FAN6749 Fairchild Semiconductor, FAN6749 Datasheet - Page 7

• Manufacturer Part Number: FAN6749
• Description: The FAN6749 highly integrated PWM controller enhances the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2012 Fairchild Semiconductor Corporation
FAN6749 • Rev. 1.0.0
Electrical Characteristics
V
Feedback Input Section
Current-Sense Section
Symbol
V
V
V
DD
V
V
V
V
V
V
FB-ZDCR -
V
t
FB-OPEN
t
V
V
FB-ZDCR
FB-ZDC
FB-ZDC
D-OCP
FB-OLP
D-OLP
LIMIT-L
LIMIT-H
t
Z
OCP-H
=15V and T
OCP-L
S
t
t
A
FB-G
LEB
FB-N
PD
SS
FB
V
G
Input Voltage to Current-Sense
Attenuation
FB Internal Pull-High Impedance
FB internal Biased Voltage
Threshold Voltage for OLP
Debounce Time for OLP
Threshold Voltage for Maximum
Switching Frequency
Threshold Voltage for Minimum Switching
Frequency
Slope for Green-Mode Modulation
Threshold Voltage for Zero Duty Cycle
Recovery
Threshold Voltage for Zero Duty Cycle
Zero Duty Cycle Hysteresis
Delay to Output
Leading-Edge Blanking
Current Limit Level at Low Line
(V
Current Limit Level at High Line
(V
OCP Trigger Level at Low Line
(V
OCP Trigger Level at High Line
(V
Soft-start time
Debounce Time for OCP
AC-RMS
AC-RMS
AC-RMS
AC-RMS
A
=25C unless otherwise noted.
= 86V)
= 259V)
=86V)
=259V)
Parameter
PWM Frequency
f
f
OSC-G
OSC
V
FB-ZDC
(Continued)
Figure 7. V
V
FB-ZDCR
V
FB-G
FB
FB Pin Open
Pin, FB Voltage(V
Pin, FB Voltage(V
V
to HV
V
to HV
V
to HV
V
to HV
Startup Time
V
vs. PWM Frequency
DC
DC
DC
DC
SENSE
7
=122V, Series R=200kΩ
=366V, Series R=200kΩ
=122V, Series R=200kΩ
=366V, Series R=200kΩ
>V
Conditions
OCP
V
FB-N
FB
FB
=V
=V
FB-N
FB-G
)
)
0.790
0.690
Min.
1/4.5
1000
2.05
0.05
0.45
0.39
Continued on the following page…
230
5.2
4.3
2.5
1.9
1.8
4.5
15
40
V
FB
0.825
0.725
Typ.
1/4.0
1400
2.25
0.10
0.48
0.42
270
5.4
4.6
2.7
2.1
2.0
6.0
17
56
85
65
Max.
0.860
0.760
1/3.5
1800
2.45
0.15
0.51
0.45
200
310
5.6
4.9
2.9
2.3
2.2
7.5
19
72
www.fairchildsemi.com
Hz/mV
Unit
V/V
ms
ms
ms
kΩ
ns
ns
V
V
V
V
V
V
V
V
V
V
V