FAN6791 Datasheet, PDF (8/19 Pages) Fairchild Semiconductor – Highly Integrated, Dual-PWM Combination Controller

Electrical Characteristics
VDD=18V; RI=24kΩ;TA =25°C, unless noted.
Symbol
Parameter
Conditions
ON/OFF
RON/OFF Impedance ON/OFF Pin
VON
High Threshold Level of
Synchronizing Signal
VOFF
Low Threshold Level of
Synchronizing Signal
Over Temperature Protection (OTP)
TOff
TRestart
Protection Junction
Temperature⁽¹⁾
Restart Junction Temperature⁽²⁾
Flyback PWM Stage
FBFYB Feedback Input
AV-FLY
FB Input to Current Comparator
Attenuation
ZFB
Input Impedance
VHGH
Output High Voltage
FB Pin Open
VFB-OLP FB Open-Loop Trigger Level
tOLP
FB Open-Loop Protection Delay
VN
Green Mode Entry FB Voltage
SG
Slope of Green-Mode Modulation
VG
Green Mode Ending FB Voltage
VOZ-OFYB
VFBPWM for Zero Duty Cycle
(Forward Turn On)
IFYB Current Sense
ZCS
VLIMIT1
Input Impedance
Peak Current Limit Threshold
Voltage 1
VRMS=1V
VLIMIT2
Peak Current Limit Threshold
Voltage 2
VRMS=1.5V
tPD
Propagation Delay to GATE
Output
tBNK
Leading-Edge Blanking Time
ΔVSLOPE Slope Compensation
VS-SCP
Threshold Voltage for SENSE
Short-Circuit Protection
tD-SSCP
Delay Time for SENSE Short-
Circuit Protection
OFYB-GATE Driver
VDD=15V, OFYB Drops
to 9V
Duty=DCYMAX
VSENSE<0.15V,
RI=24KΩ
VOFYB-CLAMP
Flyback PWM Gate Output
Clamping Voltage
VDD=22V
VOL-OFYB
VOH-OFYB
tR-OFYB
Output Voltage Low
Output Voltage High
Rising Time
tF-OFYB Falling Time
DCYMAX-OFYB Maximum Duty Cycle
VDD=15V; IO=20mA
VDD=12V; IO=20mA
VDD=15V; Gate=1nF;
Gate=2~9V
VDD=15V; Gate=1nF;
Gate=9~2V
© 2008 Fairchild Semiconductor Corporation
FAN6791 / FAN6793 • Rev. 1.0.2
8
Min.
50
2.4
0.8
Typ.
3.0
1.0
Max. Units
100
kΩ
3.6
V
1.2
V
130
140
+150
°C
100
110
+120
°C
1/3.75
4
5.0
4.2
53
2.4
60
1.8
1.2
1/3.20
5
5.2
4.5
56
2.5
75
1.9
1.3
1/2.75
7
4.8
59
2.6
90
2.0
1.4
V/V
kΩ
V
V
ms
V
Hz/mV
V
V
12
kΩ
0.75
0.80
0.85
V
VLIMIT1 -0.1
V
60
120
ns
200
270
350
ns
0.34
0.37
0.41
V
0.1
0.15
0.2
V
100
180
240
µs
16
18
V
1.5
V
8
V
30
60
120
ns
30
50
90
ns
60
65
70
%
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