STMicroelectronics 250W TRANSITION-MODE PFC PRE-REGULATOR WITH L6563S EVL6563S-250W EVL6563S-250W 데이터 시트
제품 코드
EVL6563S-250W
Test results and significant waveforms
AN3119
14/32
Doc ID 16849 Rev 2
filtering needs. In fact, a large capacitance introduces a conduction dead-angle of the AC
input current in itself, therefore reducing the effectiveness of the optimizer circuit.
input current in itself, therefore reducing the effectiveness of the optimizer circuit.
In
the detail of the waveforms at switching frequency shows the operation of the
transition mode control; once the inductor has transferred all the energy stored, a falling
edge on the ZCD pin (#11) is detected and it triggers a new on-time by setting the gate drive
high. Once the current signal on the CS pin (#4) has reached the level programmed by the
internal multiplier circuitry, according to the input mains instantaneous voltage and the error
amplifier output level, the gate drive is set low and MOSFET conduction is stopped. During
the following off-time the energy stored in the inductor is transferred into the output capacitor
and to the load. At the end of the current conduction a new demagnetization is detected by
the ZCD which provides for a new on-time of the MOSFET.
edge on the ZCD pin (#11) is detected and it triggers a new on-time by setting the gate drive
high. Once the current signal on the CS pin (#4) has reached the level programmed by the
internal multiplier circuitry, according to the input mains instantaneous voltage and the error
amplifier output level, the gate drive is set low and MOSFET conduction is stopped. During
the following off-time the energy stored in the inductor is transferred into the output capacitor
and to the load. At the end of the current conduction a new demagnetization is detected by
the ZCD which provides for a new on-time of the MOSFET.
In
the waveforms of the MULT, V
FF
, INV, and COMP pins are shown.
Figure 16.
EVL6563S-250W TM PFC: MOSFET
current at 100 Vac - 50 Hz - full load
current at 100 Vac - 50 Hz - full load
Figure 17.
EVL6563S-250W TM PFC: MOSFET
current at 100 Vac - 50 Hz - full load
current at 100 Vac - 50 Hz - full load
CH1: Q1 gate voltage, CH2: Q2 gate voltage,
CH3: Q1 drain current
CH4: Q2 drain current
CH1: Q1 gate voltage, CH2: Q2 gate voltage
CH3: Q1 drain current
CH4: Q2 drain current
Figure 18.
EVL6563S-250W TM PFC: L6563S
control pins-1 at 115 Vac - 60 Hz -
full load
control pins-1 at 115 Vac - 60 Hz -
full load
Figure 19.
EVL6563S-250W TM PFC: L6563S
control pins-2 at 115 Vac - 60 Hz -
full load
control pins-2 at 115 Vac - 60 Hz -
full load
CH1: GD - pin #13, CH2: ZCD - pin #11, CH3: CS - pin #4
CH4: MULT - pin #3
CH1: INV - pin #1, CH2: MULT - pin #3, CH3: COMP - pin #2
CH4: V
FF
- pin #5