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BA6486FS 데이터시트(PDF) 5 Page - Rohm |
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BA6486FS 데이터시트(HTML) 5 Page - Rohm |
5 / 11 page 548 Motor driver ICs BA6486FS For noise filtering, a high-pass filter is given by C3 and a resistor of 1.6k Ω (typical), and a low-pass filter is given by C4 and a resistor of 200k Ω (typical). The cutoff fre- quencies of high-pass and low-pass filters (fH and fL, re- spectively) are given by: The C3 and C4 capacitances should be set so as to satis- fy the following relationship: fH tfFGtfL where fFG is the FG frequency. Note that the FG amplifier inputs have a hysteresis. The speed discriminator divides the reference clock and compares with the reference frequency, and then outputs an error pulse according to the frequency difference. The motor rotational speed N is given in the following formula. fosc is the reference clock frequency, n is (speed discriminator count) 2, z is the FG tooth number. The discriminator count depends on the speed control pin voltage. The integrator flattens out the error pulse of the speed discriminator and creates a control signal for the motor drive circuit (Fig. 15). (3) Index amplifier The index amplifier is a hysteresis amplifier with a typical hysteresis width of +18mV and –22mV. The input pin is not biased internally. (4) Other circuits S Start/stop circuit The start / stop circuit puts the IC to the operating state when the control pin is LOW, and to the standby state (cir- cuit current is nearly zero) when the control pin is HIGH. The Hall device bias switch, which is linked to the start / stop circuit, is turned off during the standby state, so that the Hall device current is shut down. S Thermal shutdown circuit This circuit shuts down the IC currents when the chip junction temperature is increased to about 175 _C (typi- cal). The thermal shutdown circuit is deactivated when the temperature drops to about 155 _C (typical). fH= 1 2 π 1.6k Ω C3 fL= 1 2 π 200k Ω C4 (1) N=60 S fosc n S 1 z |
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