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FAN7529

Critical Conduction Mode PFC Controller

FAN7529 Critical Conduction Mode PFC Controller

April 2007

Features

 Low Total Harmonic Distortion (THD)  Precise Adjustable Output Over-Voltage Protection  Open-Feedback Protection and Disable Function  Zero Current Detector  150µs Internal Start-up Timer  MOSFET Over-Current Protection  Under-Voltage Lockout with 3.5V Hysteresis  Low Start-up (40µA) and Operating Current (1.5mA)  Totem Pole Output with High State Clamp  +500/-800mA Peak Gate Drive Current  8-Pin DIP or 8-Pin SOP

Applications

 Adapter  Ballast  LCD TV, CRT TV  SMPS

Related Application Notes

 AN-6026 - Design of Power Factor Correction Circuit

Using FAN7529

Description

The FAN7529 is an active power factor correction (PFC) controller for boost PFC applications that operates in critical conduction mode (CRM). It uses the voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate MO SFET turn-off signal. Because the voltage-mode CRM PFC controller does not need rectified AC line voltage inform ation, it saves the power loss of the input voltage sensing netwo rk necessary for the current-mode CRM PFC controller.

FAN7529 provides many protection functions, such as over-voltage protection, open-feedback protection, overcurrent protection, and under-voltage lockout protection. The FAN7529 can be disabled if the INV pin voltage is lower than 0.45V and the operating current decreases to 65µA. Using a new variable on-time control method, THD is lower than the conventional CRM boost PFC ICs.

Ordering Information

Operating T emp.

Part Number

FAN7529N -40°C to +125°C Yes 8-DIP Rail FAN7529 FAN7529M -40°C to +125°C Yes 8-SOP Rail FAN7529

FAN7529MX -40°C to +125°C Yes 8-SOP Tape & Reel FAN7529

Range Pb-Free Package Packing Method

Marking

Code

Typical Application Diagrams

AC

IN

Figure 1. Typical Boost PFC Application

FAN7529 Critical Conduction Mode PFC Controller

LD

N

V

AUX

R2

V

CC

AUX

R

ZCD

FAN7529

INV

MOT

CS

COMP

R1

GND

V

O

C

O

FAN7529 Rev. 00

Internal Block Diagram

8

V

CC

8.5V

12V

5

ZCD

CS

MOT

4

3

2.9V

6.7V

40k

8pF

Ramp Signal

Saw Tooth

Generator

1.4V

0.8V

1.5V

Current Protection

Comparator

1V Offset

UVLO

Disable

Zero Current

Detector

2.5V Ref

Internal

Bias

Timer

S

R

Q

Error

Amplifier

1V~5V Range

V

ref1

Disable

Gm

OVP

V

ref1

V

CC

Drive

Output

2.675V

2.5V

0.45V 0.35V

7

OUT

1

INV

6

GND

2

COMP

FAN7529 Rev. 00

Figure 2. Functional Block Diagram of FAN7529

Pin Assignments

FAN7529 Critical Conduction Mode PFC Controller

V

CC

OUT GND ZCD

6 58 7

YWW

FAN7529

1 2 3 4

COMP CSMOTINV

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1INV

2COMP

3MOT

4CS

5ZCD

6GND

7OUT

8V

CC

This pin is the inverting input of the error amplifier. The output voltage of the boost PFC converter should be resistively divided to 2.5V.

This pin is the output of the transconductance error amplifier. Components for output voltage compensation should be connected between this pin and GND.

This pin is used to set the slope of the internal ramp. The voltage of this pin is maintained at 2.9V . If a resistor is connected between this pin and GND, current flows out of the pin and the slope of the internal ramp is proportional to this current.

This pin is the input of the over-current protection comparator. The MOSFET current is sensed using a sensing resistor and the resulting voltage is appl ied to this pin. An internal RC filter is included to filter switching noise.

This pin is the input of the zero current detection block. If the voltage of this pin goes higher than 1.5V, then goes lower than 1.4V, the MOSFET is turned on.

This pin is used for the ground potential of all the pins. For proper operation, the signal ground and the power ground should be separated.

This pin is the gate drive output. The peak sourcing and sinking current levels are +500mA and -800mA respectively. For proper operation, the stray inductance in the gate driving path must be minimized.

This pin is the IC supply pin. IC current and MOSFET drive current are supplied using this pin.

FAN7529 Rev. 00

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating cond itions may affect device reliability. The absolute maximum ratings are stress ratings only. T

Symbol Parameter Value Unit

V

CC

, I

I

OH

I

clamp

I

det

V

IN

T

J

T

A

T

STG

V

ESD_HBM

V

ESD_MM

V

ESD_CDM

OL

Supply Voltage V Peak Drive Output Current +500/-800 mA Driver Output Clamping Diodes VO>VCC or VO<-0.3V ±10 mA Detector Clamping Diodes ±10 mA Error Amplifier, MOT, CS Input Voltages -0.3 to 6 V Operating Junction Temperature 150 °C Operating Temperature Range -40 to 125 °C Storage Temperature Range -65 to 150 °C ESD Capability, Human Body Model 2.0 kV ESD Capability, Machine Model 300 V ESD Capability, Charged Device Model 500 V

= 25°C unless otherwise specified.

A

Z

V

FAN7529 Critical Conduction Mode PFC Controller

Thermal Impedance

(1)

Symbol Parameter Value Unit

θ

JΑ

Thermal Resistance, Junction-to-Ambient

Note:

1. Regarding the test environment and PCB type, please refer to JESD51-2 and JESD51-10.

8-DIP 110 °C/W

8-SOP 150 °C/W

FAN7529 Critical Conduction Mode PFC Controller

Electrical Characteristics

VCC = 14V and TA = -40°C~125°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

UNDER-VOLTAGE LOCKOUT SECTION

V

th(start)

V

th(stop)

HY

(uvlo)

V

SUPPLY CURRENT SECTION

I

CC

I

dcc

I

CC(dis)

ERROR AMPLIFIER SECTION

V

ref1

ΔV ΔV

I

b(ea)

I

source

I

sink

V

eao(H)

V

eao(Z)

g

MAXIMUM ON-TIME SECTION

V

mot

T

on(max)

CURRENT SENSE SECTION

V

CS(limit)

I

b(cs)

t

d(cs)

Start Threshold Voltage VCC increasing 1 1 12 13 V Stop Threshold V oltage VCC decreasing 7.5 8.5 9.5 V UVLO Hysteresis 3.0 3.5 4.0 V Zener Voltage ICC = 20mA 20 22 24 V

Z

Start-up Supply Current VCC = V

st

- 0.2V 40 70 µA

th(start)

Operating Supply Current Output no switching 1.5 3.0 mA Dynamic Operating Supply Current 50kHz, Cl=1nF 2.5 4.0 mA Operating Current at Disable V

= 0V 20 65 95 µA

inv

Voltage Feedback Input Threshold1 TA = 25°C 2.465 2.500 2.535 V Line Regulation VCC = 14V ~ 20V 0.1 10.0 mV

ref1

Temperature Stability of V

ref2

Input Bias Current V Output Source Current V Output Sink Current V Output Upper Clamp Voltage V

ref1

(2)

20 mV

= 1V ~ 4V -0.5 0.5 µA

inv

= V

inv inv inv

- 0.1V -12 µA

ref1

= V

+ 0.1V 12 µA

ref1

= V

- 0.1V 5.4 6.0 6.6 V

ref1

Zero Duty Cycle Output Voltage 0.9 1.0 1.1 V Transconductance

m

Maximum On-Time Voltage R Maximum On-Time Programming R

Current Sense Input Threshold Voltage Limit

(2)

90 115 140 µmho

= 40.5kΩ 2.784 2.900 3.016 V

mot

= 40.5kΩ, TA = 25°C192429µs

mot

0.7 0.8 0.9 V Input Bias Current VCS = 0V ~ 1V -1.0 -0.1 1.0 µA Current Sense Delay to Output

(2)

dV/dt = 1V/100ns, from 0V to 5V

350 500 ns

Note:

2. These parameters, although guaranteed by design, are not tested in production.

FAN7529 Critical Conduction Mode PFC Controller

Electrical Characteristics (Continued)

VCC = 14V and TA = -40°C~125°C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

ZERO CURRENT DETECT SECTION

(3)

1.35 1.50 1.65 V

0.05 0.10 0.15 V

= 3mA 6.0 6.7 7.4 V

det

= -3mA 0 0.65 1.00 V

det

= 1V ~ 5V -1.0 -0.1 1.0 µA

ZCD

TA = 25°C-10mA TA = 25°C10mA dV/dt = -1V/100ns,

from 5V to 0V

100 200 ns

Cl = 1nF 50 100 ns Cl = 1nF 50 100 ns

V

th(ZCD)

HY

(ZCD)

V

clamp(H)

V

clamp(L)

I

b(ZCD)

I

source(zcd)

I

sink(zcd)

t

dead

Input Voltage Threshold Detect Hysteresis Input High Clamp Voltage I Input Low Clamp Voltage I Input Bias Current V Source Current Capability Sink Current Capability Maximum Delay from ZCD to Output

Turn-on

(3)

OUTPUT SECTION

V

OH

V

OL

t

V

O(max)

V

O(UVLO)

r f

Output Voltage High IO = -100mA, TA = 25°C 9.2 11.0 12.8 V Output Voltage Low IO = 200mA, TA = 25°C1.02.5V Rising Time Falling Time

(3)

Maximum Output Voltage VCC = 20V, IO = 100μA 11.5 13.0 14.5 V Output Voltage with UVLO Activated VCC = 5V, IO = 100μA1V

RESTART TIMER SECTION

t

d(rst)

Restart Timer Delay 50 150 300 µs

OVER-VOLTAGE PROTECTION SECTION

OVP Threshold Voltage TA = 25°C 2.620 2.675 2.730 V OVP Hysteresis TA = 25°C 0.120 0.175 0.230 V

HY

V

ovp

(ovp)

ENABLE SECTION

V HY

th(en)

(en)

Enable Threshold Voltage 0.40 0.45 0.50 V Enable Hysteresis 0.05 0.10 0.15 V

Note:

3. These parameters, although guaranteed by design, are not tested in production.