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参数资料
| 型号： | FA5501AN |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDSO8 |
| 封装： | SO-8 |
| 文件页数： | 17/26页 |
| 文件大小： | 228K |
| 代理商： | FA5501AN |
FA5500AP/AN, FA5501AP/AN
24
Quality is our message
(2)Improving operation around
zero-crossing
The dead time of AC input current may appear
around zero crossing. A high value resistor R12
(several 100k or several Meg
) connected between
MUL pin and Vcc pin may reduce the dead time. But too
much correction, which means connecting too small
resistance, causes distortion of AC input current or
overvoltage at light load. Be careful when R12 is
connected.
0
t
Iin
Fig.29
Input current including dead time
3
C1
R3
R4
C6
MUL
8
VCC
R12
Fig.30
Compensation circuit of dead time
On the other hand, surge current may appear around
zero crossing in some application.
This surge current can influence harmonic currents. In
this case, a high value resistor R13 (several 100k or
several Meg
) connected between IS pin and Vcc pin
may suppress this surge current.
0
Fig.31
Input current including surge current
4
L1
D1
C1
Q1
C2
Rs
R6
C4
IS
8
VCC
R13
Fig.32
Compensation circuit of surge current
(3)Prevent malfunction caused by negative
voltage applied to a pin
When large negative voltage is applied to each IC pin,
a parasitic element in the IC may operate and cause
malfunction. Be careful not to allow the voltage applied
to each pin to drop below -0.3V. Especially for the OUT
pin, voltage oscillation caused after the MOSFET turns
off may be applied to the OUT pin via the parasitic
capacitance of the MOSFET, causing the negative
voltage to be applied to the OUT pin. If the voltage falls
below -0.3V, add a Schottky diode between the OUT
pin and the ground. The forward voltage of the Schottky
diode can suppress the voltage applied to the OUT pin.
Use the low forward voltage of the Schottky diode.
OUT
SBD
7
R8
Rs
Fig.33
Protection circuit of OUT pin against the
negative voltage
Similarly, be careful not to cause the voltages at other
pins to fall below -0.3V.
(4)Prevent malfunction caused by noise
Noise applied to each pin may causes malfunction of
IC. Capacitor of RC filter for IS pin and MUL pin should
be connected as close as possible to suppress noise
effectively.
Noise applied to COMP
pin may also cause
malfunction. The capacitor between COMP and GND
pin should be connected as close as possible, too.
(5)Open/short protection at FB pin
This IC has Open/short protection at FB pin circuit,
which shuts off output, if complete open circuit or short
circuit failures may occur on voltage divider for
monitoring PFC output voltage. But, if voltage divider
resistance varies because of degradation, this circuit
may not protect enough. Therefore, be sure to consider
and evaluate your set, component characteristics and
the like sufficiently, and then design an additional
protection circuit if needed.
相关PDF资料 |
PDF描述 |
|---|---|
| FA5501AP | 1 A SWITCHING CONTROLLER, PDIP8 |
| FA5500AN | 1 A SWITCHING CONTROLLER, PDSO8 |
| FA5500AP | 1 A SWITCHING CONTROLLER, PDIP8 |
| FA5516N | 1 A SWITCHING CONTROLLER, 143 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA5517N | 1 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| FA5502M-TE1 | 制造商:Fuji Electric 功能描述:1.5 A POWER FACTOR CONTROLLER, 150 kHz SWITCHING FREQ-MAX, 16 Pin Plastic SOP 制造商:Fuji Semiconductors, Inc. 功能描述:1.5 A POWER FACTOR CONTROLLER, 150 kHz SWITCHING FREQ-MAX, 16 Pin Plastic SOP |
| FA5502P/M | 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. |
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