lb8500m Sanyo Semiconductor Corporation, lb8500m Datasheet
lb8500m
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lb8500m Summary of contents
Page 1
... Compared to open-loop control, the use of speed feedback allows the motor speed precision to be improved and the speed fluctuations due to load variations to be minimized. • LB8500M : For use as a driver IC that increases the motor speed as the command voltage falls (single phase systems) Features • ...
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... Low-level input voltage V OL (C) LIM pin Input bias current IB(LIM) Common-mode input voltage VILIM range * The design specification items are design guarantees and are not measured. LB8500M Conditions V CC pin V CC pin, with V CC shorted to 6VREG E0 pin Conditions min 17V ...
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... Minimum speed setting. Normally, the 6V regulator level is resistor divided to set this pin's input level. 8 GND Ground pin 9 EI One-shot multivibrator output and integrating amplifier input. A capacitor must be connected between this pin and EO for this integration Integrating amplifier output. LB8500M GND FGIN LIM LB8500M CTL Description Top view No.8336-3/15 ...
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... Block Diagrams and Application Examples V CC 12V VREG C4 6VREG LIM CTL CTL CTL signal LB8500M When the FG signal is output to another circuit board LB8500M FGIN EDGE One-shot multivibrator VREF 180kΩ GND Driver IC 6VREG FG FGIN EI C2 VTH EO No.8336-4/15 ...
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... Low on duty CTL pin 6VREG EO pin 0V Startup Timing (soft start pin CTL pin EO pin LB8500M The slope is determined by the external constant connected to the RC pin. For a smaller RC time constant Determined by the LIM pin voltage →High CTL pin (PWM DUTY) →Low EO pin voltage (V) ...
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... CTL signal As shown in the figure below, the LB8500M generates a pulse signal from edges on the FG signal and then generates a pulse width waveform determined by the RC time constant in a one-shot multivibrator. The LB8500M then integrates that pulse waveform to create the output driver IC control voltage (a DC voltage). ...
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... Note that the larger the capacitor, the longer the soft start time will be and its response to changes in the input signal will be slower. CTL pin input inverted waveform (the frequency is the same) CTL pin CTL circuit LB8500M R × 0.94 × 63kΩ 1.18 × 78kΩ ...
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... LIM pin will have the following values. Between 6VREG and LIM pin : 10kΩ Between LIM pin and GND : 50kΩ (RPM) 12000 10000 8000 6000 4000 Minimum speed 2000 LB8500M 0 0% 20% 24% 40% 60% CTL Duty (PWM duty) LIM pin voltage 6V 5V 80% ...
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... CTL signal In this circuit, the dynamic range of the LB8500M EO pin (the range from the amplifier block output high to output low levels) must be wider than the dynamic range (from the high to low levels of the PWM signal) of VTH pin of driver IC with which this IC is combined. ...
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... Input a fixed-duty signal to the CTL pin signal input as an input signal for which soft start is enabled at startup. Alternatively, apply a constant voltage to the C pin. (In this case, the CTL pin must be left open.) LB8500M 0% 20% 40% 60% CTL signal (PWM duty) C pin voltage 6V VREG LB8500M FGIN EDGE One-shot multivibrator VREF 180kΩ GND 80% 100% Driver IC ...
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... Application Example 4 [Analog Input] DC voltage speed control Motor full speed Set minimum speed V CC 12V 6VREG RC LIM C VCTL voltage CTL LB8500M (RPM) 0 6.0V 5.2V 4.4V 3.6V C pin voltage LB8500M VREG EDGE One-shot multivibrator VREF 180kΩ CTL GND 2.8V 2.0V Driver IC FGIN FG FGIN EI EO VTH No.8336-11/15 ...
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... Ambient temperature based speed control using a thermistor V CC 12V VREG 6VREG RC LIM C CTL CTL LB8500M (RPM) Motor C pin voltage change with the thermistor full speed Set minimum speed Ambient temperature, Ta – °C LB8500M EDGE FGIN One-shot multivibrator VREF 180kΩ GND Driver IC FGIN FG EI VTH EO No.8336-12/15 ...
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... Ambient temperature plus external PWM duty based speed control using a thermistor Motor full speed Set minimum speed V CC 12V VREG 6VREG RC LIM C CTL CTL LB8500M (RPM) Ambient temperature, Ta – °C LB8500M EDGE FGIN One-shot multivibrator VREF 180kΩ GND Driver IC FGIN VTH No.8336-13/15 ...
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... Changing the origin from 0rpm state where there is rotation 12V 6VREG RC LIM - C + CTL CTL signal LB8500M (RPM) 0% 20% 40% 60% CTL signal (PWM duty) LB8500M VREG EDGE One-shot multivibrator VREF 180kΩ CTL GND 80% 100% Driver IC FGIN FG FGIN EI EO VTH No.8336-14/15 ...
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... SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. LB8500M PS No.8336-15/15 ...