FSCQ-SERIES
Electrical Characteristics (Continued)
(Ta=25°C unless otherwise specified)
Parameter
Symbol
Condition
Min. Typ. Max. Unit
Sync SECTION
Sync Threshold in Normal QR (H)
Sync Threshold in Normal QR (L)
Sync Threshold in Extended QR (H)
Sync Threshold in Extended QR (L)
Extended QR Enable Frequency
Extended QR Disable Frequency
TOTAL DEVICE SECTION
Operating Supply Current (1)
V
4.2
2.3
2.7
1.6
-
4.6
2.6
3.0
1.8
90
5.0
2.9
3.3
2.0
-
V
V
SH1
V
SL1
V
V
SH2
V
= 18V, V = 5V
FB
CC
V
V
SL2
F
kHz
kHz
SYH
F
-
45
-
SYL
FSCQ0565RT
FSCQ0765RT
FSCQ0965RT
FSCQ1265RT
FSCQ1465RT
FSCQ1565RT
FSCQ1565RP
-
-
-
-
-
-
-
-
-
-
4
4
6
6
7
7
7
6
6
8
8
9
9
9
- In Normal Operation
I
V
= 5V
FB
mA
OP
- In Burst Mode (Non-switching)
Startup Current
Sustain Latch Current(3)
I
V
V
V
= GND
0.25 0.50 mA
OB
FB
CC
CC
I
= V -0.1V
START
25
50
50
uA
uA
START
I
= V -0.1V
STOP
100
SN
CURRENT SENSE SECTION
FSCQ0565RT
FSCQ0765RT
FSCQ0965RT
FSCQ1265RT
FSCQ1465RT
FSCQ1565RT
FSCQ1565RP
FSCQ0565RT
FSCQ0765RT
FSCQ0965RT
3.08 3.5 3.92
4.4 5.6
5.28 6.0 6.72
VCC = 18V, V = 5V 6.16 7.84
5
Maximum Current Limit (2)
I
7
A
LIM
FB
7.04 8.0 8.96
7.04 8.96
8
10.12 11.5 12.88
0.45 0.65 0.85
0.65 0.9 1.15
0.6
0.9
1.2
0.9
1
1.2
1.6
1.2
-
Burst Peak Current
I
FSCQ1265RT VCC = 18V, V = Pulse 0.8
FB
A
BUR(pk)
FSCQ1465RT
FSCQ1565RT
FSCQ1565RP
0.6
-
-
1
-
Note:
1. This parameter is the current flowing in the control IC.
2. These parameters indicate inductor current.
3. These parameters, although guaranteed, are tested only in EDS (wafer test) process.
8
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
