lb8502m Sanyo Semiconductor Corporation, lb8502m Datasheet
lb8502m
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lb8502m Summary of contents
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... 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. • LB8502M: For use as a driver IC that increases the motor speed as the command voltage rises (three-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. LB8502M 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. LB8502M GND FGIN LIM LB8502M CTL Description Top view No.8337-3/11 ...
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... Block Diagrams and Application Examples 12V V CC VREG C4 6VREG LIM CTL CTL CTL signal LB8502M When the FG signal is output to another circuit board LB8502M FGIN EDGE One-shot multivibrator VREF 180kΩ GND Driver IC 6VREG FGIN VCTL EO No.8337-4/11 ...
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... Low on duty CTL pin 6VREG EO pin 0V Startup Timing (soft start pin CTL pin EO pin LB8502M The slope is determined by the external constant connected to the RC pin. For a larger RC time constant Determined by the LIM pin voltage →High CTL pin (PWM DUTY) → High ...
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... CTL signal As shown in the figure below, the LB8502M 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 LB8502M then integrates that pulse waveform to create the output driver IC control voltage (a DC voltage). ...
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... R is the IC internal resistance of 180kΩ (typical).) 1 < RC 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 CTL circuit LB8502M R × 0.94 × 63kΩ ...
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... LIM pin will have the following values. Between 6VREG and LIM pin : 50kΩ Between LIM pin and GND : 10kΩ (RPM) 12000 10000 8000 6000 4000 Minimum speed 2000 LB8502M 0 0% 20% 24% 40% 60% CTL Duty (PWM duty) LIM pin voltage 0V 1V 80% ...
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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.) LB8502M 0% 20% 40% 60% CTL signal (PWM duty) C pin voltage 0V VREG LB8502M EDGE FGIN One-shot multivibrator VREF 180kΩ GND 80% 100% 4V ...
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... Application Example 3 [Analog Input] DC voltage speed control Motor full speed Set minimum speed V CC 12V 6VREG RC LIM C VCTL signal CTL LB8502M (RPM 0.8V 1.6V 2.4V C pin voltage VREG LB8502M EDGE One-shot multivibrator VREF 180kΩ CTL GND 3.2V 4.0V Driver IC FGIN FG FGIN EI VCTL EO No.8337-10/11 ...
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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. LB8502M PS No.8337-11/11 ...