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FA5641 Datasheet(PDF) 9 Page - Fuji Electric

Part # FA5641
Description  Fuji Switching Power Supply Control IC
Download  35 Pages
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Manufacturer  FUJI [Fuji Electric]
Direct Link  http://www.fujielectric.co.jp/eng/fdt/scd
Logo FUJI - Fuji Electric

FA5641 Datasheet(HTML) 9 Page - Fuji Electric

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


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