?2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6920MR " Rev. 1.0.8
10
Electrical Characteristics (Continued)
V
DD
=15 V and T
A
=25癈 unless otherwise noted.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
PWM STAGE
Feedback Input Section
A
V
Input-Voltage to Current Sense
Attenuation
(4)
V
=DV
CS
/DV
FB
,
< V
CS
< 0.9
1/2.75 1/3.00 1/3.25
V/V
Z
FB
Input Impedance
(4)
FB
> V
G
3
5
7
k?
I
OZ
Bias Current
FB
=V
OZ
1.2
2.0
mA
V
OZ
Zero Duty Cycle Input Voltage
0.7
0.9
1.1
V
V
FB-OLP
Open-Loop Protection Threshold
Voltage
3.9
4.2
4.5
V
t
FB-OLP
The Debounce Time for Open-Loop
Protection
40
50
60
ms
t
FB-SS
Internal Soft-Start Time
(4)
FB
=0 V~3.6 V
4
5
6
ms
DET Pin OVP and Valley Detection Section
V
DET-OVP
Comparator Reference Voltage
2.45
2.50
2.55
V
Av
Open-Loop Gain
(4)
60
dB
BW
Gain Bandwidth
(4)
1
MHz
t
DET-OVP
Output OVP (Auto-Recovery) Debounce
Time
100
150
200
祍
I
DET-SOURCE
Maximum Source Current
DET
=0 V
1
mA
V
DET-L W
Lower Clam Volta e
I
DET
=1 mA
0.15
0.25
0.35
V
t
VALLEY-DELAY
Delay Time from Valley Signal Detected
to Output Turn-On
(4)
150
200
250
ns
t
OFF-BNK
Leading-Edge Blanking Time for DET-
OVP (2.5 V) and Valley Signal when
PWM MOS Turns Off
(4)
2.5
祍
t
TIME-OUT
Time-Out After t
OFF-MIN
(4)
8
9
10
祍
PWM Oscillator Section
t
ON-MAX-PWM
Maximum On-Time
38
45
52
祍
t
OFF-MIN
Minimum Off-Time
FB
g V
N
, T
A
=25癈
5
祍
FB
=V
G
20.5
V
N
Beginning of Green-On Mode at FB
Voltage Level
1.95
2.10
2.25
V
V
G
Beginning of Green-Off Mode at FB
Voltage Level
1.00
1.15
1.30
V
擵
G
Hysteresis for Beginning of Green-Off
Mode at FB Voltage Level
(4)
0.1
V
Continued on the following page&
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