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LB11961V 데이터시트(PDF) 5 Page - ON Semiconductor |
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LB11961V 데이터시트(HTML) 5 Page - ON Semiconductor |
5 / 7 page LB11961V No.8794-5/7 Application Circuit Example *1.Power supply and ground lines P-GND is connected to the motor power supply system and S-GND is connected to the control circuit power supply system. These two systems should be formed from separate lines and the control system external components should be connected to S-GND. *2. Regeneration power supply stabilization capacitor The capacitor CM provides power supply stabilization for both PWM drive and kickback absorption. A capacitor with a value of over 0.1µF is used for CM. A large capacitor must be used when the coil inductance is large or when the coil resistance is low. Since this IC adopts a technique in which switching is performed by the high side transistor and regeneration is handled by the low side transistor, the pattern connecting CM to VM and P-GND must be as wide and as short as possible. *3.Hall sensor input Lines that are as short as possible must be used to prevent noise from entering the system. The Hall sensor input circuit consists of a comparator with hysteresis (20mV). We recommend that the Hall sensor input level be at least three times this hysteresis, i.e. at least 60mVp-p. *4.PWM oscillator frequency setting capacitor If a value of 100pF is used for CP, the oscillator frequency will be f = 25kHz, and this will be the basic frequency of the PWM signal. *5.RD output This is an open collector output. It outputs a low level when the motor is turning and a high level when it is stopped. This pin must be left open if unused. *6.FG output This is an open collector output, and a rotation count detection function can be implemented using this FG output, which corresponds to the phase switching. This pin must be left open if unused. *7.HB pin This pin provides a Hall effect sensor bias constant-voltage output of 1.25V. *8.RMI pin Connect this pin to VTH if unused. Even if unused, the IC is set internally to operate at a 10% drive duty at the voltage corresponding to the lowest speed. (The capacitor is used to set up full-speed mode at startup.) P-GND VCC FG OUT1 OUT2 CT VTH IN + IN − CPWM *3 CM *1 *6 H *2 *5 RMI RD HB *8 S-GND *4 *7 6VREG CT = 0.47 μF to 1μF CP = 100pF |
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