FA5546 Datasheet, PDF (8/27 Pages) Fuji Electric – Switching Power Supply Control IC

FA5546/47
Over load protection(OLP) circuit section (FB pin)
Item
Symbol Conditions
Over load detection
threshold voltage *1
Over load detection
Delay time
Waiting time of auto restart
*1
VthOLP
TdOLP
TdOLP2
VFB=4V
VFB=4V
FA5546
MIN TYP MAX Unit
2.4
2.8
3.2
V
170
200
230
ms
1200 1400 1600
ms
Current sense section (IS pin)
Item
Symbol Conditions
Voltage gain
AvIS ΔVFB/ΔVIS
Maximum threshold
voltage
Over load detection
threshold voltage *1
VthIS1 VFB=3V
VthIS2 VFB=VthOLP
Input bias current
IIS VIS=0V
Minimum ON pulse width
Tmin
Steady
Start/Restart
Delay to output *1
TpdIS Tj=25℃
MIN TYP MAX Unit
-3.5
-3.0
-2.5
V/V
-1.05 -0.95 -0.85
V
-0.70 -0.63 -0.56
V
-50
-40
-30
uA
950 1250 1500
ns
180
280
380
ns
50
200
300
ns
VCC circuit section (VCC pin)
Item
Start-up threshold voltage
Symbol Conditions
VCCon
Shutdown threshold voltage VCCoff
Hysteresis width
VCC over-voltage protection
threshold voltage
Vhys
Vthovp Tj=25℃
Output circuit section (OUT pin)
Item
Low output voltage
High output voltage *1
Rise time *1
Fall time *1
Symbol
VOL
VOH
tr
tf
Conditions
IOL=100mA,
VCC=18V
IOH= -100mA,
VCC=18V
CL=1000pF,
Tj=25℃
CL=1000pF ,
Tj=25℃
MIN TYP MAX Unit
16
18
20
V
8.8
9.8
10.8
V
6.8
8.2
9.6
V
25
26
27
V
MIN TYP MAX Unit
0.5
1.0
2.0
V
(14.5) (16)
17
V
30
60
100
ns
20
40
70
ns
Fuji Electric Co., Ltd.
AN-027E Rev.0.4
April -2011
8
http://www.fujielectric.co.jp/products/semiconductor/