FAN6751MR Fairchild Semiconductor, FAN6751MR Datasheet - Page 6

• Manufacturer Part Number: FAN6751MR
• Description: The highly integrated FAN6751 series of PWM controllers provides several features to enhance the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN6751MR • Rev. 1.0.0
Electrical Characteristics
V
Feedback Input Section
Current-Sense Section
Symbol
V
V
V
V
V
V
V
DD
Z
t
V
FB-OPEN
t
V
V
D-SSCP
TH-P
TH-P
FB-OLP
D-OLP
FB-ZDC
IN
IN
SENSE
t
Z
S-SCP
T
A
t
=15V, T
FB-N
FB-G
LEB
PD
=1V
=3V
FB
SS
V
at
at
A
Input Voltage to Current-Sense
Attenuation
Input Impedance
Output High Voltage
FB Open-loop Trigger Level
Delay Time of FB Pin Open-loop
Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Zero Duty-Cycle Input Voltage
Input Impedance
Threshold Voltage for Current Limit
Threshold Voltage for Current Limit
Delay to Output
Leading-Edge Blanking Time
Threshold Voltage for SENSE Short-
Circuit Protection
Delay Time for SENSE Short-Circuit
Protection
Period During Soft-Startup Time
=25°C, unless otherwise noted.
Parameter
PWM Frequency
f
f
OSC
OSC-G
V
Figure 5. V
FB-ZDC
V
FB-G
FB
FB Pin Open
V
V
V
Startup Time
vs. PWM Frequency
IN
IN
SENSE
Conditions
6
=1V
=3V
<0.15V
V
FB-N
Min.
1/4.5
0.80
0.67
0.10
100
230
5.5
5.0
4.5
4
V
FB
Typ.
1/4.0
0.83
0.70
0.15
100
280
150
5.2
2.1
1.6
1.1
5.0
56
12
Max.
1/3.5
0.86
0.73
0.20
200
330
200
5.4
5.5
7
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Units
V/V
ms
KΩ
ms
kΩ
ns
ns
µs
V
V
V
V
V
V
V
V