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FAN6920MR

Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller

Fairchild Semiconductor 

Electrical Characteristics (Continued)

VDD=15V, TA=-40°C ~105°C (TA=TJ), unless otherwise specified.

Symbol

Parameter

Conditions

PWM STAGE

Feedback Input Section

AV

Input-Voltage to Current Sense

Attenuation(4)

ZFB

Input Impedance(4)

IOZ

Bias Current

VOZ

VFB-OLP

Zero Duty Cycle Input Voltage

Open-Loop Protection Threshold

Voltage

tFB-OLP

tFB-SS

The Debounce Time for Open-

Loop Protection

Internal Soft-Start Time(4)

DET Pin OVP and Valley Detection Section

VDET-OVP

Av

BW

Comparator Reference Voltage

Open-Loop Gain(4)

Gain Bandwidth(4)

tDET-OVP

Output OVP (Auto-Recovery)

Debounce Time

IDET-SOURCE Maximum Source Current

VDET-LOW Lower Clamp Voltage

tVALLEY-DELAY

Delay Time from Valley Signal

Detected to Output Turn-On(4)

tOFF-BNK

tTIME-OUT

Leading-Edge Blanking Time for

DET-OVP (2.5V) and Valley

Signal when PWM MOS Turns

Off(4)

Time-Out After tOFF-MIN(4)

PWM Oscillator Section

tON-MAX-PWM Maximum On-Time

tOFF-MIN Minimum Off-Time

VN

Beginning of Green-On Mode at

FB Voltage Level

VG

Beginning of Green-Off Mode at

FB Voltage Level

Hysteresis for Beginning of

ΔVG

Green-Off Mode at FB Voltage

Level(4)

AV = VCS /VFB ,

0 < VCS < 0.9

VFB > VG

VFB = VOZ

VFB = 0V~3.6V

VDET = 0V

IDET = 1mA

VFB ≧ VN, TA = 25°C

VFB = VG

Min. Typ. Max. Units

1/2.75 1/3.00 1/3.25

V/V

3

5

7

kΩ

1.2

2.0

mA

0.7

0.9

1.1

V

3.9

4.2

4.5

V

40

50

60

ms

4

5

6

ms

2.45

2.50

2.55

V

60

dB

1

MHz

100

150

200

µs

1

mA

0.15

0.25

0.35

V

150

200

250

ns

2.5

µs

8

9

10

µs

38

45

52

µs

5

µs

20.5

1.95

2.10

2.25

V

1.00

1.15

1.30

V

0.1

V

Continued on the following page…

© 2010 Fairchild Semiconductor Corporation

FAN6920MR • Rev. 1.0.3

10

www.fairchildsemi.com

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