FAN6791 Fairchild Semiconductor, FAN6791 Datasheet - Page 9

• Manufacturer Part Number: FAN6791
• Description: The highly integrated FAN6791/3 dual PWM combination controller provides several features to enhance the performance of converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN6791 / FAN6793 • Rev. 1.0.3
Electrical Characteristics
V
ON/OFF
Over Temperature Protection (OTP)
Flyback PWM Stage
FBFYB Feedback Input
IFYB Current Sense
OFYB-GATE Driver
V
DD
Symbol
OFYB-CLAMP
V
V
V
ΔV
R
V
t
t
T
V
V
V
t
A
=18V; R
OZ-OFYB
OL-OFYB
OH-OFYB
V
D-SSCP
R-OFYB
F-OFYB
V
ON/OFF
V
FB-OLP
t
Restart
t
Z
T
Z
LIMIT1
LIMIT2
S-SCP
V-FLY
V
S
V
t
OLP
BNK
SLOPE
HGH
OFF
PD
ON
Off
FB
CS
N
G
G
I
=24kΩ;T
Impedance ON/OFF Pin
High Threshold Level of
Synchronizing Signal
Low Threshold Level of
Synchronizing Signal
Protection Junction
Temperature
Restart Junction Temperature
FB Input to Current Comparator
Attenuation
Input Impedance
Output High Voltage
FB Open-Loop Trigger Level
FB Open-Loop Protection Delay
Green Mode Entry FB Voltage
Slope of Green-Mode Modulation
Green Mode Ending FB Voltage
V
Cycle(Forward Turn On)
Input Impedance
Peak Current Limit Threshold
Voltage 1
Peak Current Limit Threshold
Voltage 2
Propagation Delay to GATE
Output
Leading-Edge Blanking Time
Slope Compensation
Threshold Voltage for SENSE
Short-Circuit Protection
Delay Time for SENSE Short-
Circuit Protection
Flyback PWM Gate Output
Clamping Voltage
Output Voltage Low
Output Voltage High
Rising Time
Falling Time
FBPWM
A
=25°C, unless noted.
for Zero Duty
Parameter
(1)
(2)
FB Pin Open
V
V
V
to 9V
Duty=DCY
V
R
V
V
V
V
Gate=2~9V
V
Gate=9~2V
RMS
RMS
DD
SENSE
DD
DD
DD
DD
DD
I
=24KΩ
=15V, OFYB Drops
=22V
=15V; I
=12V; I
=15V; Gate=1nF;
=15V; Gate=1nF;
=1V
=1.5V
Conditions
<0.15V,
9
MAX
O
O
=20mA
=20mA
1/3.75
Min.
0.75
0.34
130
100
200
100
2.4
0.8
5.0
4.2
2.4
1.8
1.2
0.1
50
53
60
60
30
30
4
8
V
LIMIT1
1/3.20
Typ.
0.80
0.37
0.15
140
110
270
180
3.0
1.0
5.2
4.5
2.5
1.9
1.3
56
75
12
16
60
50
5
-0.1
1/2.75
Max.
+150
+120
0.85
0.41
100
120
350
240
120
3.6
1.2
4.8
2.6
2.0
1.4
0.2
1.5
59
90
18
90
7
www.fairchildsemi.com
Hz/mV
Units
V/V
kΩ
ms
°C
°C
kΩ
kΩ
ns
ns
µs
ns
ns
V
V
V
V
V
V
V
V
V
V
V
V
V
V