FAN4822IM Datasheet FAN4822IM, FAN4822IN, FAN4822IMX | P1-P3

www.fairchildsemi.com

REV. 1.0.1 8/10/01

Features

• Average current sensing, continuous boost, leading edge

PFC for low total harmonic distortion and near unity

power factor

• Built-in ZVS switch control with fast response for high

efﬁciency at high power levels

• Average line voltage compensation with brownout control

• Current fed gain modulator improves noise immunity and

provides universal input operation

• Overvoltage comparator eliminates output “runaway” due

to load removal

• UVLO, current limit, and soft-start

• Precision 1.3% reference

General Description

The FAN4822 is a PFC controller designed speciﬁcally for

high power applications. The controller contains all of the

functions necessary to implement an average current boost

PFC converter, along with a Zero Voltage Switch (ZVS) con-

troller to reduce diode recovery and MOSFET turn-on

losses.

The average current boost PFC circuit provides high power

factor (>98%) and low Total Harmonic Distortion (THD).

Built-in safety features include undervoltage lockout, over-

voltage protection, peak current limiting, and input voltage

brownout protection.

The ZVS control section drives an external ZVS MOSFET

which, combined with a diode and inductor, soft switches the

boost regulator. This technique reduces diode reverse recov-

ery and MOSFET switching losses to reduce EMI and maxi-

mize efﬁciency.

Block Diagram

QS

R

–

+

1

14

VEAO

VEA

2.5V

FB

4

I

AC

5

V

RMS

+

–

3

I

SENSE

8

GND

2

IEAO

+

–

IEA

R+

R–

+

–

––

6

R

T

C

T

OSC

GAIN

MODULATOR

S

R

Q

+

–

2.7V

FB

–1V

12

V

CC

V

CCZ

13.5V

ZVS OUT

11

Q

S

R

Q

PFC OUT

9

PWR GND

10

OVP

I LIMIT

REF

13

ZV SENSE

7

+

V

CCZ

REF

Q

FAN4822

ZVS Average Current PFC Controller

FAN4822 PRODUCT SPECIFICATION

2

REV. 1.0.1 8/10/01

Pin Conﬁguration

Pin Description

(Pin numbers is parentheses are for 16-pin package)

Pin Name Function

1 (1) VEAO Transconductance voltage error amplifier output.

2 (2) IEAO Transconductance current error amplifier output.

3 (3) I

SENSE

Current sense input to the PFC current limit comparator.

4 (4) I

AC

PFC gain modulator reference input.

5 (5) V

RMS

Input for RMS line voltage compensation.

6 (6) R

T

C

T

Connection for oscillator frequency setting components.

7 (7) ZV SENSE Input to the high speed zero voltage crossing comparator.

8 (10) GND Analog signal ground.

9 (11) PWR GND Return for the PFC and ZVS driver outputs.

10 (12) ZVS OUT ZVS MOSFET driver output.

11 (13) PFC OUT PFC MOSFET driver output.

12 (14) V

CC

Shunt-regulated supply voltage.

13 (15) REF Buffered output for the internal 7.5V reference.

14 (16) FB Transconductance voltage error amplifier input.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VEAO

IEAO

I

SENSE

I

AC

V

RMS

R

T

C

T

ZV SENSE

N/C

FAN4822

16-Pin SOIC (S16W)

FAN4822

14-Pin DIP (P14)

FB

REF

V

CC

PFC OUT

ZVS OUT

PWR GND

GND

N/C

TOP VIEW

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VEAO

IEAO

I

SENSE

I

AC

V

RMS

R

T

C

T

ZV SENSE

FB

REF

V

CC

PFC OUT

ZVS OUT

PWR GND

GND

TOP VIEW

Absolute Maximum Ratings

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum rat-

ings are stress ratings only and functional device operation is not implied.

Parameter Min Max Unit

Shunt Regulator Current (I

CC

)55mA

Peak Driver Output Current ±500 mA

Analog Inputs –0.3 7 V

Junction Temperature 150 °C

Storage Temperature Range –65 150 °C

Lead Temperature (Soldering, 10 sec) 150 °C

Thermal Resistance (

θ

JA

)

Plastic DIP

Plastic SOIC

80

110

°C/W

PRODUCT SPECIFICATION FAN4822

REV. 1.0.1 8/10/01

3

Operating Conditions

Electrical Characteristics

Unless otherwise speciﬁed, R

T

= 52.3k

Ω

, C

T

= 470pF, T

A

= Operating Temperature Range (Note 1)

Temperature Range Min. Max. Units

FAN4822IX –40 85 °C

Parameter Conditions Min. Typ. Max. Units

Voltage Error Amplifier

Input Voltage Range 0 7 V

Transconductance V

NON-INV

= V

INV

, VEAO = 3.75V 50 70 120

µ

Feedback Reference Voltage V

EAO

= V

FB

2.4 2.5 2.6 V

Open Loop Gain 60 75 dB

PSRR V

CCZ

– 3V < V

CC

< V

CCZ

– 0.5V 60 75 dB

Output Low 0.65 1 V

Output High 6.0 6.7 V

Source Current

∆

V

IN

= ±0.5V, V

OUT

= 6V –40 –80 µA

Sink Current

∆

V

IN

= ±0.5V, V

OUT

= 1.5V 40 80 mA

Current Error Amplifier

Input Voltage Range –1.5 2 V

Transconductance V

NON-INV

= V

INV

, IEAO = 3.75V 130 195 310

µ

Input Offset Voltage ±3 ±15 mV

Open Loop Gain 60 75 dB

PSRR V

CCZ

– 3V < V

CC

< V

CCZ

– 0.5V 60 75 dB

Output Low 0.65 1 V

Output High 6.0 6.7 V

Source Current

∆

V

IN

= ±0.5V, V

OUT

= 6V –30 –80

µ

A

Sink Current

∆

V

IN

= ±0.5V, V

OUT

= 1.5V 40 80

µ

A

OVP Comparator

Threshold Voltage 2.6 2.7 2.8 V

Hysteresis 80 120 150 mV

I

SENSE

Comparator

Threshold Voltage –0.8 –1.0 –1.15 V

Delay to Output 150 300 ns

ZV Sense Comparator

Propagation Delay 100mV Overdrive 50 ns

Threshold Voltage 7.35 7.5 7.65 V

Input Capacitance 6 pF

Ω

FAN4822IM

FAN4822IM

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