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LB1661 データシート(PDF) 7 Page - Sanyo Semicon Device |
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LB1661 データシート(HTML) 7 Page - Sanyo Semicon Device |
7 / 9 page (4) Lock detect threshold voltage The LB1660 series have the function to stop the output drive after the lapse of a given period of time when a motor is locked, and period of time can be set by C, R3. The CR pin peripheral equivalent circuit is shown below. The LB1660 series generate the CR pin discharge pulse when the phase changes, (detection of rotation). When a motor is locked (very low rotational speed), the C connected to the CR pin stops discharging and the CR pin voltage rises. When the CR pin voltage exceeds the threshold voltage (VIN × 0.8), the output drive current becomes zero and the output transistor is turned off, and the RD pin output turns from ‘‘L’’ to ‘‘H’’. The RD pin output is of the open collector type. CR Pin Peripheral Circuit [Setting Method of Lock Detect Time] (1) Generation of discharge pulse Electric charges on C charged through R3 are discharged via route of C → r → TRr with constant width pulses at each phase change. When a fan has a high rotational speed, a lot of discharge pulses are generated and the CR pin voltage (=VCR) drops. By contrast, when a fan has a low rotational speed, VCR rises and the protector is operated. The discharge pulses are generated by two methods as shown below. 1 Generated internally at the time of phase change. The power transistor base storage time is used for discharge pulses. t = 15 to 30 µsec 2 When the kickback voltage induced by L of a motor coil is absorbed by the zener diode across collector and base of the output transistor, this interval of time during which the transistor is turned on is used for discharge pulses. Therefore, the LB1661,1665 or LB1660N, 1664N use external zener diodes and capacitors, discharge occurs with pulses of 1 only and VCR voltage gets higher than the circuit generating discharge pulses of 2 even if the CR time constant is the same. Output transistor drive Discharge pulse CR pin voltage RD pin Motor lock Output off 0.8 c VIN LB1660N, 1661, 1664N, 1665 No.2551-7/9 |
同様の部品番号 - LB1661 |
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同様の説明 - LB1661 |
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