) and ground. When a capacitor is connected, the OSC pin starts self-oscillation, and its frequency becomes the startup frequency. Figure 13 shows a fan system’s OSC Waveform. Figure 13. OSC Waveform (COSC=2200pF) 11．Position Detector Comparator Circuit for Rotor The position detector comparator circuit for the rotor is a comparator for detecting rotor positional information with the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies current to the motor based on the position information obtained here. A capacitor (between 1000 and 10000pF) must be connected between COMIN pin (pin 5) and the FIL pin (pin 6) to prevent any motor startup misoperation that is caused by the comparator input noise. 12．FG Output Circuit FG output pin (pin 10) provides a pulse signal equivalent to what provided by systems using a Hall-effect sensor. A pull-up resistor (10kΩ is recommended) must be connected between FG pin and the power supply. Figure 14 shows the FG output signal when the fan rotates. Figure 14. FG Output Signal 13. Lock Shutdown and Auto Restart This IC detects the rotation of the motor by internal circuit block, and adjusts lock detection ON time (tON) and lock detection OFF time (tOFF) by internal counter. tON and tOFF are shown as below: Figure 15. Lock Mode VUO 5V/div VVO 5V/div VWO 5V/div -IWO 100mA/div Time 5ms/div VUO 5V/div VVO 5V/div VWO 5V/div -IWO 200mA/div Time 200 µs/div VUO 5V/div VVO 5V/div VFG 5V/div VOSC 100mV/div Time 500 µs/div Time 5ms/div Time 1s/div VUO 5V/div VVO 5V/div VWO 5V/div |
유사한 부품 번호 - AM9800GSTR-G1 |
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유사한 설명 - AM9800GSTR-G1 |
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