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AN4213 데이터시트(PDF) 18 Page - STMicroelectronics |
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AN4213 데이터시트(HTML) 18 Page - STMicroelectronics |
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18 / 42 page ![]() Designing a TM PFC AN4213 18/42 DocID023984 Rev 2 Pin 3 (MULT): main input to the multiplier. Figure 8. Multiplier setting This pin is connected to the rectified mains voltage via a resistor divider and provides the sinusoidal reference to the current loop. The multiplier can be described by the relationship: Equation 31 Where: • V CS (multiplier output) is the reference for the current sense • K = 0.38 (typ) is the multiplier gain • V COMP is the voltage on pin 2 • V MULT is the voltage on pin 3 First, the maximum peak value for V MULT max is selected. This value has to be selected in the range from 0 up to 3 V. Typically, it should be less than 3 V in case of single mains Equation 32 where 1.1 V is the multiplier maximum slope which is given in the datasheet. AM17322v1 Vin(Vac) RMULTH RMULTL INV 1 COMP 2 3 MULT 4 CS ZCD GND GD VCC 5 6 7 8 L6562A () MULT COMP CS V V V K V ∗ − = 5 . 2 V V V R I V AC AC S Lpk MULTpk 21 . 1 185 265 1 . 1 47 . 0 99 . 1 1 . 1 min max max = ∗ ∗ = ∗ ∗ = |
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