FAN6749 Fairchild Semiconductor, FAN6749 Datasheet - Page 8

• 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
GATE Section
RT Section
Over-Temperature Protection Section (OTP)
Notes:
4.
5.
6.
I
V
Symbol
I
GATE-SOURCE
Symbol
GATE-SINK
DD
V
V
GATE-CLAMP
V
V
t
t
T
D
D-OTP1
D-OTP2
R
GATE-L
GATE-H
T
Restart
=15V and T
RTTH1
RTTH2
I
MAX
t
OTP
OTP
When activated, the output is disabled and the latch is turned off.
The threshold temperature for enabling the output again and resetting the latch after OTP has been activated.
Guaranteed by design.
t
RT
r
f
Maximum Duty Cycle
Gate Low Voltage
Gate High Voltage
Gate Rising Time (20-80%)
Gate Falling Time (80-20%)
Gate Sink Current
Gate Sourcing Current
Gate Output Clamping Voltage
Output Current of RT Pin
Threshold Voltage for Over-Temperature
Protection
Threshold Voltage for Latch Triggering
Maximum External Resistance of RT Pin
to Trigger Latch Protection
Debounce Time for Over-Temperature
Protection Triggering
Debounce Time for Latch Triggering
Protection Junction Temperature
Restart Junction Temperature
A
=25C unless otherwise noted.
Parameter
Parameter
(6)
(6)
(Continued)
Figure 8. Soft Gate-Driving Waveform
(5, 6)
(4,6)
V
V
V
V
V
V
V
0.7V ＜ V
14ms Latch Off
V
Latch Off
V
V
DD
DD
DD
DD
DD
DD
DD
RT
RTTH2
RT
8
=15V, I
=12V, I
=15V, C
=15V, C
=15V
=15V, GATE=6V
=22V
< V
＜ 0.7V, After 165µs
＜ V
Conditions
Conditions
RTTH2
RT
O
O
RT
L
L
=50mA
=50mA
＜ 1.05V, After
=1nF
=1nF
＜ V
RTTH1
1.015
Min.
Min.
0.65
9.66
11.0
250
300
90
11
90
80
60
15
8
T
10.50
1.050
+135
Typ.
OTP
Typ.
0.70
14.5
100
165
14
85
75
25
-25
Max.
Max.
1.085
11.34
18.0
0.75
110
240
1.5
www.fairchildsemi.com
90
90
35
18
Unit
Unit
mA
mA
µA
kΩ
ms
ns
ns
°C
°C
µs
%
V
V
V
V
V