FA551 Datasheet, PDF (3/22 Pages) List of Unclassifed Manufacturers – CMOS IC For Switching Power Supply Control

FA551X
■ Electrical characteristics (VCC=18V, RT=47kΩ, Ta=25˚C)
Reference voltage section (REF pin)
Item
Reference voltage
Line regulation
Load regulation
Temperature stability
Symbol
VREF
Vdv1
Vdv2
VdT
Test condition
Tj=25˚C
VCC=10 to 28V
IL=0 to 10mA, VCC=18V
Ta=–30 to 85˚C
Min.
4.75
–40
Typ.
5.00
±6
–12
±0.5
Max.
5.25
±20
Unit
V
mV
mV
mV/˚C
Oscillator section (RT pin)
Item
Oscillation frequency
Voltage stability
Temperature stability
Symbol
fOSC
fdv
fdT
Test condition
RT=47kΩ, Tj=25˚C
VCC=10 to 28V
Ta=–30 to 85˚C
Min.
92.6
Typ.
100
±1.0
±0.02
Max.
107.4
Unit
kHz
%
%/˚C
Pulse width modulation circuit section (FB pin)
Item
FB pin source current
Input threshold voltage (FB pin)
Maximum duty cycle
Symbol
IFB
VTH FB0
VTH FBM
DMAX
Test condition FA5510/14
FA5511/15
Unit
Min. Typ. Max. Min. Typ. Max.
VFB=0
–855 –720 –585 –855 –720 –585 µA
Duty cycle =0% 0.9 1
0.9 1
V
Duty cycle =DMAX
1.92
2.40
V
42 46 50 66 70 74 %
Overcurrent limiting circuit section (IS pin)
Item
Input threshold voltage (IS pin)
Source current (IS pin)
Delay time
Symbol
VTHIS
IIS
tpdIS
Test condition
VIS=0V
FA5510/11
FA5514/15
Unit
Min. Typ. Max. Min. Typ. Max.
220 240 260 –190 –170 –150 mV
±5 –28 –20 –12 µA
150
150
ns
Soft start circuit section (CS pin)
Item
Charge current (CS pin)
Input threshold voltage (CS pin)
Symbol
ICHG
VTH CS0
VTH CSM
Test condition FA5310/14
Min. Typ.
VCS=1V, Tj=25˚C –7.2 –5.2
Duty cycle =0% 0.90 1.0
Duty cycle =DMAX
1.92
FA5311/15
Max. Min. Typ.
–3.2 –7.2 –5.2
0.90 1.0
2.40
Unit
Max.
–3.2 µA
V
V
Output ON/OFF control circuit section (CS pin)
Item
Source current (CS pin)
ON/OFF control threshold voltage (CS pin)
Hysteresis voltage
Symbol
IS0CS
VTHON
VTHOFF
VTHOHS
Test condition
VCS=0V, Tj=25˚C
OFF→ON, Tj=25˚C
ON→OFF, Tj=25C
Min.
–7.2
0.50
Typ.
–5.2
0.8
0.68
0.12
Max. Unit
–3.2 µA
0.93 V
V
V
3