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参数资料
| 型号： | FA5501AP |
| 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： | 9/26页 |
| 文件大小： | 228K |
| 代理商： | FA5501AP |
FA5500AP/AN, FA5501AP/AN
17
Quality is our message
A current out of or into the ZCD pin should be
within 3mA so that the IC will operate normally.
On the other hand, if the current out of or into the
ZCD pin is too small, unstable operation may occur.
Therefore, current limiting resistor of R5 should be
below 47k
.
While MOSFET is on, negative voltage is generated
in the auxiliary winding. A current flows out of the
clamp circuit and the ZCD pin voltage is clamped to
0.6V (typ.). While MOSFET is off, positive voltage is
generated in the auxiliary winding. A current flows into
the clamp circuit and the ZCD pin voltage is clamped to
7.6V (typ.).
Clamp
5
sub
R5
ZCD
ZCD.comp
0.6V
Q1 : ON
Clamp circuit
current
Fig.10
Clamp circuit of ZCD pin(1)
Clamp
5
sub
R5
ZCD
ZCD.comp
7.6V
Q1 : OFF
Clamp circuit
current
Fig.11
Clamp circuit of ZCD pin(2)
(7)Compensation circuit for light load
If the output of multiplier, which determines the
threshold of current comparator, does not have offset
voltage,
the
input
current
to
the
converter
is
approximately zero under condition that the PFC
converter operates in no load. But an actual multiplier
may have offset voltage. If the offset voltage is positive,
the input current, which corresponds to the offset
voltage, flows into the converter even when the PFC
converter operates in no load. In this case, the PFC
output voltage rises abnormally because of too much
input current.
To avoid these, this IC has an automatic offset
correction circuit (AOC) for light load. The output
voltage of error amplifier is approximately 2V or higher
in normal operation. When the output voltage of error
amplifier drops below 2V, AOC circuit operates.
If the output of multiplier has a positive offset, the
output voltage of error amplifier falls below 2V in the
case that the PFC converter operates in no load or light
load. Then, the offset voltage is corrected in the current
comparator by AOC circuit. Because of this operation,
even in the no load or light load condition, the PFC
output voltage does not rise abnormally, but is always
kept constant. The amount of correction changes
linearly according to the output of error amplifier so that
the operation can be made stable.
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| FA5517N | 1 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO8 |
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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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