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参数资料
| 型号： | FA5500AP |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 15/26页 |
| 文件大小： | 228K |
| 代理商： | FA5500AP |
FA5500AP/AN, FA5501AP/AN
22
Quality is our message
circuit ) The appropriate value of C8 and R10 should be
tested and determined in actual circuit because they
depend on each circuit.
R7
D2
D4
C5
C8
sub
VCC
R10
Fig.22
Vcc pin circuit (3)
(1-6)
MUL Pin circuit
The input voltage of MUL pin is related to IS pin
threshold voltage range. To prevent the distortion of AC
input current, the value of resistor divider R3 and R4
should be determined so that the maximum peak
voltage of MUL pin (VMUL-P(max)) is below 2.5V when
the AC line voltage is maximum.
2.5[V]
4
R
3
R
4
R
Vac(max)
2
V
(max)
P
MUL
<
+
×
=
3
C1
R3
R4
C6
MUL
Fig.23
MUL pin circuit
In an actual circuit, the rectified voltage contains
many noises from switching. To avoid this influence, a
capacitor C6 is typically connected between MUL pin
and GND pin. If the capacity of C6 is too small, the
filtering is not effective. If the capacity is too large, the
input voltage of MUL pin is distorted and then AC input
current is also distorted. In calculating, the cutoff
frequencies determined with C6 and R3, R4 should be
set to about 1 or 2kHz.
2[kHz]
or
1
4)
//R
3
(R
6
C
2
1
≈
×
π
×
Where;
R3//R4 represents the resistance of parallel
connection of R3 and R4.
(1-7)
IS Pin circuit
The input current becomes the greatest when AC line
voltage is minimum (Vac(min.)). Even in this case, it is
necessary to set the current detector resistance Rs so
that required input current can be supplied.
After setting a voltage divider connected to MUL pin,
the threshold voltage range of IS pin is calculated as
follows.
When AC line voltage is minimum, the minimum
clamp voltage of IS pin threshold voltage
(VthIS-P(min))
can
be calculated according to the
characteristics of multiplier and the input voltage range.
()
1
V
53
.
0
V
1
V
K
V
(min)
P
MUL
thcomp
(min)
P
MUL
(min)
p
thIS
×
=
+
×
=
Where,
VMUL-P(min): MUL pin peak voltage at minimum AC
line voltage
K(min.): multiplier gain
Note:
When VthIS-P(min) >1.3V, use VthIS-P(min) =1.3V.
Set the current sense resistance Rs in order to flow
necessary
current
even
when
clamp
voltage
is
VthIS-P(min). The maximum of the inductor peak current
(ILP(max.)) is approximately expressed with the following
equation.
.)
Vac(min
Po
2
.)
(max
ILP
×
η
×
=
Therefore, the value of Rs can be calculated with the
following equation.
.)
(max
I
V
Rs
LP
(min)
p
thIS
=
When MOSFET turns on, surge current caused by
driving MOSFET or discharging of parasitic capacitor
flows to Rs. This IC controls the peak current of
MOSFET. Therefore if this surge current is too large,
the AC input current can be distorted by malfunctions.
In addition, depending on the magnitude or timing of
surge current, irregular narrow pulses may appear on
the output pulses when OUT pin goes high. Therefore,
a RC filter R6 and C4 is typically connected. In order
not to influence normal operation, it is necessary to set
the cutoff frequency of RC filter higher than the
switching frequency. In this calculation, the cutoff
frequency is assumed about 1 or 2 MHz.
]
MHz
[
2
or
1
6
R
4
C
2
1
≈
×
π
×
4
L1
D1
C1
Q1
C2
Rs
R6
C4
IS
Fig.24
IS pin circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FA5500AP/AN | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| FA550-10PAK | 制造商:Black Box Corporation 功能描述:DB15 Male Transceiver Connector Kit, 10-Pack |
| FA5501AP/AN | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| FA5502 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FA5502P/M is a control IC for a power factor correction system. |
| FA5502M-H1 | 制造商:Fuji Electric 功能描述: |
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