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AN2782 Datasheet(PDF) 31 Page - STMicroelectronics |
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AN2782 Datasheet(HTML) 31 Page - STMicroelectronics |
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31 / 39 page  AN2782 EVL6562A-400W demonstration board Doc ID 14763 Rev 2 31/39 Figure 23. Wide-range 400 W demonstration board electrical circuit (EVL6562A- 400W) The power stage of the PFC is a conventional boost converter, connected to the output of the rectifier bridge D2. It includes the coil T, the diode D3 and the capacitors C6 and C7. The boost switch is represented by the power MOSFETs Q1 and Q2. The NTC R2 limits the inrush current at switch-on. It has been connected on the DC rail, in series to the output electrolytic capacitor, in order to improve the efficiency during low-line operation. Additionally, the splitting in two of output capacitors (C6 and C7) provides for managing the AC current mainly by the film capacitor C6 so that the electrolytic can be cheaper as it has just to bear the DC part. At startup the L6562A is powered by the Vcc capacitor (C12) that is charged via the resistors R3 and R4, then the T secondary winding (pins 8-11) and the charge pump circuit (R5, C10, D5 and D4) generates the Vcc voltage powering the L6562A during the normal operations. The divider R32, R33 and R34 provides the L6562A multiplier with the information of the instantaneous voltage that is used to modulate the boost current. The divider R9, R10, R11, R12 & 13 is dedicated to sense the output. The line-modulated FOT is obtained by the timing generator components D6, C15, R15, C16, R16, R31, Q3. The board is equipped with an input EMI filter designed for a 2-wire input mains plug. It is composed of two stages, a common mode Pi-filter connected at the input (C1, L1, C2, C3) and a differential mode Pi-filter after the input bridge (C4, L3, C5). It also offers the possibility to easily connect a downstream converter. 5 8 7 6 4 3 2 1 ZCD CS MULT COMP INV L6562A VCC GD GND R102 0R0 +400Vout R19 1K0 C20 330pF L1 CM-1.5mH-5A L3 DM-51uH-6A C15 68pF C16 120pF R22 0R47-1W R15 1k8 C11 470nF/50V C12 100uF/50V R16 30k 1 2 J1 Q2 STP12NM50FP C1 470nF-X2 D6 LL4148 R20 0R47-1W D5 BZX85-C18 R23 0R47-1W R1 1M5 D1 1N5406 1 2 3 4 5 J2 D3 STTH8R06 F1 8A/250V R3 100K C21 10nF R17 6R8 R34 10k R18 6R8 Q3 BC857C R33 620k D7 LL4148 C4 470nF-630V R32 620k D8 LL4148 R2 NTC 2R5-S237 T PQ40-500uH Q1 STP12NM50FP R4 100K R31 3k R21 0R47-1W + - ~ ~ D2 D15XB60 R5 47R C5 470nF-630V R12 47K R13 12k R11 510k R10 510k R35 3R9 R36 3R9 R9 510k C2 470nF R14 47k C3 680nF-X2 C6 470nF-630V C14 2.2uF C13 220nF D4 LL4148 C7 330uF-450V C10 22N +400Vdc 1-2 +400Vdc +400Vdc 5-6 811 RTN NC RTN +400Vdc 90 - 265Vac R101 0R0 |
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