PFS7323L datasheet(12/30 Pages) POWERINT

12 / 30 page

Rev. B 06/13

PFS7323-7329

www.powerint.com

Application Example

A High Efficiency, 350 W, 385 VDC Universal Input PFC

The circuit shown in Figure 14 is designed using a PFS7328H

device from the HiperPFS-2 family of integrated PFC controllers.

This design is rated for a continuous output power of 350 W

and provides a regulated output voltage of 385 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 C1, C2, C3, and C4 together with inductors

L1, L2, and L3 form the EMI filter reducing the common mode

and differential mode noise. Resistors R1, R2 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, and the

HiperPFS-2 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

D3 prevents a resonant build up of output voltage at start-up by

bypassing inductor L5 while simultaneously charging output

capacitor C13. 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.

Capacitor C10 is 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 PFS7328H IC requires a regulated supply of 12 V for

operation and must not exceed 15 V. Resistors R10, R11, R12,

Zener diode VR1, and transistor Q2 form a series pass regulator

that prevents the supply voltage to IC U1 from exceeding 12 V.

Capacitors C6, and C9 filter the supply voltage and provide

decoupling to ensure reliable operation of IC U1. Diode D5

provides reverse polarity protection.

Resistor R15 programs the output voltage level [via the POWER

GOOD THRESHOLD (PGT) pin] below which the POWER

GOOD [PG] pin will go into a high-impedance state. IC U1 is

configured in full power mode by resistor R14. Capacitor C8

decouples REFERENCE pin of IC U1.

The rectified AC input voltage of the power supply is sensed by

IC U1 using resistors R7, R8 and R9. The capacitor C7 filters

any noise on this signal.

Divider network comprising of resistors R18, R19, R20, and

R21 are used to scale the output voltage and provide feedback

to IC U1. Capacitor C14 enables rapid correction of output

voltage overshoot or undershoot resulting from transient loading.

Resistor R17, R16, and capacitors C12 and C11 are required for

shaping the loop response of the feedback network. The

combination of resistor R16 and capacitor C12 provide a low

frequency zero and the resistor R17, R16 and capacitor C12

form a low frequency pole. C15 and R22 attenuate high-

frequency noise.

Diode D6 protects against an accidentally shorted capacitor

C12 by safely shutting down the IC.

Figure 14. 350 W PFC using PFS7328H.

360

µH

OUT

PGT

VCC

CONTROL

HiperPFS-2

PFS7328H

PI-6971-041713

Remote

220 k

Ω

RT1

2.5

Ω

R10

Ω

16 k

Ω

3 k

Ω

S1AB

10 k

Ω

BAV16

µF

50 V

µF

450 V

22 nF

50 V

R14

24.9 k

Ω

R15

100 k

Ω

R16

7.5 k

Ω

R17

487

Ω

470 pF

50 V

S1AB

VR1

1N4743A

13 V

MMBT4403

LTV817A

MMBT4401LT1G

R11

Ω

R12

2.2 k

Ω

220 k

Ω

2 W

Ferrite Bead

BR1

GBU8K-BP

800 V

9 mH

220 nF

275 V

680 pF

250 VAC

680 pF

250 VAC

680 nF

275 VAC

6.3 A

RV1

320 VAC

Auxiliary

Power

Supply

CAPZero

CAP005DG

220

µH

C12

2.2

µF

25 V

C13

270

µF

450 V

C14

47 nF

200 V

R21

60.4 k

Ω

R18

1.5 M

Ω

1.5 M

Ω

1.5 M

Ω

1 M

Ω

R19

787 k

Ω

R20

1.6 M

Ω

C10

10 nF

1 kV

C11

22 nF

25 V

BAV116

1N5408-T

3.3

µF

25 V

R22

3 k

Ω

C15

47 nF

25 V

PFS7323L 数据表(PDF) 12 Page - Power Integrations, Inc.

PFS7323L 数据表(HTML) 12 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

数据表下载

链接网址

PFS7323L 数据表(PDF) 12 Page - Power Integrations, Inc.

PFS7323L 数据表(HTML) 12 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

数据表 下载

链接网址

数据表下载