?2010 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
FAN6921ML " Rev. 1.0.3
8
 
Electrical Characteristics (Continued)
V
DD
=15 V, T
A
=-40~105癈 (T
A
=T
J
), unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.     Units
PFC Stage
Voltage Error Amplifier Section 
Gm
Transconductance
(4)
 
100
125
150
祄ho
V
REF
 
Feedback Comparator Reference Voltage
2.465
2.500
2.535
V
V
INV-H
 
Clamp High Feedback Voltage
RANGE=Open
2.70
2.75
2.80
V
RANGE=Ground
2.60
2.65
2.70
V
V
RATIO
Clamp High Output Voltage Ratio
V
INVH
/ V
REF
,
RANGE=Open
1.06
 
1.14
 
V
INVH
/ V
REF
,
RANGE=Ground
1.04
 
1.08
V
INV-L
 
Clamp Low Feedback Voltage
2.25
2.30
2.35
V
V
INV-OVP
 
Over Voltage Protection for INV
Input
RANGE=Open
 
2.90
2.95
V
RANGE=Ground
 
2.75
2.80
V
t
INV-OVP
 
Over-Voltage Protection Debounce Time
50
70
90
V
INV-UVP
 
Under-Voltage Protection for INV Input
0.35
0.45
0.55
V
t
INV-UVP
 
Under Voltage Protection Debounce Time
50
70
90
V
INV-FB-Latch
    INV Threshold Voltage for Blocking FB latch
0.7
0.8
0.9
V
V
INV-BO
 
PWM and PFC Off Threshold for Brownout Protection
1.15
1.20
1.25
V
V
INV-BO2
 
PWM Off Threshold Voltage for Brownout Protection,
PFC Off
0.7
0.8
0.9
V
V
COMP
 
Comparator Output High Voltage
4.8
 
6.0
V
V
OZ
 
Zero Duty Cycle Voltage on COMP Pin
1.15
1.25
1.35
V
I
COMP
 
Comparator Output Source
Current
V
INV
=2.3 V,
V
COMP
=1.5 V
15
25
35
V
INV
=1.5 V
0.50
0.75
1.00
mA
Comparator Output Sink Current
RANGE=Open,
V
INV
=2.75 V,
V
COMP
=5 V
20
30
40
RANGE=Ground,
V
INV
=2.65 V,
V
COMP
=5 V
20
30
40
PFC Current Sense Section 
V
CSPFC
 
Threshold Voltage for Peak
Current Cycle-by-Cycle Limit
V
COMP
=5 V
 
0.60
 
V
t
PD
 
Propagation Delay
 
110
200
ns
t
BNK
 
Leading-Edge Blanking Time
110
180
250
ns
A
V
 
CSPFC Compensation Ratio for THD
0.90
0.95
1.00
 
Continued on the following page&
 
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