Data Sheet

© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSQ0365, FSQ0265, FSQ0165, FSQ321 • Rev. 1.0.6 7
FSQ0365/0265/0165/321 — Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter
Electrical Characteristics (Continued)
T
A
=25C unless otherwise specified.
Symbol Parameter Conditions Min. Typ. Max. Unit
Control Section
t
ON.MAX1
Maximum On Time1
All but
FSQ321
T
J
=25°C 10.5 12.0 13.5 µs
t
ON.MAX2
Maximum On Time2 FSQ321 T
J
=25°C 6.35 7.06 7.77 µs
t
B1
Blanking Time1
All but
FSQ321
13.2 15.0 16.8 µs
t
B2
Blanking Time2 FSQ321 7.5 8.2 µs
t
W
Detection Time Window T
J
=25°C, V
sync
=0V 3.0 µs
f
S
Switching Frequency Variation
(14)
-25C < T
J
< 85C
±5 ±10 %
I
FB
Feedback Source Current V
FB
=0V 700 900 1100 µA
D
MIN
Minimum Duty Cycle V
FB
=0V 0 %
V
START
UVLO Threshold Voltage After Turn-on
11 12 13 V
V
STOP
7 8 9 V
t
S/S1
Internal Soft-Start Time 1
All but
FSQ321
With Free-Running
Frequency
15 ms
t
S/S2
Internal Soft-Start Time 2 FSQ321
With Free-Running
Frequency
10 ms
Protection Section
I
LIM
Peak Current Limit
FSQ0365 T
J
=25°C, di/dt=240mA/µs 1.32 1.50 1.68
A
FSQ0265 T
J
=25°C, di/dt=200mA/µs 1.06 1.20 1.34
FSQ0165 T
J
=25°C, di/dt=175mA/µs 0.8 0.9 1.0
FSQ321 T
J
=25°C, di/dt=125mA/µs 0.53 0.60 0.67
V
SD
Shutdown Feedback Voltage V
CC
=15V 5.5 6.0 6.5 V
I
DELAY
Shutdown Delay Current V
FB
=5V 4.0 5.0 6.0 µA
t
LEB
Leading-Edge Blanking Time
(13)
200 ns
V
OVP
Over-Voltage Protection V
CC
=15V, V
FB
=2V 5.5 6.0 6.5 V
t
OVP
Over-Voltage Protection Blanking
Time
2 3 4 µs
T
SD
Thermal Shutdown Temperature
(13)
125 140 155 °C
Sync Section
V
SH
Sync Threshold Voltage
0.55 0.70 0.85 V
V
SL
0.14 0.20 0.26 V
t
Sync
Sync Delay Time
(13,14)
300 ns
Total Device Section
I
OP
Operating Supply Current
(Control Part Only)
V
CC
=15V 1 3 5 mA
I
START
Start Current
V
CC
=V
START
- 0.1V
(Before V
CC
Reaches V
START
)
270 360 450 µA
I
CH
Startup Charging Current V
CC
=0V, V
STR
=Minimum 40V 0.65 0.85 1.00 mA
V
STR
Minimum V
STR
Supply Voltage 26 V
Notes:
11. Pulse test: Pulse-Width=300s, duty=2%.
12. Propagation delay in the control IC.
13. Though guaranteed, it is not 100% tested in production.
14. Includes gate turn-on time.