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ML4428IS Folha de dados(PDF) 9 Page - Micro Linear Corporation |
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ML4428IS Folha de dados(HTML) 9 Page - Micro Linear Corporation |
9 / 16 page 9 ML4428 Figure 4 shows the linearized transfer function of the Phase Locked Loop with the phase detector formed from the sampled phase through the Gm amplifier with the loop filtered formed by R, C1, and C2. The Phase detector gain is: Ke Atten A Radian ×× ×× − ω π 2 23 10 4 ./ Where Ke is the motor back-E.M.F. constant in V/Radian/ sec, w is the rotor speed in r/s, and Atten is the back- E.M.F. resistive attenuator, nominally 0.3. The simplified impedance of the loop filter is Zs Cs s s RC LEAD LAG () () () = + + 1 1 ω ω Where the lead and lag frequencies are set by: ωLEAD RC = 1 2 ωLAG CC RC C = + 12 12 Requiring the loop to settle in 20 PLL cycles with wLAG = 10 ¥ wLEAD produces the following calculations for R, C1 and C2: C Atten K N e 1 4 7 508 10 = ×× × − . C2 = 9 ¥ C1 R Atten K RPM e MAX = × ×× 889 10 4 . where Ke is the back-EMF constant in volts per radian per second, and RPMMAX is the rotor speed. See Micro Linear application note 35 for derivation of the above formulas. The 80k resistor to GND from the RCVCO pin assists in a smooth transition from sense mode to closed loop operation. Figure 5. Typical Sensed Start-up t IMOTOR DRIVE SENSE DRIVE SENSE DRIVE DRIVE SENSE LOOP CLOSED HERE (RUN MODE) t IMOTOR ~200 µs DRIVE ~100ms SENSE ~3ms Figure 3. VCO Output Frequency vs. VVCO (Pin 20) 02 468 10 12 3000 2500 2000 1500 1000 500 0 VVCO (VOLTS) CVCO = 164nF CVCO = 82nF |
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