FA5546 Datasheet, PDF (7/27 Pages) Fuji Electric – Switching Power Supply Control IC

FA5546/47
(2) Recommended operating condition
Item
VCC Power supply voltage
Symbol
MIN
VCC
11
TYP
MAX
Unit
18
22
V
Direct voltage
VVH(DC)
100
450
V(DC)
High input voltage
Half-wave
rectification
VVH(AC1)
80
Full-wave
VVH(AC2)
80
rectification
VH pin Resistance
RVH
2
288
V(AC)
288
V(AC)
---
10
k ohm
LAT pin capacity
CLAT
0.22
1.0
2.2
uF
VCC pin capacity
CVCC
10
33
100
uF
Operating ambient temperature
Ta
-30
85
℃
(3) Electric characteristics (in case nothing specified : Tj=25℃, VCC=18V)
Switching oscillator section (FB pin)
Item
Symbol Conditions
MIN TYP
Oscillation frequency
Fosc VFB=3V
54
60
Voltage stability
Fdv VCC：11V to 24V
-2
－
Temperature stability *1
FB pin threshold voltage
for light load mode
Oscillation frequency
reduction ratio
Minimum oscillation
frequency
Fdt
Vfbm
kf
Fmin
Tj= -30 to 125℃
Δf/ΔVfb
-5
－
0.95 1.15
200
240
0.22 0.34
MAX
66
Unit
kHz
+2
%
+5
%
1.35
V
280 kHz/V
0.50
kHz
External latch shutdown signal (LAT pin)
Item
Source current of LAT pin
Symbol
Ilat
Conditions
LAT=1.1V
Charge period
Latch-off level
VthLAT
Latch-off delay timer *1
TdLAT
MIN TYP MAX Unit
-80
-70
-60
uA
1.00 1.05 1.10
V
50
65
80
us
Pulse width modulation section (FB pin)
Item
Symbol Conditions
Maximum duty cycle
Dmax FB=4.5V
Minimum duty cycle
Dmin FB=0V
Input threshold voltage
VthFB0 DUTY=0%
FB pin source current
Ifb0 VFB=0V
Fuji Electric Co., Ltd.
AN-027E Rev.0.4
7
April -2011
MIN TYP MAX Unit
75
80
85
%
－
－
0
%
340
400
460
mV
-300 -250 -200
uA
http://www.fujielectric.co.jp/products/semiconductor/