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ML4428CP Arkusz danych(PDF) 8 Page - Micro Linear Corporation |
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ML4428CP Arkusz danych(HTML) 8 Page - Micro Linear Corporation |
8 / 16 page 8 ML4428 CVCO As given in the section on the VCO and phase detector: C N RPM VCO MAX = × × − 2931 10 6 Where N is the number of poles in the motor, and RPM is the motor’s maximum operating speed in revolutions per minute. CPWM This capacitor sets the PWM ramp oscillator frequency. This is the PWM “switching frequency”. If this value is too low, <20kHz, then magnetostriction effects in the motor may cause audible noise. If this frequency is too high, >30kHz, then the switching losses in the output drivers may become a problem. 25kHz should be a good compromise for this value, which can be obtained by using a 1nF capacitor. RVCO AND RREF RVCO should be 10k and RREF should be 120k for normal operation. VCO FILTER See the section on the VCO and Phase detector for information on these components. VCO AND PHASE DETECTOR CALCULATIONS The VCO should be set so that at the maximum frequency of operation (the running speed of the motor) the VCO control voltage will be no higher than VREF, or 6V. The VCO maximum frequency will be: F N RPM MAX MAX =× × 005 . where N is the number of poles on the motor and RPMMAX is the maximum motor speed in Revolutions Per Minute. The minimum VCO gain derived from the specification table (using the minimum FVCO at VVCO = 6V) is: K C VCO MIN VCO () . = × − 2 665 10 5 Assuming that the VVCO(MAX) = 5.5V, then C F VCO MAX = ×× − 5 5 2 665 10 5 .. or C N RPM VCO MAX = × × − 2931 10 6 Figure 4. Back-EMF Phase Locked Loop Components. R C1 C2 VCO – + ZRC RCVCO FOUT KVCO(Hz/sec/V) Gm = 0.23m SAMPLED PHASE BEMF SAMPLER ROTOR PHASE A/RADIAN gm = 0.23mA/V Ke × ω × Atten 2 × π PHASE DETECTOR (R × C2 × s + 1) s × (C2 + R × C1 × s × C2 + C1) LOOP FILTER 2.665 × 10–5 CVCO × s × 2 × π VCO RADIAN/sec/V V/A |
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