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參數(shù)資料
| 型號： | FA5510N |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 260K |
| 代理商： | FA5510N |
FA551X
14
Fig. 18
Startup circuit (1)
C2
C1
MOSFET
D1
T1
FA551X
~
+
DB
AC INPUT
R1
Rs
OUT
VCC
6
5
R1: Startup resistance [k
]
Vac: Effective value of AC input voltage [V]
■ Design advice
1. Deciding the startup circuit
These ICs, which use CMOS process, consume less current,
and therefore can use larger startup resistance than the
conventional bipolar type of IC. To decide the startup
resistance, the following conditions must be satisfied:
(a) The IC is started when the power is turned on.
(b) The IC consumption current is supplied during latch mode
operation to maintain the latch state.
(c) The IC consumption current is supplied during the off state
under the on/off function to maintain the off state.
However, these are the minimum conditions for using the IC.
The startup time required for the power supply must also be
decided on.
1.1 Connecting the startup resistor before rectification
(AC line)
When the startup resistor is connected before rectification (AC
line) as shown in Figure 18, the voltage applied to the startup
resistor forms a half-wave rectified waveform of the AC input
voltage. Startup resistor R1 must satisfy the three equations
shown below. Select a smaller-side value for R1 in
consideration of the temperature characteristics.
(a) To supply startup current 30A at ON threshold voltage
17.5V (max.) of UVLO:
(b) To supply IC consumption current 80A (max.) (Vcc=10V) in
latch mode:
(c) To supply IC consumption current 200A (max.) (Vcc=17V)
in the off state under the on/off function:
If neither the latch mode operation nor the on/off functions are
used, only the expression in (5) needs to be satisfied. In this
method, the supply current to the IC via the start-up resistor is
stopped when AC input is shut down. Therefore, after latch
mode operation, shutting the AC input down resets the latch
mode in a very short period of time.
...................................................... (5)
2
R1
π
Vac – 17.5
0.03
........................................................ (6)
R1
π
Vac – 10
0.08
2
........................................................ (7)
R1
π
Vac – 17
0.2
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| FA5511P | 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 |
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