PFS704 datasheet(10/30 Pages) POWERINT

10 / 30 page

Rev. D 12/11

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

220 k

Ω

RT1

Ω

100

Ω

µF

50 V

DL4001

MMBT4401LT1G

R16

100

Ω

R17

3.01 k

Ω

220 k

Ω

R18

Ω

2 W

Ferrite Bead

1.5 M

Ω

R19

1.5 M

Ω

1 M

Ω

1.38 mH

BR1

GBU806

600 V

1N5408

1N4148

BAV116

130 V

STTH8S06D

14 mH

100 nF

275 VAC

C19

µF

310 V

680 pF

250 VAC

µF

400 V

R13

2.21 k

Ω

2 k

Ω

R12

2.21 k

Ω

R10

1.6 M

Ω

R11

732 k

Ω

1.5 M

Ω

R15

160 k

Ω

C17

470 pF

100 V

C21

10 nF

1 kV

C14

10 nF

1 kV

680 pF

250 VAC

680 nF

275 VAC

6.3 A

RV1

320 VAC

VCC

OUT

380 VDC

Auxiliary

Power

Supply

CONTROL

HiperPFS

PFS714EG

C11

10 nF

50 V

C12

100 nF

50 V

C18

µF

25 V

C13

4.7

µF

25 V

C20

100 nF

50 V

MMBT4401

CAPZero

CAP006DG

100

µH

C16

100 nF

200 V

R14

57.6 k

Ω

100

µH

C15

270

µF

450 V

*Optional Component

3.01 k

Ω

Figure 11. 347 W PFC using PFS714EG.

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