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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6563ATR датащи(PDF) 20 Page - STMicroelectronics |
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L6563ATR датащи(HTML) 20 Page - STMicroelectronics |
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20 / 39 page  Application information L6563 - L6563A 20/39 The twice-mains-frequency (2·fL) ripple appearing across CFF is triangular with a peak-to- peak amplitude that, with good approximation, is given by: Equation 4 where fL is the line frequency. The amount of 3 rd harmonic distortion introduced by this ripple, related to the amplitude of its 2·fL component, will be: Equation 5 Figure 36 shows a diagram that helps choose the time constant RFF·CFF based on the amount of maximum desired 3rd harmonic distortion. Always connect RFF and CFF to the pin, the IC will not work properly if the pin is either left floating or connected directly to ground. Figure 36. RFF·CFF as a function of 3 rd harmonic distortion introduced in the input current The dynamics of the voltage feedforward input is limited downwards at 0.5V (see Figure 35), that is the output of the multiplier will not increase any more if the voltage on the VFF pin is below 0.5V. This helps to prevent excessive power flow when the line voltage is lower than the minimum specified value (brownout conditions). V FF ∆ 2V MULTpk 14f LRFFCFF + --------------------------------------- = D 3% 100 2 πf LRFFCFF --------------------------------- = D % 3 0.1 1 10 0.01 0.1 1 10 f = 50 Hz L f = 60 Hz L R · C [s] FF FF |
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