FA5640 Datasheet, PDF (9/35 Pages) Fuji Electric – Fuji Switching Power Supply Control IC

FA5640/41/42
Zero current detection part (ZCD pin)
Item
Input threshold voltage
Hysteresis
Minimum detectable
pulse width
Symbol
Vthzcd1
Vthzcd2
Vhyzcd
Tzcdmin
Input clamp voltage
ZCD pin internal ｒesistance
ZCD pin propagation delay time
Vih
Vil
Rzcd
Tzcd
Tb12
The ON/OFF pulse width of
changed number of bottom at
turn-on
Tb21
Tb23
Tb32
Tb34
Tb43
Timeout after last ZCD trigger
Trestart
Conditions
Vzcd decreasing
Vzcd increasing
Vthzcd2-Vthzcd1
ZCD input pulse
Vpulse=1V to 0V
f=100kHz
Izcd=+3mA
（high state）
Izcd=-2mA
（low state）
Vzcd=1V to 5V
ZCD pulse:1V to 0V,
OUT: turn-on
Changed 1st bottom to
2nd bottom
Changed 2nd bottom to
1st bottom
Changed 2nd bottom to
3rd bottom
Changed 3rd bottom to
2nd bottom
Changed 3rd bottom to
4th bottom
Changed 4th bottom to
3rd bottom
FA5640,FA5642
OUT=low, Vzcd=0V
FA5641
OUT=low, Vzcd=0V
MIN.
40
100
30
300
6.5
-1.0
22.5
50
8.1
12.6
7.2
10.5
6.3
9.0
20
6.7
TYP.
60
150
90
－
MAX. Unit
80
mV
220
mV
150
mV
－
ns
7.5
9.5
V
-0.8
-0.4
V
30
37.5
kΩ
150
300
ns
9.0
9.9
us
14.0
15.4
us
8.0
8.8
us
11.67 12.84 us
7.0
7.7
us
10.0
11.0
us
25
30
us
7.6
8.5
us
Over-voltage protection part (ZCD pin)
Item
Symbol
Over-voltage threshold voltage
Vovp
Over-voltage detection timing
Delay time to latch-off
Tlat1
Tlaｔ2
Conditions
Vzcd is increased, and
timer latch function is
operated
Delay from turn-off
Delay from upper the
Vovp voltage
MIN.
5.7
3.5
40
TYP. MAX. Unit
6.0
6.3
V
4.5
5.5
us
60
80
us
Overload protection part (FB pin)
Item
OLP threshold voltage
Symbol
Conditions
Volp1 Vfb increasing
Volp2 Vfb decreasing
MIN.
3.3
3.0
Hysteresis
Hysolp Volp1-Volp2
0.1
Fault time duration
Delay from
Tolp
140
Vfb>Volp1
Auto recovery mode latch-off
The OFF time only by
Toff
980
time duration
internal signal
TYP.
3.5
3.3
0.2
200
1400
MAX. Unit
3.8
V
3.6
V
0.3
V
260
ms
1820 ms
Fuji Electric Co., Ltd.
AN-064E Rev.1.1
April 2011
9
http://www.fujielectric.co.jp/products/semiconductor/