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參數(shù)資料
| 型號： | FA551 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | CMOS IC For Switching Power Supply Control |
| 中文描述： | CMOS集成電路開關(guān)電源控制 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 259K |
| 代理商： | FA551 |
FA551X
9
■
Description of each circuit
1.
Oscillator
The oscillator generates a triangular waveform by charging and
discharging the built-in capacitor. A desired oscillation
frequency can be set by the value of the resistor connected to
the RT pin (See Figure 1).
The built-in capacitor voltage oscillates between about 3V and
1V, with almost the same charging and discharging gradients
(Figure 2). You can set the desired oscillation frequency by
changing the gradients using the resistor connected to the RT
pin. (Large R
T
=Low frequency, small R
T
=High frequency)
The relationship between R
T
and the oscillation frequency is
approximately given by:
The oscillator waveform cannot be observed from the outside
because the oscillator output is not pinned out. The oscillator
output is connected to a PWM comparator.
2. PWM comparator
The PWM comparator has four inputs as shown in Figure 3.
Oscillator output
is compared with CS pin voltage
voltage
, and DT voltage
. The lowest of three inputs
, and
has priority and is compared with oscillator output
While the voltage is lower than the oscillator output, the
comparator output is high. While the voltage is higher than the
oscillator output, the PWM comparator output is low (see Figure
4). The IC OUT pin voltage is high while the PWM comparator
output is low. When the IC is powered up, CS pin voltage
controls soft start operation. The output pulse then begins to
widen gradually. During normal operation, the output pulse
width is determined within the maximum duty cycle (FA5510/14:
46%, FA5511/15: 70%) set by DT voltage
condition set by FB pin voltage
voltage.
, FB pin
,
.
under the
, to stabilize the output
Fig. 1 Oscillator
Fig. 2 Oscillator output
Fig. 3 PWM comparator
Fig. 4 PWM comparator timing chart
R
T
RT
1
OSC
3V
1V
R
T
=Small
R
T
=Large
DT voltage
FB pin voltage
CS pin voltage
Oscillator
output
PWM comparator
output
FB pin voltage
PWM comparator
output
(4.0V)
OUT pin voltage
DT voltage
Oscillator output
CS pin voltage
f
OSC
: Oscillation frequency [kHz]
R
T
:
Timing resistance [k
]
f
OSC
4880
R
T
+ 1.4
[kHz]
R
T
4880– 1.4 [k
]
f
OSC
........................................................(1)
........................................................(2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FA5510N | CMOS IC For Switching Power Supply Control |
| FA5510P | CMOS IC For Switching Power Supply Control |
| FA5511N | CMOS IC For Switching Power Supply Control |
| FA5511P | CMOS IC For Switching Power Supply Control |
| FA5514N | CMOS IC For Switching Power Supply Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FA5510N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS IC For Switching Power Supply Control |
| FA5510P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS IC For Switching Power Supply Control |
| FA5510P-D1 | 制造商:Fuji Electric 功能描述:Bulk |
| FA551-10PAK | 制造商:Black Box Corporation 功能描述:DB15 Transceiver Connector Kit, Female, 10-Pack |
| FA5511N | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:PUJI Power Supply Controllc |
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