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PFS714EG Datasheet(PDF) 10 Page - Power Integrations, Inc. |
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PFS714EG Datasheet(HTML) 10 Page - Power Integrations, Inc. |
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10 / 30 page  Rev. D 12/11 10 PFS704-729EG www.powerint.com Application Example A High Efficiency, 347 W, 380 VDC Universal Input PFC The circuit shown in Figure 11 is designed using a PFS714EG device from the HiperPFS family of integrated PFC controllers. This design is rated for a continuous output power of 347 W and provides a regulated output voltage of 380 VDC nominal maintaining a high input power factor and overall efficiency from light load to full load. Fuse F1 provides protection to the circuit and isolates it from the AC supply in case of a fault. Diode bridge BR1 rectifies the AC input. Capacitors C3, C4, C5, C6 and C19 together with inductors L1, L2, L3 and L4 form the EMI filter reducing the common mode and differential mode noise. Resistors R1, R3 and CAPZero, IC U2 are required to discharge the EMI filter capacitors once the circuit is disconnected. CAPZero eliminates static losses in R1 and R2 by only connecting these components across the input when AC is removed. The boost converter stage consists of inductor L5, diode rectifier D2 and the HiperPFS IC U1. This converter stage works as a boost converter and controls the input current of the power supply while simultaneously regulating the output DC voltage. Diode D1 prevents a resonant build up of output voltage at start- up by bypassing inductor L5 while simultaneously charging output capacitor C15. Thermistor RT1 limits the inrush input current of the circuit at start-up and prevents saturation of L5. In most high-performance designs, a relay will be used to bypass the thermistor after start-up to improve power supply efficiency. Therefore efficiency measurement, that represents the high performance configuration, the thermistors should be shorted. Capacitors C14 and C21 are used for reducing the loop length and area of the output circuit to reduce EMI and overshoot of voltage across the drain and source of the MOSFET inside U1 at each switching instant. The PFS714EG IC requires a regulated supply of 12 V for operation and must not exceed 13.4 V. Resistors R6, R16, R17, Zener diode VR1, and transistor Q3 form a shunt regulator that prevents the supply voltage to IC U1 from exceeding 12 V. Capacitors C8, C18 and C20 filter the supply voltage and provide decoupling to ensure reliable operation of IC U1. Diode D5 prevents destruction of U1 if the auxiliary input is inadvertently connected reverse polarity. The rectified AC input voltage of the power supply is sensed by IC U1 using resistors R4, R5 and R19. The capacitor C12 filters any noise on this signal. Divider network comprising of resistors R9, R10, R11, R12, R13, and R14 are used to scale the output voltage and provide feedback to IC U1. The circuit comprising of diode D4, transistor Q1, Q2 and the resistors R12 and R13 form a non- linear feedback circuit which improves the load transient response by improving the response time of the PFC circuit. Resistor R7, R8, R15, and capacitors C13 and C17 are required for shaping the loop response of the feedback network. The combination of resistor R8 and capacitor C13 provide a low frequency zero and the resistor R15 and capacitor C13 form a low frequency pole. PI-6197-111110 N E L R1 220 k Ω RT1 10 Ω R6 100 Ω C8 47 µF 50 V D5 DL4001 Q3 MMBT4401LT1G R16 100 Ω R17 3.01 k Ω 1% R2 220 k Ω R18 10 Ω 2 W L4 Ferrite Bead R4 1.5 M Ω 1% R19 1.5 M Ω 1% R5 1 M Ω 1% L5 1.38 mH BR1 GBU806 600 V D1 1N5408 D4 1N4148 D3 BAV116 130 V D2 STTH8S06D L1 14 mH C6 100 nF 275 VAC C19 1 µF 310 V C5 680 pF 250 VAC C7 1 µF 400 V R13 2.21 k Ω 1% R7 2 k Ω R12 2.21 k Ω 1% R10 1.6 M Ω 1% R11 732 k Ω 1% R9 1.5 M Ω 1% R15 160 k Ω C17 470 pF 100 V C21 10 nF 1 kV C14 10 nF 1 kV C4 680 pF 250 VAC C3 680 nF 275 VAC F1 6.3 A RV1 320 VAC D S FB VCC V G DC OUT 380 VDC Auxiliary Power Supply CONTROL HiperPFS U1 PFS714EG C11 10 nF 50 V C12 100 nF 50 V C18 1 µF 25 V C13 4.7 µF 25 V C20 100 nF 50 V Q1 MMBT4401 tO D1 CAPZero U2 CAP006DG D2 L2 100 µH C16 100 nF 200 V R14 57.6 k Ω 1% L3 100 µH C15 270 µF 450 V *Optional Component R8 3.01 k Ω 1% + + Figure 11. 347 W PFC using PFS714EG. |
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