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AM4967GS-G1 Datasheet(PDF) 10 Page - BCD Semiconductor Manufacturing Limited |
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AM4967GS-G1 Datasheet(HTML) 10 Page - BCD Semiconductor Manufacturing Limited |
10 / 15 page ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967 Preliminary Datasheet 10 Jun. 2008 Rev. 1. 1 BCD Semiconductor Manufacturing Limited Operating Diagram Note 3: 1. Minimum Speed Setting Mode (Stop Mode) When fan rotate at low speed, its lowest speed is settable by VMIN pin voltage. If not, fan motor stops. 2. Low Speed to High Speed Setting Mode PWM control system works by comparing the voltage of VPWM and COSC (1.0V to 3.0V). When VPWM voltage is low, the transistors of the upper and lower side outputs are ON. On contrary, when VPWM voltage is high, the upper side transistors are OFF. And coil current re-circu- lates in a lower side transistor. Therefore, as the VPWM voltage becomes lower, output ON duty becomes large. Sequentially, coil current increases and the motor runs at high speed which is monitored by FG output while rota- tion-stop state is monitored by RD output. 3. Full Speed Rotation Mode When VPWM voltage drops to 1.0V or lower, motor fan will run at full speed. (If the speed is not controlled, VPWM=GND) Figure 9. Operating Diagram 1 of AM4967 (Speed Control, Note 3) VPWM Voltage f OSC=30kHz (COSC=220pF) VMIN Voltage COSC Voltage 0V Minimum Speed Setup Rotation (Stop Mode) Low Speed PWM Adjustable Speed High Speed Full Speed FG ON-Duty-Large ON-Duty-Small 3.0V 1.0V RPM |
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